diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7617e1f..ff4ced2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,14 +13,12 @@ jobs:
       max-parallel: 7
       matrix:
         python-version:
-        - 3.8
-        - 3.9
         - "3.10"
         - "3.11"
         - "3.12"
         - "3.13"
-        - pypy-3.9
-        - pypy-3.10
+        - "3.14"
+        - pypy-3.11
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.gitignore b/.gitignore
index 7ad0c44..bdcd02d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,7 @@ __pycache__/
 *.egg-info/
 .installed.cfg
 *.egg
+.pdm-python
 
 # Installer logs
 pip-log.txt
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 38d4fcc..b09cdf6 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,11 +1,11 @@
 version: 2
 
 build:
-  os: ubuntu-22.04
+  os: ubuntu-24.04
   apt_packages:
     - graphviz
   tools:
-    python: "3.8"
+    python: "3.10"
 
 sphinx:
   configuration: docs/source/conf.py
diff --git a/docs/source/_examples/myclient.py b/docs/source/_examples/myclient.py
index 1baaf64..8100f45 100644
--- a/docs/source/_examples/myclient.py
+++ b/docs/source/_examples/myclient.py
@@ -1,6 +1,9 @@
-import socket, ssl
+import socket
+import ssl
+
 import h11
 
+
 class MyHttpClient:
     def __init__(self, host, port):
         self.sock = socket.create_connection((host, port))
diff --git a/docs/source/conf.py b/docs/source/conf.py
index b3627f5..eea682f 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -12,7 +12,6 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys
 import os
 
 ################################################################
@@ -30,31 +29,34 @@
 # directory, so there's no single value of this that works for both.)
 #
 import os.path
+import sys
+
 sys._h11_hack_docs_source_path = os.path.dirname(__file__)
 ################################################################
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
+# sys.path.insert(0, os.path.abspath('.'))
 
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
+# needs_sphinx = '1.0'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.viewcode',
-    'sphinx.ext.napoleon',
-    'IPython.sphinxext.ipython_directive',
-    'IPython.sphinxext.ipython_console_highlighting',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.viewcode",
+    "sphinx.ext.napoleon",
+    "IPython.sphinxext.ipython_directive",
+    "IPython.sphinxext.ipython_console_highlighting",
 ]
 
+
 # Undocumented trick: if we def setup here in conf.py, it gets called just
 # like an extension's setup function.
 def setup(app):
@@ -62,24 +64,25 @@ def setup(app):
     app.add_javascript("facebox.js")
     app.add_stylesheet("facebox.css")
 
+
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The encoding of source files.
-#source_encoding = 'utf-8-sig'
+# source_encoding = 'utf-8-sig'
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # General information about the project.
-project = 'h11'
-copyright = '2016, Nathaniel J. Smith'
-author = 'Nathaniel J. Smith'
+project = "h11"
+copyright = "2016, Nathaniel J. Smith"
+author = "Nathaniel J. Smith"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -87,6 +90,7 @@ def setup(app):
 #
 # The short X.Y version.
 import h11
+
 version = h11.__version__
 # The full version, including alpha/beta/rc tags.
 release = h11.__version__
@@ -100,9 +104,9 @@ def setup(app):
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
-#today = ''
+# today = ''
 # Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
+# today_fmt = '%B %d, %Y'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
@@ -111,27 +115,27 @@ def setup(app):
 
 # The reST default role (used for this markup: `text`) to use for all
 # documents.
-#default_role = None
+# default_role = None
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
+# add_function_parentheses = True
 
 # If true, the current module name will be prepended to all description
 # unit titles (such as .. function::).
-#add_module_names = True
+# add_module_names = True
 
 # If true, sectionauthor and moduleauthor directives will be shown in the
 # output. They are ignored by default.
-#show_authors = False
+# show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 # A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
+# modindex_common_prefix = []
 
 # If true, keep warnings as "system message" paragraphs in the built documents.
-#keep_warnings = False
+# keep_warnings = False
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
@@ -146,153 +150,146 @@ def setup(app):
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+# html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
+# html_theme_path = []
 
 # The name for this set of Sphinx documents.
 # "<project> v<release> documentation" by default.
-#html_title = 'h11 v0.0.1'
+# html_title = 'h11 v0.0.1'
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
+# html_short_title = None
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+# html_logo = None
 
 # The name of an image file (relative to this directory) to use as a favicon of
 # the docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-#html_favicon = None
+# html_favicon = None
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
-#html_extra_path = []
+# html_extra_path = []
 
 # If not None, a 'Last updated on:' timestamp is inserted at every page
 # bottom, using the given strftime format.
 # The empty string is equivalent to '%b %d, %Y'.
-#html_last_updated_fmt = None
+# html_last_updated_fmt = None
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
-#html_use_smartypants = True
+# html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
+# html_sidebars = {}
 
 # Additional templates that should be rendered to pages, maps page names to
 # template names.
-#html_additional_pages = {}
+# html_additional_pages = {}
 
 # If false, no module index is generated.
-#html_domain_indices = True
+# html_domain_indices = True
 
 # If false, no index is generated.
-#html_use_index = True
+# html_use_index = True
 
 # If true, the index is split into individual pages for each letter.
-#html_split_index = False
+# html_split_index = False
 
 # If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
+# html_show_sourcelink = True
 
 # If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
+# html_show_sphinx = True
 
 # If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
+# html_show_copyright = True
 
 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the
 # base URL from which the finished HTML is served.
-#html_use_opensearch = ''
+# html_use_opensearch = ''
 
 # This is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = None
+# html_file_suffix = None
 
 # Language to be used for generating the HTML full-text search index.
 # Sphinx supports the following languages:
 #   'da', 'de', 'en', 'es', 'fi', 'fr', 'h', 'it', 'ja'
 #   'nl', 'no', 'pt', 'ro', 'r', 'sv', 'tr', 'zh'
-#html_search_language = 'en'
+# html_search_language = 'en'
 
 # A dictionary with options for the search language support, empty by default.
 # 'ja' uses this config value.
 # 'zh' user can custom change `jieba` dictionary path.
-#html_search_options = {'type': 'default'}
+# html_search_options = {'type': 'default'}
 
 # The name of a javascript file (relative to the configuration directory) that
 # implements a search results scorer. If empty, the default will be used.
-#html_search_scorer = 'scorer.js'
+# html_search_scorer = 'scorer.js'
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'h11doc'
+htmlhelp_basename = "h11doc"
 
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-
-# Latex figure (float) alignment
-#'figure_align': 'htbp',
+    # The paper size ('letterpaper' or 'a4paper').
+    #'papersize': 'letterpaper',
+    # The font size ('10pt', '11pt' or '12pt').
+    #'pointsize': '10pt',
+    # Additional stuff for the LaTeX preamble.
+    #'preamble': '',
+    # Latex figure (float) alignment
+    #'figure_align': 'htbp',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'h11.tex', 'h11 Documentation',
-     'Nathaniel J. Smith', 'manual'),
+    (master_doc, "h11.tex", "h11 Documentation", "Nathaniel J. Smith", "manual"),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
 # the title page.
-#latex_logo = None
+# latex_logo = None
 
 # For "manual" documents, if this is true, then toplevel headings are parts,
 # not chapters.
-#latex_use_parts = False
+# latex_use_parts = False
 
 # If true, show page references after internal links.
-#latex_show_pagerefs = False
+# latex_show_pagerefs = False
 
 # If true, show URL addresses after external links.
-#latex_show_urls = False
+# latex_show_urls = False
 
 # Documents to append as an appendix to all manuals.
-#latex_appendices = []
+# latex_appendices = []
 
 # If false, no module index is generated.
-#latex_domain_indices = True
+# latex_domain_indices = True
 
 
 # -- Options for manual page output ---------------------------------------
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'h11', 'h11 Documentation',
-     [author], 1)
-]
+man_pages = [(master_doc, "h11", "h11 Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
-#man_show_urls = False
+# man_show_urls = False
 
 
 # -- Options for Texinfo output -------------------------------------------
@@ -301,25 +298,31 @@ def setup(app):
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'h11', 'h11 Documentation',
-     author, 'h11', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "h11",
+        "h11 Documentation",
+        author,
+        "h11",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]
 
 # Documents to append as an appendix to all manuals.
-#texinfo_appendices = []
+# texinfo_appendices = []
 
 # If false, no module index is generated.
-#texinfo_domain_indices = True
+# texinfo_domain_indices = True
 
 # How to display URL addresses: 'footnote', 'no', or 'inline'.
-#texinfo_show_urls = 'footnote'
+# texinfo_show_urls = 'footnote'
 
 # If true, do not generate a @detailmenu in the "Top" node's menu.
-#texinfo_no_detailmenu = False
+# texinfo_no_detailmenu = False
 
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/3.5', None),
+    "python": ("https://docs.python.org/3.5", None),
 }
diff --git a/docs/source/make-state-diagrams.py b/docs/source/make-state-diagrams.py
index 617efa5..130da8e 100644
--- a/docs/source/make-state-diagrams.py
+++ b/docs/source/make-state-diagrams.py
@@ -1,6 +1,7 @@
 #!python
 
 import sys
+
 sys.path.append("../..")
 
 import os.path
@@ -9,8 +10,10 @@
 from h11._events import *
 from h11._state import *
 from h11._state import (
-    _SWITCH_UPGRADE, _SWITCH_CONNECT,
-    EVENT_TRIGGERED_TRANSITIONS, STATE_TRIGGERED_TRANSITIONS,
+    _SWITCH_CONNECT,
+    _SWITCH_UPGRADE,
+    EVENT_TRIGGERED_TRANSITIONS,
+    STATE_TRIGGERED_TRANSITIONS,
 )
 
 _EVENT_COLOR = "#002092"
@@ -24,13 +27,15 @@
   edge  [fontname = "Lato"]
 """
 
+
 def finish(machine_name):
-    return ("""
+    return f"""
   labelloc="t"
   labeljust="l"
-  label=<<FONT POINT-SIZE="20">h11 state machine: {}</FONT>>
+  label=<<FONT POINT-SIZE="20">h11 state machine: {machine_name}</FONT>>
 }}
-""".format(machine_name))
+"""
+
 
 class Edges:
     def __init__(self):
@@ -40,19 +45,20 @@ def e(self, source, target, label, color, italicize=False, weight=1):
         if italicize:
             quoted_label = f"<<i>{label}</i>>"
         else:
-            quoted_label = f'<{label}>'
+            quoted_label = f"<{label}>"
         self.edges.append(
-            f'{source} -> {target} [\n'
-            f'  label={quoted_label},\n'
+            f"{source} -> {target} [\n"
+            f"  label={quoted_label},\n"
             f'  color="{color}", fontcolor="{color}",\n'
-            f'  weight={weight},\n'
-            f']\n'
-            )
+            f"  weight={weight},\n"
+            f"]\n"
+        )
 
     def write(self, f):
         self.edges.sort()
         f.write("".join(self.edges))
 
+
 def make_dot_special_state(out_path):
     with open(out_path, "w") as f:
         f.write(HEADER)
@@ -68,29 +74,35 @@ def make_dot_special_state(out_path):
 """)
         edges = Edges()
         for s in ["kaT", "kaF"]:
-            edges.e(s, "kaF",
-                    "Request/response with<br/>HTTP/1.0 or Connection: close",
-                    color=_EVENT_COLOR,
-                    italicize=True)
-
-        edges.e("upF", "upT",
-                "Request with Upgrade:",
-                color=_EVENT_COLOR, italicize=True)
-        edges.e("upT", "upF",
-                "Response",
-                color=_EVENT_COLOR, italicize=True)
-
-        edges.e("coF", "coT",
-                "Request with CONNECT",
-                color=_EVENT_COLOR, italicize=True)
-        edges.e("coT", "coF",
-                "Response without 2xx status",
-                color=_EVENT_COLOR, italicize=True)
+            edges.e(
+                s,
+                "kaF",
+                "Request/response with<br/>HTTP/1.0 or Connection: close",
+                color=_EVENT_COLOR,
+                italicize=True,
+            )
+
+        edges.e(
+            "upF", "upT", "Request with Upgrade:", color=_EVENT_COLOR, italicize=True
+        )
+        edges.e("upT", "upF", "Response", color=_EVENT_COLOR, italicize=True)
+
+        edges.e(
+            "coF", "coT", "Request with CONNECT", color=_EVENT_COLOR, italicize=True
+        )
+        edges.e(
+            "coT",
+            "coF",
+            "Response without 2xx status",
+            color=_EVENT_COLOR,
+            italicize=True,
+        )
 
         edges.write(f)
 
         f.write(finish("special states"))
 
+
 def make_dot(role, out_path):
     with open(out_path, "w") as f:
         f.write(HEADER)
@@ -109,23 +121,21 @@ def make_dot(role, out_path):
         # of the file to fix them.
         edges = Edges()
 
-        CORE_EVENTS = {Request, InformationalResponse,
-                       Response, Data, EndOfMessage}
+        CORE_EVENTS = {Request, InformationalResponse, Response, Data, EndOfMessage}
 
-        for (source_state, t) in EVENT_TRIGGERED_TRANSITIONS[role].items():
-            for (event_type, target_state) in t.items():
+        for source_state, t in EVENT_TRIGGERED_TRANSITIONS[role].items():
+            for event_type, target_state in t.items():
                 weight = 1
                 color = _EVENT_COLOR
                 italicize = False
-                if (event_type in CORE_EVENTS
-                    and source_state is not target_state):
+                if event_type in CORE_EVENTS and source_state is not target_state:
                     weight = 10
                 # exception
-                if (event_type is Response and source_state is IDLE):
+                if event_type is Response and source_state is IDLE:
                     weight = 1
                 if isinstance(event_type, tuple):
                     # The weird special cases
-                    #color = _SPECIAL_COLOR
+                    # color = _SPECIAL_COLOR
                     if event_type == (Request, CLIENT):
                         name = "<i>client makes Request</i>"
                         weight = 10
@@ -139,8 +149,14 @@ def make_dot(role, out_path):
                         assert False
                 else:
                     name = event_type.__name__
-                edges.e(source_state, target_state, name, color,
-                        weight=weight, italicize=italicize)
+                edges.e(
+                    source_state,
+                    target_state,
+                    name,
+                    color,
+                    weight=weight,
+                    italicize=italicize,
+                )
 
         for state_pair, updates in STATE_TRIGGERED_TRANSITIONS.items():
             if role not in updates:
@@ -149,22 +165,32 @@ def make_dot(role, out_path):
                 (our_state, their_state) = state_pair
             else:
                 (their_state, our_state) = state_pair
-            edges.e(our_state, updates[role],
-                    f"<i>peer in</i><BR/>{their_state}",
-                    color=_STATE_COLOR)
+            edges.e(
+                our_state,
+                updates[role],
+                f"<i>peer in</i><BR/>{their_state}",
+                color=_STATE_COLOR,
+            )
 
         if role is CLIENT:
-            edges.e(DONE, MIGHT_SWITCH_PROTOCOL,
-                    "Potential Upgrade:<BR/>or CONNECT pending",
-                    _STATE_COLOR,
-                    italicize=True)
-            edges.e(MIGHT_SWITCH_PROTOCOL, DONE,
-                    "No potential Upgrade:<BR/>or CONNECT pending",
-                    _STATE_COLOR,
-                    italicize=True)
-
-        edges.e(DONE, MUST_CLOSE, "keep-alive<BR/>is disabled", _STATE_COLOR,
-                italicize=True)
+            edges.e(
+                DONE,
+                MIGHT_SWITCH_PROTOCOL,
+                "Potential Upgrade:<BR/>or CONNECT pending",
+                _STATE_COLOR,
+                italicize=True,
+            )
+            edges.e(
+                MIGHT_SWITCH_PROTOCOL,
+                DONE,
+                "No potential Upgrade:<BR/>or CONNECT pending",
+                _STATE_COLOR,
+                italicize=True,
+            )
+
+        edges.e(
+            DONE, MUST_CLOSE, "keep-alive<BR/>is disabled", _STATE_COLOR, italicize=True
+        )
         edges.e(DONE, IDLE, "start_next_cycle()", _SPECIAL_COLOR)
 
         edges.write(f)
@@ -173,6 +199,7 @@ def make_dot(role, out_path):
         # works
         f.write(finish(role))
 
+
 my_dir = os.path.dirname(__file__)
 out_dir = os.path.join(my_dir, "_static")
 if not os.path.exists(out_dir):
diff --git a/examples/trio-server.py b/examples/trio-server.py
index 996afb6..81ad829 100644
--- a/examples/trio-server.py
+++ b/examples/trio-server.py
@@ -260,18 +260,17 @@ async def http_serve(stream):
             wrapper.info("connection is not reusable, so shutting down")
             await wrapper.shutdown_and_clean_up()
             return
-        else:
-            try:
-                wrapper.info("trying to re-use connection")
-                wrapper.conn.start_next_cycle()
-            except h11.ProtocolError:
-                states = wrapper.conn.states
-                wrapper.info("unexpected state", states, "-- bailing out")
-                await maybe_send_error_response(
-                    wrapper, RuntimeError(f"unexpected state {states}")
-                )
-                await wrapper.shutdown_and_clean_up()
-                return
+        try:
+            wrapper.info("trying to re-use connection")
+            wrapper.conn.start_next_cycle()
+        except h11.ProtocolError:
+            states = wrapper.conn.states
+            wrapper.info("unexpected state", states, "-- bailing out")
+            await maybe_send_error_response(
+                wrapper, RuntimeError(f"unexpected state {states}")
+            )
+            await wrapper.shutdown_and_clean_up()
+            return
 
 
 ################################################################
diff --git a/format-requirements.txt b/format-requirements.txt
deleted file mode 100644
index a45e8c9..0000000
--- a/format-requirements.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-black==23.3.0
-isort==5.12.0
\ No newline at end of file
diff --git a/h11/__init__.py b/h11/__init__.py
index 989e92c..34167db 100644
--- a/h11/__init__.py
+++ b/h11/__init__.py
@@ -6,28 +6,30 @@
 # semantics to check that what you're asking to write to the wire is sensible,
 # but at least it gets you out of dealing with the wire itself.
 
-from h11._connection import Connection, NEED_DATA, PAUSED
+# ruff: noqa: I001
+
+from h11._connection import NEED_DATA, PAUSED, Connection
 from h11._events import (
-    ConnectionClosed,
-    Data,
-    EndOfMessage,
-    Event,
-    InformationalResponse,
-    Request,
-    Response,
+    ConnectionClosed as ConnectionClosed,
+    Data as Data,
+    EndOfMessage as EndOfMessage,
+    Event as Event,
+    InformationalResponse as InformationalResponse,
+    Request as Request,
+    Response as Response,
 )
 from h11._state import (
-    CLIENT,
-    CLOSED,
-    DONE,
-    ERROR,
-    IDLE,
-    MIGHT_SWITCH_PROTOCOL,
-    MUST_CLOSE,
-    SEND_BODY,
-    SEND_RESPONSE,
-    SERVER,
-    SWITCHED_PROTOCOL,
+    CLIENT as CLIENT,
+    CLOSED as CLOSED,
+    DONE as DONE,
+    ERROR as ERROR,
+    IDLE as IDLE,
+    MIGHT_SWITCH_PROTOCOL as MIGHT_SWITCH_PROTOCOL,
+    MUST_CLOSE as MUST_CLOSE,
+    SEND_BODY as SEND_BODY,
+    SEND_RESPONSE as SEND_RESPONSE,
+    SERVER as SERVER,
+    SWITCHED_PROTOCOL as SWITCHED_PROTOCOL,
 )
 from h11._util import LocalProtocolError, ProtocolError, RemoteProtocolError
 from h11._version import __version__
@@ -36,27 +38,28 @@
 
 
 __all__ = (
-    "Connection",
-    "NEED_DATA",
-    "PAUSED",
-    "ConnectionClosed",
-    "Data",
-    "EndOfMessage",
-    "Event",
-    "InformationalResponse",
-    "Request",
-    "Response",
     "CLIENT",
     "CLOSED",
     "DONE",
     "ERROR",
     "IDLE",
+    "MIGHT_SWITCH_PROTOCOL",
     "MUST_CLOSE",
+    "NEED_DATA",
+    "PAUSED",
     "SEND_BODY",
     "SEND_RESPONSE",
     "SERVER",
     "SWITCHED_PROTOCOL",
-    "ProtocolError",
+    "Connection",
+    "ConnectionClosed",
+    "Data",
+    "EndOfMessage",
+    "Event",
+    "InformationalResponse",
     "LocalProtocolError",
+    "ProtocolError",
     "RemoteProtocolError",
+    "Request",
+    "Response",
 )
diff --git a/h11/_connection.py b/h11/_connection.py
index e37d82a..77031e4 100644
--- a/h11/_connection.py
+++ b/h11/_connection.py
@@ -1,16 +1,10 @@
 # This contains the main Connection class. Everything in h11 revolves around
 # this.
+from collections.abc import Callable
 from typing import (
     Any,
-    Callable,
     cast,
-    Dict,
-    List,
-    Optional,
     overload,
-    Tuple,
-    Type,
-    Union,
 )
 
 from ._events import (
@@ -29,13 +23,13 @@
     _SWITCH_CONNECT,
     _SWITCH_UPGRADE,
     CLIENT,
-    ConnectionState,
     DONE,
     ERROR,
     MIGHT_SWITCH_PROTOCOL,
     SEND_BODY,
     SERVER,
     SWITCHED_PROTOCOL,
+    ConnectionState,
 )
 from ._util import (  # Import the internal things we need
     LocalProtocolError,
@@ -45,10 +39,10 @@
 from ._writers import WRITERS, WritersType
 
 # Everything in __all__ gets re-exported as part of the h11 public API.
-__all__ = ["Connection", "NEED_DATA", "PAUSED"]
+__all__ = ["NEED_DATA", "PAUSED", "Connection"]
 
 
-class NEED_DATA(Sentinel, metaclass=Sentinel):
+class NEED_DATA(Sentinel, metaclass=Sentinel):  # noqa: N801
     pass
 
 
@@ -81,18 +75,17 @@ class PAUSED(Sentinel, metaclass=Sentinel):
 # our rule is:
 # - If someone says Connection: close, we will close
 # - If someone uses HTTP/1.0, we will close.
-def _keep_alive(event: Union[Request, Response]) -> bool:
+def _keep_alive(event: Request | Response) -> bool:
     connection = get_comma_header(event.headers, b"connection")
     if b"close" in connection:
         return False
-    if getattr(event, "http_version", b"1.1") < b"1.1":
-        return False
-    return True
+
+    return not getattr(event, "http_version", b"1.1") < b"1.1"
 
 
 def _body_framing(
-    request_method: bytes, event: Union[Request, Response]
-) -> Tuple[str, Union[Tuple[()], Tuple[int]]]:
+    request_method: bytes | None, event: Request | Response
+) -> tuple[str, tuple[()] | tuple[int]]:
     # Called when we enter SEND_BODY to figure out framing information for
     # this body.
     #
@@ -137,8 +130,7 @@ def _body_framing(
     # Step 4: no applicable headers; fallback/default depends on type
     if type(event) is Request:
         return ("content-length", (0,))
-    else:
-        return ("http/1.0", ())
+    return ("http/1.0", ())
 
 
 ################################################################
@@ -166,7 +158,7 @@ class Connection:
 
     def __init__(
         self,
-        our_role: Type[Sentinel],
+        our_role: type[Sentinel],
         max_incomplete_event_size: int = DEFAULT_MAX_INCOMPLETE_EVENT_SIZE,
     ) -> None:
         self._max_incomplete_event_size = max_incomplete_event_size
@@ -174,7 +166,7 @@ def __init__(
         if our_role not in (CLIENT, SERVER):
             raise ValueError(f"expected CLIENT or SERVER, not {our_role!r}")
         self.our_role = our_role
-        self.their_role: Type[Sentinel]
+        self.their_role: type[Sentinel]
         if our_role is CLIENT:
             self.their_role = SERVER
         else:
@@ -197,14 +189,14 @@ def __init__(
         # These two are only used to interpret framing headers for figuring
         # out how to read/write response bodies. their_http_version is also
         # made available as a convenient public API.
-        self.their_http_version: Optional[bytes] = None
-        self._request_method: Optional[bytes] = None
+        self.their_http_version: bytes | None = None
+        self._request_method: bytes | None = None
         # This is pure flow-control and doesn't at all affect the set of legal
         # transitions, so no need to bother ConnectionState with it:
         self.client_is_waiting_for_100_continue = False
 
     @property
-    def states(self) -> Dict[Type[Sentinel], Type[Sentinel]]:
+    def states(self) -> dict[type[Sentinel], type[Sentinel]]:
         """A dictionary like::
 
            {CLIENT: <client state>, SERVER: <server state>}
@@ -215,14 +207,14 @@ def states(self) -> Dict[Type[Sentinel], Type[Sentinel]]:
         return dict(self._cstate.states)
 
     @property
-    def our_state(self) -> Type[Sentinel]:
+    def our_state(self) -> type[Sentinel]:
         """The current state of whichever role we are playing. See
         :ref:`state-machine` for details.
         """
         return self._cstate.states[self.our_role]
 
     @property
-    def their_state(self) -> Type[Sentinel]:
+    def their_state(self) -> type[Sentinel]:
         """The current state of whichever role we are NOT playing. See
         :ref:`state-machine` for details.
         """
@@ -252,24 +244,25 @@ def start_next_cycle(self) -> None:
         assert not self.client_is_waiting_for_100_continue
         self._respond_to_state_changes(old_states)
 
-    def _process_error(self, role: Type[Sentinel]) -> None:
+    def _process_error(self, role: type[Sentinel]) -> None:
         old_states = dict(self._cstate.states)
         self._cstate.process_error(role)
         self._respond_to_state_changes(old_states)
 
-    def _server_switch_event(self, event: Event) -> Optional[Type[Sentinel]]:
+    def _server_switch_event(self, event: Event) -> type[Sentinel] | None:
         if type(event) is InformationalResponse and event.status_code == 101:
             return _SWITCH_UPGRADE
-        if type(event) is Response:
-            if (
-                _SWITCH_CONNECT in self._cstate.pending_switch_proposals
-                and 200 <= event.status_code < 300
-            ):
-                return _SWITCH_CONNECT
+
+        if type(event) is Response and (
+            _SWITCH_CONNECT in self._cstate.pending_switch_proposals
+            and 200 <= event.status_code < 300
+        ):
+            return _SWITCH_CONNECT
+
         return None
 
     # All events go through here
-    def _process_event(self, role: Type[Sentinel], event: Event) -> None:
+    def _process_event(self, role: type[Sentinel], event: Event) -> None:
         # First, pass the event through the state machine to make sure it
         # succeeds.
         old_states = dict(self._cstate.states)
@@ -293,7 +286,7 @@ def _process_event(self, role: Type[Sentinel], event: Event) -> None:
             Response,
             InformationalResponse,
         ):
-            event = cast(Union[Request, Response, InformationalResponse], event)
+            event = cast(Request | Response | InformationalResponse, event)
             self.their_http_version = event.http_version
 
         # Keep alive handling
@@ -303,7 +296,7 @@ def _process_event(self, role: Type[Sentinel], event: Event) -> None:
         # this is not supposed to happen. In any case, if it does happen, we
         # ignore it.
         if type(event) in (Request, Response) and not _keep_alive(
-            cast(Union[Request, Response], event)
+            cast(Request | Response, event)
         ):
             self._cstate.process_keep_alive_disabled()
 
@@ -319,30 +312,29 @@ def _process_event(self, role: Type[Sentinel], event: Event) -> None:
 
     def _get_io_object(
         self,
-        role: Type[Sentinel],
-        event: Optional[Event],
-        io_dict: Union[ReadersType, WritersType],
-    ) -> Optional[Callable[..., Any]]:
+        role: type[Sentinel],
+        event: Event | None,
+        io_dict: ReadersType | WritersType,
+    ) -> Callable[..., Any] | None:
         # event may be None; it's only used when entering SEND_BODY
         state = self._cstate.states[role]
         if state is SEND_BODY:
             # Special case: the io_dict has a dict of reader/writer factories
             # that depend on the request/response framing.
             framing_type, args = _body_framing(
-                cast(bytes, self._request_method), cast(Union[Request, Response], event)
+                cast(bytes, self._request_method), cast(Request | Response, event)
             )
             return io_dict[SEND_BODY][framing_type](*args)  # type: ignore[index]
-        else:
-            # General case: the io_dict just has the appropriate reader/writer
-            # for this state
-            return io_dict.get((role, state))  # type: ignore[return-value]
+        # General case: the io_dict just has the appropriate reader/writer
+        # for this state
+        return io_dict.get((role, state))  # type: ignore[return-value]
 
     # This must be called after any action that might have caused
     # self._cstate.states to change.
     def _respond_to_state_changes(
         self,
-        old_states: Dict[Type[Sentinel], Type[Sentinel]],
-        event: Optional[Event] = None,
+        old_states: dict[type[Sentinel], type[Sentinel]],
+        event: Event | None = None,
     ) -> None:
         # Update reader/writer
         if self.our_state != old_states[self.our_role]:
@@ -351,7 +343,7 @@ def _respond_to_state_changes(
             self._reader = self._get_io_object(self.their_role, event, READERS)
 
     @property
-    def trailing_data(self) -> Tuple[bytes, bool]:
+    def trailing_data(self) -> tuple[bytes, bool]:
         """Data that has been received, but not yet processed, represented as
         a tuple with two elements, where the first is a byte-string containing
         the unprocessed data itself, and the second is a bool that is True if
@@ -409,7 +401,7 @@ def receive_data(self, data: bytes) -> None:
 
     def _extract_next_receive_event(
         self,
-    ) -> Union[Event, Type[NEED_DATA], Type[PAUSED]]:
+    ) -> Event | type[NEED_DATA] | type[PAUSED]:
         state = self.their_state
         # We don't pause immediately when they enter DONE, because even in
         # DONE state we can still process a ConnectionClosed() event. But
@@ -421,21 +413,20 @@ def _extract_next_receive_event(
             return PAUSED
         assert self._reader is not None
         event = self._reader(self._receive_buffer)
-        if event is None:
-            if not self._receive_buffer and self._receive_buffer_closed:
-                # In some unusual cases (basically just HTTP/1.0 bodies), EOF
-                # triggers an actual protocol event; in that case, we want to
-                # return that event, and then the state will change and we'll
-                # get called again to generate the actual ConnectionClosed().
-                if hasattr(self._reader, "read_eof"):
-                    event = self._reader.read_eof()
-                else:
-                    event = ConnectionClosed()
+        if event is None and (not self._receive_buffer and self._receive_buffer_closed):
+            # In some unusual cases (basically just HTTP/1.0 bodies), EOF
+            # triggers an actual protocol event; in that case, we want to
+            # return that event, and then the state will change and we'll
+            # get called again to generate the actual ConnectionClosed().
+            if hasattr(self._reader, "read_eof"):
+                event = self._reader.read_eof()
+            else:
+                event = ConnectionClosed()
         if event is None:
             event = NEED_DATA
         return event  # type: ignore[no-any-return]
 
-    def next_event(self) -> Union[Event, Type[NEED_DATA], Type[PAUSED]]:
+    def next_event(self) -> Event | type[NEED_DATA] | type[PAUSED]:
         """Parse the next event out of our receive buffer, update our internal
         state, and return it.
 
@@ -501,20 +492,17 @@ def next_event(self) -> Union[Event, Type[NEED_DATA], Type[PAUSED]]:
                 raise
 
     @overload
-    def send(self, event: ConnectionClosed) -> None:
-        ...
+    def send(self, event: ConnectionClosed) -> None: ...
 
     @overload
     def send(
-        self, event: Union[Request, InformationalResponse, Response, Data, EndOfMessage]
-    ) -> bytes:
-        ...
+        self, event: Request | InformationalResponse | Response | Data | EndOfMessage
+    ) -> bytes: ...
 
     @overload
-    def send(self, event: Event) -> Optional[bytes]:
-        ...
+    def send(self, event: Event) -> bytes | None: ...
 
-    def send(self, event: Event) -> Optional[bytes]:
+    def send(self, event: Event) -> bytes | None:
         """Convert a high-level event into bytes that can be sent to the peer,
         while updating our internal state machine.
 
@@ -538,10 +526,9 @@ def send(self, event: Event) -> Optional[bytes]:
         data_list = self.send_with_data_passthrough(event)
         if data_list is None:
             return None
-        else:
-            return b"".join(data_list)
+        return b"".join(data_list)
 
-    def send_with_data_passthrough(self, event: Event) -> Optional[List[bytes]]:
+    def send_with_data_passthrough(self, event: Event) -> list[bytes] | None:
         """Identical to :meth:`send`, except that in situations where
         :meth:`send` returns a single :term:`bytes-like object`, this instead
         returns a list of them -- and when sending a :class:`Data` event, this
@@ -563,13 +550,12 @@ def send_with_data_passthrough(self, event: Event) -> Optional[List[bytes]]:
             self._process_event(self.our_role, event)
             if type(event) is ConnectionClosed:
                 return None
-            else:
-                # In any situation where writer is None, process_event should
-                # have raised ProtocolError
-                assert writer is not None
-                data_list: List[bytes] = []
-                writer(event, data_list.append)
-                return data_list
+            # In any situation where writer is None, process_event should
+            # have raised ProtocolError
+            assert writer is not None
+            data_list: list[bytes] = []
+            writer(event, data_list.append)
+            return data_list
         except:
             self._process_error(self.our_role)
             raise
diff --git a/h11/_events.py b/h11/_events.py
index ca1c3ad..09fa115 100644
--- a/h11/_events.py
+++ b/h11/_events.py
@@ -8,28 +8,27 @@
 import re
 from abc import ABC
 from dataclasses import dataclass
-from typing import List, Tuple, Union
 
 from ._abnf import method, request_target
 from ._headers import Headers, normalize_and_validate
-from ._util import bytesify, LocalProtocolError, validate
+from ._util import LocalProtocolError, bytesify, validate
 
 # Everything in __all__ gets re-exported as part of the h11 public API.
 __all__ = [
+    "ConnectionClosed",
+    "Data",
+    "EndOfMessage",
     "Event",
-    "Request",
     "InformationalResponse",
+    "Request",
     "Response",
-    "Data",
-    "EndOfMessage",
-    "ConnectionClosed",
 ]
 
 method_re = re.compile(method.encode("ascii"))
 request_target_re = re.compile(request_target.encode("ascii"))
 
 
-class Event(ABC):
+class Event(ABC):  # noqa: B024
     """
     Base class for h11 events.
     """
@@ -72,7 +71,7 @@ class Request(Event):
 
     """
 
-    __slots__ = ("method", "headers", "target", "http_version")
+    __slots__ = ("headers", "http_version", "method", "target")
 
     method: bytes
     headers: Headers
@@ -82,10 +81,10 @@ class Request(Event):
     def __init__(
         self,
         *,
-        method: Union[bytes, str],
-        headers: Union[Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]]],
-        target: Union[bytes, str],
-        http_version: Union[bytes, str] = b"1.1",
+        method: bytes | str,
+        headers: Headers | list[tuple[bytes, bytes]] | list[tuple[str, str]],
+        target: bytes | str,
+        http_version: bytes | str = b"1.1",
         _parsed: bool = False,
     ) -> None:
         super().__init__()
@@ -110,9 +109,10 @@ def __init__(
         # Host header field with an invalid field-value."
         # -- https://tools.ietf.org/html/rfc7230#section-5.4
         host_count = 0
-        for name, value in self.headers:
+        for name, _ in self.headers:
             if name == b"host":
                 host_count += 1
+
         if self.http_version == b"1.1" and host_count == 0:
             raise LocalProtocolError("Missing mandatory Host: header")
         if host_count > 1:
@@ -137,10 +137,10 @@ class _ResponseBase(Event):
     def __init__(
         self,
         *,
-        headers: Union[Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]]],
+        headers: Headers | list[tuple[bytes, bytes]] | list[tuple[str, str]],
         status_code: int,
-        http_version: Union[bytes, str] = b"1.1",
-        reason: Union[bytes, str] = b"",
+        http_version: bytes | str = b"1.1",
+        reason: bytes | str = b"",
         _parsed: bool = False,
     ) -> None:
         super().__init__()
@@ -207,7 +207,7 @@ def __post_init__(self) -> None:
         if not (100 <= self.status_code < 200):
             raise LocalProtocolError(
                 "InformationalResponse status_code should be in range "
-                "[100, 200), not {}".format(self.status_code)
+                f"[100, 200), not {self.status_code}"
             )
 
     # This is an unhashable type.
@@ -247,9 +247,8 @@ class Response(_ResponseBase):
     def __post_init__(self) -> None:
         if not (200 <= self.status_code < 1000):
             raise LocalProtocolError(
-                "Response status_code should be in range [200, 1000), not {}".format(
-                    self.status_code
-                )
+                "Response status_code should be in range [200, 1000), "
+                f"not {self.status_code}"
             )
 
     # This is an unhashable type.
@@ -290,7 +289,7 @@ class Data(Event):
 
     """
 
-    __slots__ = ("data", "chunk_start", "chunk_end")
+    __slots__ = ("chunk_end", "chunk_start", "data")
 
     data: bytes
     chunk_start: bool
@@ -304,7 +303,7 @@ def __init__(
         object.__setattr__(self, "chunk_end", chunk_end)
 
     # This is an unhashable type.
-    __hash__ = None  # type: ignore
+    __hash__ = None
 
 
 # XX FIXME: "A recipient MUST ignore (or consider as an error) any fields that
@@ -337,9 +336,10 @@ class EndOfMessage(Event):
     def __init__(
         self,
         *,
-        headers: Union[
-            Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]], None
-        ] = None,
+        headers: Headers
+        | list[tuple[bytes, bytes]]
+        | list[tuple[str, str]]
+        | None = None,
         _parsed: bool = False,
     ) -> None:
         super().__init__()
@@ -365,5 +365,3 @@ class ConnectionClosed(Event):
 
     No fields.
     """
-
-    pass
diff --git a/h11/_headers.py b/h11/_headers.py
index 31da3e2..2d6e4c6 100644
--- a/h11/_headers.py
+++ b/h11/_headers.py
@@ -1,8 +1,11 @@
+# ruff: noqa: PLW2901
+
 import re
-from typing import AnyStr, cast, List, overload, Sequence, Tuple, TYPE_CHECKING, Union
+from collections.abc import Sequence
+from typing import TYPE_CHECKING, overload
 
 from ._abnf import field_name, field_value
-from ._util import bytesify, LocalProtocolError, validate
+from ._util import LocalProtocolError, bytesify, validate
 
 if TYPE_CHECKING:
     from ._events import Request
@@ -10,7 +13,7 @@
 try:
     from typing import Literal
 except ImportError:
-    from typing_extensions import Literal  # type: ignore
+    from typing import Literal  # type: ignore
 
 CONTENT_LENGTH_MAX_DIGITS = 20  # allow up to 1 billion TB - 1
 
@@ -74,7 +77,7 @@
 _field_value_re = re.compile(field_value.encode("ascii"))
 
 
-class Headers(Sequence[Tuple[bytes, bytes]]):
+class Headers(Sequence[tuple[bytes, bytes]]):
     """
     A list-like interface that allows iterating over headers as byte-pairs
     of (lowercased-name, value).
@@ -99,9 +102,9 @@ class Headers(Sequence[Tuple[bytes, bytes]]):
     ]
     """
 
-    __slots__ = "_full_items"
+    __slots__ = ("_full_items",)
 
-    def __init__(self, full_items: List[Tuple[bytes, bytes, bytes]]) -> None:
+    def __init__(self, full_items: list[tuple[bytes, bytes, bytes]]) -> None:
         self._full_items = full_items
 
     def __bool__(self) -> bool:
@@ -110,52 +113,54 @@ def __bool__(self) -> bool:
     def __eq__(self, other: object) -> bool:
         return list(self) == list(other)  # type: ignore
 
+    def __hash__(self) -> int:
+        return hash(tuple(self._full_items))
+
     def __len__(self) -> int:
         return len(self._full_items)
 
     def __repr__(self) -> str:
-        return "<Headers(%s)>" % repr(list(self))
+        return f"<Headers({list(self)})>"
 
-    def __getitem__(self, idx: int) -> Tuple[bytes, bytes]:  # type: ignore[override]
+    def __getitem__(self, idx: int) -> tuple[bytes, bytes]:  # type: ignore[override]
         _, name, value = self._full_items[idx]
         return (name, value)
 
-    def raw_items(self) -> List[Tuple[bytes, bytes]]:
+    def raw_items(self) -> list[tuple[bytes, bytes]]:
         return [(raw_name, value) for raw_name, _, value in self._full_items]
 
 
-HeaderTypes = Union[
-    List[Tuple[bytes, bytes]],
-    List[Tuple[bytes, str]],
-    List[Tuple[str, bytes]],
-    List[Tuple[str, str]],
-]
+HeaderTypes = (
+    list[tuple[bytes, bytes]]
+    | list[tuple[bytes, str]]
+    | list[tuple[str, bytes]]
+    | list[tuple[str, str]]
+)
 
 
 @overload
-def normalize_and_validate(headers: Headers, _parsed: Literal[True]) -> Headers:
-    ...
+def normalize_and_validate(headers: Headers, _parsed: Literal[True]) -> Headers: ...
 
 
 @overload
-def normalize_and_validate(headers: HeaderTypes, _parsed: Literal[False]) -> Headers:
-    ...
+def normalize_and_validate(
+    headers: HeaderTypes, _parsed: Literal[False]
+) -> Headers: ...
 
 
 @overload
 def normalize_and_validate(
-    headers: Union[Headers, HeaderTypes], _parsed: bool = False
-) -> Headers:
-    ...
+    headers: Headers | HeaderTypes, _parsed: bool = False
+) -> Headers: ...
 
 
 def normalize_and_validate(
-    headers: Union[Headers, HeaderTypes], _parsed: bool = False
+    headers: Headers | HeaderTypes, _parsed: bool = False
 ) -> Headers:
     new_headers = []
     seen_content_length = None
     saw_transfer_encoding = False
-    for name, value in headers:
+    for name, value in headers:  # pyrefly: ignore[bad-assignment]
         # For headers coming out of the parser, we can safely skip some steps,
         # because it always returns bytes and has already run these regexes
         # over the data:
@@ -206,7 +211,7 @@ def normalize_and_validate(
     return Headers(new_headers)
 
 
-def get_comma_header(headers: Headers, name: bytes) -> List[bytes]:
+def get_comma_header(headers: Headers, name: bytes) -> list[bytes]:
     # Should only be used for headers whose value is a list of
     # comma-separated, case-insensitive values.
     #
@@ -242,7 +247,7 @@ def get_comma_header(headers: Headers, name: bytes) -> List[bytes]:
     # Expect: the only legal value is the literal string
     # "100-continue". Splitting on commas is harmless. Case insensitive.
     #
-    out: List[bytes] = []
+    out: list[bytes] = []
     for _, found_name, found_raw_value in headers._full_items:
         if found_name == name:
             found_raw_value = found_raw_value.lower()
@@ -253,7 +258,7 @@ def get_comma_header(headers: Headers, name: bytes) -> List[bytes]:
     return out
 
 
-def set_comma_header(headers: Headers, name: bytes, new_values: List[bytes]) -> Headers:
+def set_comma_header(headers: Headers, name: bytes, new_values: list[bytes]) -> Headers:
     # The header name `name` is expected to be lower-case bytes.
     #
     # Note that when we store the header we use title casing for the header
@@ -263,12 +268,12 @@ def set_comma_header(headers: Headers, name: bytes, new_values: List[bytes]) ->
     # here given the cases where we're using `set_comma_header`...
     #
     # Connection, Content-Length, Transfer-Encoding.
-    new_headers: List[Tuple[bytes, bytes]] = []
+    new_headers: list[tuple[bytes, bytes]] = []
     for found_raw_name, found_name, found_raw_value in headers._full_items:
         if found_name != name:
             new_headers.append((found_raw_name, found_raw_value))
-    for new_value in new_values:
-        new_headers.append((name.title(), new_value))
+
+    new_headers.extend((name.title(), new_value) for new_value in new_values)
     return normalize_and_validate(new_headers)
 
 
diff --git a/h11/_readers.py b/h11/_readers.py
index 576804c..37d71da 100644
--- a/h11/_readers.py
+++ b/h11/_readers.py
@@ -17,7 +17,8 @@
 # - or, for body readers, a dict of per-framing reader factories
 
 import re
-from typing import Any, Callable, Dict, Iterable, NoReturn, Optional, Tuple, Type, Union
+from collections.abc import Callable, Iterable
+from typing import Any, NoReturn
 
 from ._abnf import chunk_header, header_field, request_line, status_line
 from ._events import Data, EndOfMessage, InformationalResponse, Request, Response
@@ -40,9 +41,9 @@
 obs_fold_re = re.compile(rb"[ \t]+")
 
 
-def _obsolete_line_fold(lines: Iterable[bytes]) -> Iterable[bytes]:
+def _obsolete_line_fold(lines: Iterable[bytes | bytearray]) -> Iterable[bytes]:
     it = iter(lines)
-    last: Optional[bytes] = None
+    last: bytearray | None = None
     for line in it:
         match = obs_fold_re.match(line)
         if match:
@@ -55,15 +56,15 @@ def _obsolete_line_fold(lines: Iterable[bytes]) -> Iterable[bytes]:
             last += line[match.end() :]
         else:
             if last is not None:
-                yield last
-            last = line
+                yield bytes(last)
+            last = bytearray(line)
     if last is not None:
-        yield last
+        yield bytes(last)
 
 
 def _decode_header_lines(
-    lines: Iterable[bytes],
-) -> Iterable[Tuple[bytes, bytes]]:
+    lines: Iterable[bytes | bytearray],
+) -> Iterable[tuple[bytes, bytes]]:
     for line in _obsolete_line_fold(lines):
         matches = validate(header_field_re, line, "illegal header line: {!r}", line)
         yield (matches["field_name"], matches["field_value"])
@@ -72,7 +73,7 @@ def _decode_header_lines(
 request_line_re = re.compile(request_line.encode("ascii"))
 
 
-def maybe_read_from_IDLE_client(buf: ReceiveBuffer) -> Optional[Request]:
+def maybe_read_from_IDLE_client(buf: ReceiveBuffer) -> Request | None:  # noqa: N802
     lines = buf.maybe_extract_lines()
     if lines is None:
         if buf.is_next_line_obviously_invalid_request_line():
@@ -91,9 +92,9 @@ def maybe_read_from_IDLE_client(buf: ReceiveBuffer) -> Optional[Request]:
 status_line_re = re.compile(status_line.encode("ascii"))
 
 
-def maybe_read_from_SEND_RESPONSE_server(
+def maybe_read_from_SEND_RESPONSE_server(  # noqa: N802
     buf: ReceiveBuffer,
-) -> Union[InformationalResponse, Response, None]:
+) -> InformationalResponse | Response | None:
     lines = buf.maybe_extract_lines()
     if lines is None:
         if buf.is_next_line_obviously_invalid_request_line():
@@ -107,7 +108,7 @@ def maybe_read_from_SEND_RESPONSE_server(
     )
     reason = b"" if matches["reason"] is None else matches["reason"]
     status_code = int(matches["status_code"])
-    class_: Union[Type[InformationalResponse], Type[Response]] = (
+    class_: type[InformationalResponse | Response] = (
         InformationalResponse if status_code < 200 else Response
     )
     return class_(
@@ -124,21 +125,20 @@ def __init__(self, length: int) -> None:
         self._length = length
         self._remaining = length
 
-    def __call__(self, buf: ReceiveBuffer) -> Union[Data, EndOfMessage, None]:
+    def __call__(self, buf: ReceiveBuffer) -> Data | EndOfMessage | None:
         if self._remaining == 0:
             return EndOfMessage()
         data = buf.maybe_extract_at_most(self._remaining)
         if data is None:
             return None
         self._remaining -= len(data)
-        return Data(data=data)
+        return Data(data=bytes(data))
 
     def read_eof(self) -> NoReturn:
         raise RemoteProtocolError(
             "peer closed connection without sending complete message body "
-            "(received {} bytes, expected {})".format(
-                self._length - self._remaining, self._length
-            )
+            f"(received {self._length - self._remaining} bytes, "
+            f"expected {self._length})"
         )
 
 
@@ -153,7 +153,7 @@ def __init__(self) -> None:
         self._bytes_to_discard = b""
         self._reading_trailer = False
 
-    def __call__(self, buf: ReceiveBuffer) -> Union[Data, EndOfMessage, None]:
+    def __call__(self, buf: ReceiveBuffer) -> Data | EndOfMessage | None:
         if self._reading_trailer:
             lines = buf.maybe_extract_lines()
             if lines is None:
@@ -165,7 +165,8 @@ def __call__(self, buf: ReceiveBuffer) -> Union[Data, EndOfMessage, None]:
                 return None
             if data != self._bytes_to_discard[: len(data)]:
                 raise LocalProtocolError(
-                    f"malformed chunk footer: {data!r} (expected {self._bytes_to_discard!r})"
+                    f"malformed chunk footer: {data!r} "
+                    "(expected {self._bytes_to_discard!r})"
                 )
             self._bytes_to_discard = self._bytes_to_discard[len(data) :]
             if self._bytes_to_discard:
@@ -201,7 +202,7 @@ def __call__(self, buf: ReceiveBuffer) -> Union[Data, EndOfMessage, None]:
             chunk_end = True
         else:
             chunk_end = False
-        return Data(data=data, chunk_start=chunk_start, chunk_end=chunk_end)
+        return Data(data=bytes(data), chunk_start=chunk_start, chunk_end=chunk_end)
 
     def read_eof(self) -> NoReturn:
         raise RemoteProtocolError(
@@ -211,11 +212,11 @@ def read_eof(self) -> NoReturn:
 
 
 class Http10Reader:
-    def __call__(self, buf: ReceiveBuffer) -> Optional[Data]:
+    def __call__(self, buf: ReceiveBuffer) -> Data | None:
         data = buf.maybe_extract_at_most(999999999)
         if data is None:
             return None
-        return Data(data=data)
+        return Data(data=bytes(data))
 
     def read_eof(self) -> EndOfMessage:
         return EndOfMessage()
@@ -224,12 +225,11 @@ def read_eof(self) -> EndOfMessage:
 def expect_nothing(buf: ReceiveBuffer) -> None:
     if buf:
         raise LocalProtocolError("Got data when expecting EOF")
-    return None
 
 
-ReadersType = Dict[
-    Union[Type[Sentinel], Tuple[Type[Sentinel], Type[Sentinel]]],
-    Union[Callable[..., Any], Dict[str, Callable[..., Any]]],
+ReadersType = dict[
+    type[Sentinel] | tuple[type[Sentinel], type[Sentinel]],
+    Callable[..., Any] | dict[str, Callable[..., Any]],
 ]
 
 READERS: ReadersType = {
diff --git a/h11/_receivebuffer.py b/h11/_receivebuffer.py
index e5c4e08..20b8586 100644
--- a/h11/_receivebuffer.py
+++ b/h11/_receivebuffer.py
@@ -1,6 +1,9 @@
 import re
-import sys
-from typing import List, Optional, Union
+
+try:
+    from typing import Self  # pyrefly: ignore
+except ImportError:
+    from typing_extensions import Self
 
 __all__ = ["ReceiveBuffer"]
 
@@ -50,7 +53,7 @@ def __init__(self) -> None:
         self._next_line_search = 0
         self._multiple_lines_search = 0
 
-    def __iadd__(self, byteslike: Union[bytes, bytearray]) -> "ReceiveBuffer":
+    def __iadd__(self, byteslike: bytes | bytearray) -> Self:
         self._data += byteslike
         return self
 
@@ -74,7 +77,7 @@ def _extract(self, count: int) -> bytearray:
 
         return out
 
-    def maybe_extract_at_most(self, count: int) -> Optional[bytearray]:
+    def maybe_extract_at_most(self, count: int) -> bytearray | None:
         """
         Extract a fixed number of bytes from the buffer.
         """
@@ -84,7 +87,7 @@ def maybe_extract_at_most(self, count: int) -> Optional[bytearray]:
 
         return self._extract(count)
 
-    def maybe_extract_next_line(self) -> Optional[bytearray]:
+    def maybe_extract_next_line(self) -> bytearray | None:
         """
         Extract the first line, if it is completed in the buffer.
         """
@@ -101,7 +104,7 @@ def maybe_extract_next_line(self) -> Optional[bytearray]:
 
         return self._extract(idx)
 
-    def maybe_extract_lines(self) -> Optional[List[bytearray]]:
+    def maybe_extract_lines(self) -> list[bytearray] | None:
         """
         Extract everything up to the first blank line, and return a list of lines.
         """
diff --git a/h11/_state.py b/h11/_state.py
index 3ad444b..f80dc89 100644
--- a/h11/_state.py
+++ b/h11/_state.py
@@ -110,24 +110,35 @@
 # tables. But it can't automatically read the transitions that are written
 # directly in Python code. So if you touch those, you need to also update the
 # script to keep it in sync!
-from typing import cast, Dict, Optional, Set, Tuple, Type, Union
 
-from ._events import *
+# ruff: noqa: N801
+
+from typing import cast
+
+from ._events import (
+    ConnectionClosed,
+    Data,
+    EndOfMessage,
+    Event,
+    InformationalResponse,
+    Request,
+    Response,
+)
 from ._util import LocalProtocolError, Sentinel
 
 # Everything in __all__ gets re-exported as part of the h11 public API.
 __all__ = [
     "CLIENT",
-    "SERVER",
-    "IDLE",
-    "SEND_RESPONSE",
-    "SEND_BODY",
-    "DONE",
-    "MUST_CLOSE",
     "CLOSED",
+    "DONE",
+    "ERROR",
+    "IDLE",
     "MIGHT_SWITCH_PROTOCOL",
+    "MUST_CLOSE",
+    "SEND_BODY",
+    "SEND_RESPONSE",
+    "SERVER",
     "SWITCHED_PROTOCOL",
-    "ERROR",
 ]
 
 
@@ -185,11 +196,11 @@ class _SWITCH_CONNECT(Sentinel, metaclass=Sentinel):
     pass
 
 
-EventTransitionType = Dict[
-    Type[Sentinel],
-    Dict[
-        Type[Sentinel],
-        Dict[Union[Type[Event], Tuple[Type[Event], Type[Sentinel]]], Type[Sentinel]],
+EventTransitionType = dict[
+    type[Sentinel],
+    dict[
+        type[Sentinel],
+        dict[type[Event] | tuple[type[Event], type[Sentinel]], type[Sentinel]],
     ],
 ]
 
@@ -226,8 +237,8 @@ class _SWITCH_CONNECT(Sentinel, metaclass=Sentinel):
     },
 }
 
-StateTransitionType = Dict[
-    Tuple[Type[Sentinel], Type[Sentinel]], Dict[Type[Sentinel], Type[Sentinel]]
+StateTransitionType = dict[
+    tuple[type[Sentinel], type[Sentinel]], dict[type[Sentinel], type[Sentinel]]
 ]
 
 # NB: there are also some special-case state-triggered transitions hard-coded
@@ -256,11 +267,11 @@ def __init__(self) -> None:
 
         # This is a subset of {UPGRADE, CONNECT}, containing the proposals
         # made by the client for switching protocols.
-        self.pending_switch_proposals: Set[Type[Sentinel]] = set()
+        self.pending_switch_proposals: set[type[Sentinel]] = set()
 
-        self.states: Dict[Type[Sentinel], Type[Sentinel]] = {CLIENT: IDLE, SERVER: IDLE}
+        self.states: dict[type[Sentinel], type[Sentinel]] = {CLIENT: IDLE, SERVER: IDLE}
 
-    def process_error(self, role: Type[Sentinel]) -> None:
+    def process_error(self, role: type[Sentinel]) -> None:
         self.states[role] = ERROR
         self._fire_state_triggered_transitions()
 
@@ -268,17 +279,17 @@ def process_keep_alive_disabled(self) -> None:
         self.keep_alive = False
         self._fire_state_triggered_transitions()
 
-    def process_client_switch_proposal(self, switch_event: Type[Sentinel]) -> None:
+    def process_client_switch_proposal(self, switch_event: type[Sentinel]) -> None:
         self.pending_switch_proposals.add(switch_event)
         self._fire_state_triggered_transitions()
 
     def process_event(
         self,
-        role: Type[Sentinel],
-        event_type: Type[Event],
-        server_switch_event: Optional[Type[Sentinel]] = None,
+        role: type[Sentinel],
+        event_type: type[Event],
+        server_switch_event: type[Sentinel] | None = None,
     ) -> None:
-        _event_type: Union[Type[Event], Tuple[Type[Event], Type[Sentinel]]] = event_type
+        _event_type: type[Event] | tuple[type[Event], type[Sentinel]] = event_type
         if server_switch_event is not None:
             assert role is SERVER
             if server_switch_event not in self.pending_switch_proposals:
@@ -298,18 +309,17 @@ def process_event(
 
     def _fire_event_triggered_transitions(
         self,
-        role: Type[Sentinel],
-        event_type: Union[Type[Event], Tuple[Type[Event], Type[Sentinel]]],
+        role: type[Sentinel],
+        event_type: type[Event] | tuple[type[Event], type[Sentinel]],
     ) -> None:
         state = self.states[role]
         try:
             new_state = EVENT_TRIGGERED_TRANSITIONS[role][state][event_type]
         except KeyError:
-            event_type = cast(Type[Event], event_type)
+            event_type = cast(type[Event], event_type)
             raise LocalProtocolError(
-                "can't handle event type {} when role={} and state={}".format(
-                    event_type.__name__, role, self.states[role]
-                )
+                f"can't handle event type {event_type.__name__} when role={role} "
+                "and state={self.states[role]}"
             ) from None
         self.states[role] = new_state
 
@@ -331,13 +341,14 @@ def _fire_state_triggered_transitions(self) -> None:
             # they close the connection, or else the server will deny the
             # request, in which case the client will go back to DONE and then
             # from there to MUST_CLOSE.
-            if self.pending_switch_proposals:
-                if self.states[CLIENT] is DONE:
-                    self.states[CLIENT] = MIGHT_SWITCH_PROTOCOL
-
-            if not self.pending_switch_proposals:
-                if self.states[CLIENT] is MIGHT_SWITCH_PROTOCOL:
-                    self.states[CLIENT] = DONE
+            if self.pending_switch_proposals and self.states[CLIENT] is DONE:
+                self.states[CLIENT] = MIGHT_SWITCH_PROTOCOL
+
+            if (
+                not self.pending_switch_proposals
+                and self.states[CLIENT] is MIGHT_SWITCH_PROTOCOL
+            ):
+                self.states[CLIENT] = DONE
 
             if not self.keep_alive:
                 for role in (CLIENT, SERVER):
diff --git a/h11/_util.py b/h11/_util.py
index 6718445..85d272a 100644
--- a/h11/_util.py
+++ b/h11/_util.py
@@ -1,11 +1,12 @@
-from typing import Any, Dict, NoReturn, Pattern, Tuple, Type, TypeVar, Union
+from re import Pattern
+from typing import Any, NoReturn, TypeVar
 
 __all__ = [
-    "ProtocolError",
     "LocalProtocolError",
+    "ProtocolError",
     "RemoteProtocolError",
-    "validate",
     "bytesify",
+    "validate",
 ]
 
 
@@ -82,8 +83,11 @@ class RemoteProtocolError(ProtocolError):
 
 
 def validate(
-    regex: Pattern[bytes], data: bytes, msg: str = "malformed data", *format_args: Any
-) -> Dict[str, bytes]:
+    regex: Pattern[bytes],
+    data: bytes | bytearray,
+    msg: str = "malformed data",
+    *format_args: Any,
+) -> dict[str, bytes]:
     match = regex.fullmatch(data)
     if not match:
         if format_args:
@@ -106,25 +110,25 @@ def validate(
 
 class Sentinel(type):
     def __new__(
-        cls: Type[_T_Sentinel],
+        cls: type[_T_Sentinel],
         name: str,
-        bases: Tuple[type, ...],
-        namespace: Dict[str, Any],
-        **kwds: Any
+        bases: tuple[type, ...],
+        namespace: dict[str, Any],
+        **kwds: Any,
     ) -> _T_Sentinel:
         assert bases == (Sentinel,)
         v = super().__new__(cls, name, bases, namespace, **kwds)
         v.__class__ = v  # type: ignore
         return v
 
-    def __repr__(self) -> str:
-        return self.__name__
+    def __repr__(cls) -> str:
+        return cls.__name__
 
 
 # Used for methods, request targets, HTTP versions, header names, and header
 # values. Accepts ascii-strings, or bytes/bytearray/memoryview/..., and always
 # returns bytes.
-def bytesify(s: Union[bytes, bytearray, memoryview, int, str]) -> bytes:
+def bytesify(s: bytes | bytearray | memoryview | int | str) -> bytes:
     # Fast-path:
     if type(s) is bytes:
         return s
diff --git a/h11/_writers.py b/h11/_writers.py
index 939cdb9..ac28f54 100644
--- a/h11/_writers.py
+++ b/h11/_writers.py
@@ -7,7 +7,8 @@
 # - a writer
 # - or, for body writers, a dict of framin-dependent writer factories
 
-from typing import Any, Callable, Dict, List, Tuple, Type, Union
+from collections.abc import Callable
+from typing import Any
 
 from ._events import Data, EndOfMessage, Event, InformationalResponse, Request, Response
 from ._headers import Headers
@@ -42,7 +43,7 @@ def write_request(request: Request, write: Writer) -> None:
 
 # Shared between InformationalResponse and Response
 def write_any_response(
-    response: Union[InformationalResponse, Response], write: Writer
+    response: InformationalResponse | Response, write: Writer
 ) -> None:
     if response.http_version != b"1.1":
         raise LocalProtocolError("I only send HTTP/1.1")
@@ -66,7 +67,7 @@ def __call__(self, event: Event, write: Writer) -> None:
         elif type(event) is EndOfMessage:
             self.send_eom(event.headers, write)
         else:  # pragma: no cover
-            assert False
+            raise AssertionError
 
     def send_data(self, data: bytes, write: Writer) -> None:
         pass
@@ -91,7 +92,7 @@ def send_data(self, data: bytes, write: Writer) -> None:
             raise LocalProtocolError("Too much data for declared Content-Length")
         write(data)
 
-    def send_eom(self, headers: Headers, write: Writer) -> None:
+    def send_eom(self, headers: Headers, write: Writer) -> None:  # noqa: ARG002
         if self._length != 0:
             raise LocalProtocolError("Too little data for declared Content-Length")
         if headers:
@@ -117,20 +118,18 @@ class Http10Writer(BodyWriter):
     def send_data(self, data: bytes, write: Writer) -> None:
         write(data)
 
-    def send_eom(self, headers: Headers, write: Writer) -> None:
+    def send_eom(self, headers: Headers, write: Writer) -> None:  # noqa: ARG002
         if headers:
             raise LocalProtocolError("can't send trailers to HTTP/1.0 client")
         # no need to close the socket ourselves, that will be taken care of by
         # Connection: close machinery
 
 
-WritersType = Dict[
-    Union[Tuple[Type[Sentinel], Type[Sentinel]], Type[Sentinel]],
-    Union[
-        Dict[str, Type[BodyWriter]],
-        Callable[[Union[InformationalResponse, Response], Writer], None],
-        Callable[[Request, Writer], None],
-    ],
+WritersType = dict[
+    tuple[type[Sentinel], type[Sentinel]] | type[Sentinel],
+    dict[str, type[BodyWriter]]
+    | Callable[[InformationalResponse | Response, Writer], None]
+    | Callable[[Request, Writer], None],
 ]
 
 WRITERS: WritersType = {
diff --git a/h11/tests/helpers.py b/h11/tests/helpers.py
index 571be44..04c80ac 100644
--- a/h11/tests/helpers.py
+++ b/h11/tests/helpers.py
@@ -1,25 +1,21 @@
-from typing import cast, List, Type, Union, ValuesView
+from collections.abc import ValuesView
+from typing import cast
 
-from .._connection import Connection, NEED_DATA, PAUSED
+from .._connection import NEED_DATA, PAUSED, Connection
 from .._events import (
     ConnectionClosed,
     Data,
-    EndOfMessage,
     Event,
-    InformationalResponse,
-    Request,
-    Response,
 )
-from .._state import CLIENT, CLOSED, DONE, MUST_CLOSE, SERVER
-from .._util import Sentinel
+from .._state import CLIENT, SERVER
 
 try:
     from typing import Literal
 except ImportError:
-    from typing_extensions import Literal  # type: ignore
+    from typing import Literal  # type: ignore
 
 
-def get_all_events(conn: Connection) -> List[Event]:
+def get_all_events(conn: Connection) -> list[Event]:
     got_events = []
     while True:
         event = conn.next_event()
@@ -32,23 +28,23 @@ def get_all_events(conn: Connection) -> List[Event]:
     return got_events
 
 
-def receive_and_get(conn: Connection, data: bytes) -> List[Event]:
+def receive_and_get(conn: Connection, data: bytes) -> list[Event]:
     conn.receive_data(data)
     return get_all_events(conn)
 
 
 # Merges adjacent Data events, converts payloads to bytestrings, and removes
 # chunk boundaries.
-def normalize_data_events(in_events: List[Event]) -> List[Event]:
-    out_events: List[Event] = []
+def normalize_data_events(in_events: list[Event]) -> list[Event]:
+    out_events: list[Event] = []
     for event in in_events:
         if type(event) is Data:
-            event = Data(data=bytes(event.data), chunk_start=False, chunk_end=False)
+            event = Data(data=bytes(event.data), chunk_start=False, chunk_end=False)  # noqa: PLW2901
         if out_events and type(out_events[-1]) is type(event) is Data:
             out_events[-1] = Data(
-                data=out_events[-1].data + event.data,
-                chunk_start=out_events[-1].chunk_start,
-                chunk_end=out_events[-1].chunk_end,
+                data=out_events[-1].data + event.data,  # type: ignore
+                chunk_start=out_events[-1].chunk_start,  # type: ignore
+                chunk_end=out_events[-1].chunk_end,  # type: ignore
             )
         else:
             out_events.append(event)
@@ -71,9 +67,9 @@ def conns(self) -> ValuesView[Connection]:
     # expect="match" if expect=send_events; expect=[...] to say what expected
     def send(
         self,
-        role: Type[Sentinel],
-        send_events: Union[List[Event], Event],
-        expect: Union[List[Event], Event, Literal["match"]] = "match",
+        role: type[CLIENT] | type[SERVER],
+        send_events: list[Event] | Event,
+        expect: list[Event] | Event | Literal["match"] = "match",
     ) -> bytes:
         if not isinstance(send_events, list):
             send_events = [send_events]
diff --git a/h11/tests/test_against_stdlib_http.py b/h11/tests/test_against_stdlib_http.py
index 3f66a10..5c7e438 100644
--- a/h11/tests/test_against_stdlib_http.py
+++ b/h11/tests/test_against_stdlib_http.py
@@ -1,11 +1,13 @@
+# ruff: noqa: T201, S310
+
 import json
 import os.path
 import socket
 import socketserver
 import threading
+from collections.abc import Callable, Generator
 from contextlib import closing, contextmanager
 from http.server import SimpleHTTPRequestHandler
-from typing import Callable, Generator
 from urllib.request import urlopen
 
 import h11
@@ -33,40 +35,42 @@ def socket_server(
 
 
 class SingleMindedRequestHandler(SimpleHTTPRequestHandler):
-    def translate_path(self, path: str) -> str:
+    def translate_path(self, path: str) -> str:  # noqa: ARG002
         return test_file_path
 
 
 def test_h11_as_client() -> None:
-    with socket_server(SingleMindedRequestHandler) as httpd:
-        with closing(socket.create_connection(httpd.server_address)) as s:  # type: ignore[arg-type]
-            c = h11.Connection(h11.CLIENT)
-
-            s.sendall(
-                c.send(
-                    h11.Request(
-                        method="GET", target="/foo", headers=[("Host", "localhost")]
-                    )
+    with (
+        socket_server(SingleMindedRequestHandler) as httpd,
+        closing(socket.create_connection(httpd.server_address)) as s,  # type: ignore
+    ):
+        c = h11.Connection(h11.CLIENT)
+
+        s.sendall(
+            c.send(
+                h11.Request(
+                    method="GET", target="/foo", headers=[("Host", "localhost")]
                 )
             )
-            s.sendall(c.send(h11.EndOfMessage()))
+        )
+        s.sendall(c.send(h11.EndOfMessage()))
 
-            data = bytearray()
-            while True:
-                event = c.next_event()
-                print(event)
-                if event is h11.NEED_DATA:
-                    # Use a small read buffer to make things more challenging
-                    # and exercise more paths :-)
-                    c.receive_data(s.recv(10))
-                    continue
-                if type(event) is h11.Response:
-                    assert event.status_code == 200
-                if type(event) is h11.Data:
-                    data += event.data
-                if type(event) is h11.EndOfMessage:
-                    break
-            assert bytes(data) == test_file_data
+        data = bytearray()
+        while True:
+            event = c.next_event()
+            print(event)
+            if event is h11.NEED_DATA:
+                # Use a small read buffer to make things more challenging
+                # and exercise more paths :-)
+                c.receive_data(s.recv(10))
+                continue
+            if type(event) is h11.Response:
+                assert event.status_code == 200
+            if type(event) is h11.Data:
+                data += event.data
+            if type(event) is h11.EndOfMessage:
+                break
+        assert bytes(data) == test_file_data
 
 
 class H11RequestHandler(socketserver.BaseRequestHandler):
@@ -103,7 +107,7 @@ def handle(self) -> None:
 
 def test_h11_as_server() -> None:
     with socket_server(H11RequestHandler) as httpd:
-        host, port = httpd.server_address
+        host, port = httpd.server_address  # type: ignore
         url = f"http://{host}:{port}/some-path"  # type: ignore[str-bytes-safe]
         with closing(urlopen(url)) as f:
             assert f.getcode() == 200
diff --git a/h11/tests/test_connection.py b/h11/tests/test_connection.py
index 01260dc..0171218 100644
--- a/h11/tests/test_connection.py
+++ b/h11/tests/test_connection.py
@@ -1,12 +1,15 @@
-from typing import Any, cast, Dict, List, Optional, Tuple, Type
+# ruff: noqa: N802, T201
+
+from typing import Any, cast
 
 import pytest
 
-from .._connection import _body_framing, _keep_alive, Connection, NEED_DATA, PAUSED
+from .._connection import NEED_DATA, PAUSED, Connection, _body_framing, _keep_alive
 from .._events import (
     ConnectionClosed,
     Data,
     EndOfMessage,
+    Event,
     InformationalResponse,
     Request,
     Response,
@@ -58,27 +61,27 @@ def test__keep_alive() -> None:
 
 
 def test__body_framing() -> None:
-    def headers(cl: Optional[int], te: bool) -> List[Tuple[str, str]]:
+    def headers(cl: int | None, te: bool) -> list[tuple[str, str]]:
         headers = []
         if cl is not None:
             headers.append(("Content-Length", str(cl)))
         if te:
             headers.append(("Transfer-Encoding", "chunked"))
-        return headers
+        return headers  # type: ignore
 
     def resp(
-        status_code: int = 200, cl: Optional[int] = None, te: bool = False
+        status_code: int = 200, cl: int | None = None, te: bool = False
     ) -> Response:
         return Response(status_code=status_code, headers=headers(cl, te))
 
-    def req(cl: Optional[int] = None, te: bool = False) -> Request:
+    def req(cl: int | None = None, te: bool = False) -> Request:
         h = headers(cl, te)
         h += [("Host", "example.com")]
         return Request(method="GET", target="/", headers=h)
 
     # Special cases where the headers are ignored:
     for kwargs in [{}, {"cl": 100}, {"te": True}, {"cl": 100, "te": True}]:
-        kwargs = cast(Dict[str, Any], kwargs)
+        kwargs = cast(dict[str, Any], kwargs)
         for meth, r in [
             (b"HEAD", resp(**kwargs)),
             (b"GET", resp(status_code=204, **kwargs)),
@@ -88,7 +91,7 @@ def req(cl: Optional[int] = None, te: bool = False) -> Request:
 
     # Transfer-encoding
     for kwargs in [{"te": True}, {"cl": 100, "te": True}]:
-        kwargs = cast(Dict[str, Any], kwargs)
+        kwargs = cast(dict[str, Any], kwargs)
         for meth, r in [(None, req(**kwargs)), (b"GET", resp(**kwargs))]:  # type: ignore
             assert _body_framing(meth, r) == ("chunked", ())
 
@@ -102,7 +105,7 @@ def req(cl: Optional[int] = None, te: bool = False) -> Request:
 
 
 def test_Connection_basics_and_content_length() -> None:
-    with pytest.raises(ValueError):
+    with pytest.raises(ValueError):  # noqa: PT011
         Connection("CLIENT")  # type: ignore
 
     p = ConnectionPair()
@@ -120,7 +123,7 @@ def test_Connection_basics_and_content_length() -> None:
         ),
     )
     assert data == (
-        b"GET / HTTP/1.1\r\n" b"Host: example.com\r\n" b"Content-Length: 10\r\n\r\n"
+        b"GET / HTTP/1.1\r\nHost: example.com\r\nContent-Length: 10\r\n\r\n"
     )
 
     for conn in p.conns:
@@ -203,10 +206,7 @@ def test_chunk_boundaries() -> None:
     conn = Connection(our_role=SERVER)
 
     request = (
-        b"POST / HTTP/1.1\r\n"
-        b"Host: example.com\r\n"
-        b"Transfer-Encoding: chunked\r\n"
-        b"\r\n"
+        b"POST / HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: chunked\r\n\r\n"
     )
     conn.receive_data(request)
     assert conn.next_event() == Request(
@@ -303,7 +303,7 @@ def test_automatic_transfer_encoding_in_response() -> None:
         # because if both are set then Transfer-Encoding wins
         [("Transfer-Encoding", "chunked"), ("Content-Length", "100")],
     ]:
-        user_headers = cast(List[Tuple[str, str]], user_headers)
+        user_headers = cast(list[tuple[str, str]], user_headers)
         p = ConnectionPair()
         p.send(
             CLIENT,
@@ -415,7 +415,7 @@ def test_max_incomplete_event_size_countermeasure() -> None:
     c = Connection(SERVER)
     c.receive_data(b"GET / HTTP/1.0\r\nEndless: ")
     assert c.next_event() is NEED_DATA
-    with pytest.raises(RemoteProtocolError):
+    with pytest.raises(RemoteProtocolError):  # noqa: PT012
         while True:
             c.receive_data(b"a" * 1024)
             c.next_event()
@@ -635,7 +635,7 @@ def test_protocol_switch() -> None:
 
         def setup() -> ConnectionPair:
             p = ConnectionPair()
-            p.send(CLIENT, req)
+            p.send(CLIENT, req)  # noqa: B023
             # No switch-related state change stuff yet; the client has to
             # finish the request before that kicks in
             for conn in p.conns:
@@ -720,14 +720,14 @@ def test_close_simple() -> None:
     # Just immediately closing a new connection without anything having
     # happened yet.
     for who_shot_first, who_shot_second in [(CLIENT, SERVER), (SERVER, CLIENT)]:
-
+        # all these noqas are fine bc the function is immediately called
         def setup() -> ConnectionPair:
             p = ConnectionPair()
-            p.send(who_shot_first, ConnectionClosed())
+            p.send(who_shot_first, ConnectionClosed())  # noqa: B023
             for conn in p.conns:
                 assert conn.states == {
-                    who_shot_first: CLOSED,
-                    who_shot_second: MUST_CLOSE,
+                    who_shot_first: CLOSED,  # noqa: B023
+                    who_shot_second: MUST_CLOSE,  # noqa: B023
                 }
             return p
 
@@ -758,11 +758,11 @@ def setup() -> ConnectionPair:
 
 
 def test_close_different_states() -> None:
-    req = [
+    req: list[Event] = [
         Request(method="GET", target="/foo", headers=[("Host", "a")]),
         EndOfMessage(),
     ]
-    resp = [
+    resp: list[Event] = [
         Response(status_code=200, headers=[(b"transfer-encoding", b"chunked")]),
         EndOfMessage(),
     ]
@@ -873,8 +873,8 @@ def __len__(self) -> int:
     placeholder = SendfilePlaceholder()
 
     def setup(
-        header: Tuple[str, str], http_version: str
-    ) -> Tuple[Connection, Optional[List[bytes]]]:
+        header: tuple[str, str], http_version: str
+    ) -> tuple[Connection, list[bytes] | None]:
         c = Connection(SERVER)
         receive_and_get(
             c, f"GET / HTTP/{http_version}\r\nHost: a\r\n\r\n".encode("ascii")
@@ -924,7 +924,7 @@ def test_errors() -> None:
     # After an error sending, you can no longer send
     # (This is especially important for things like content-length errors,
     # where there's complex internal state being modified)
-    def conn(role: Type[Sentinel]) -> Connection:
+    def conn(role: type[Sentinel]) -> Connection:
         c = Connection(our_role=role)
         if role is SERVER:
             # Put it into the state where it *could* send a response...
@@ -948,17 +948,17 @@ def conn(role: Type[Sentinel]) -> Connection:
             bad = Response(status_code=200, headers=[], http_version="1.0")  # type: ignore[assignment]
         # Make sure 'good' actually is good
         c = conn(role)
-        c.send(good)
+        c.send(good)  # pyrefly: ignore[unbound-name]
         assert c.our_state is not ERROR
         # Do that again, but this time sending 'bad' first
         c = conn(role)
         with pytest.raises(LocalProtocolError):
-            c.send(bad)
+            c.send(bad)  # pyrefly: ignore[unbound-name]
         assert c.our_state is ERROR
         assert c.their_state is not ERROR
         # Now 'good' is not so good
         with pytest.raises(LocalProtocolError):
-            c.send(good)
+            c.send(good)  # pyrefly: ignore[unbound-name]
 
         # And check send_failed() too
         c = conn(role)
@@ -1092,7 +1092,7 @@ def setup(method: bytes, http_version: bytes) -> Connection:
 def test_special_exceptions_for_lost_connection_in_message_body() -> None:
     c = Connection(SERVER)
     c.receive_data(
-        b"POST / HTTP/1.1\r\n" b"Host: example.com\r\n" b"Content-Length: 100\r\n\r\n"
+        b"POST / HTTP/1.1\r\nHost: example.com\r\nContent-Length: 100\r\n\r\n"
     )
     assert type(c.next_event()) is Request
     assert c.next_event() is NEED_DATA
@@ -1106,9 +1106,7 @@ def test_special_exceptions_for_lost_connection_in_message_body() -> None:
 
     c = Connection(SERVER)
     c.receive_data(
-        b"POST / HTTP/1.1\r\n"
-        b"Host: example.com\r\n"
-        b"Transfer-Encoding: chunked\r\n\r\n"
+        b"POST / HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: chunked\r\n\r\n"
     )
     assert type(c.next_event()) is Request
     assert c.next_event() is NEED_DATA
diff --git a/h11/tests/test_events.py b/h11/tests/test_events.py
index d691545..368e7a8 100644
--- a/h11/tests/test_events.py
+++ b/h11/tests/test_events.py
@@ -79,14 +79,17 @@ def test_events() -> None:
         target.append(bad_byte)
         with pytest.raises(LocalProtocolError):
             Request(
-                method="GET", target=target, headers=[("Host", "a")], http_version="1.1"
+                method="GET",
+                target=bytes(target),
+                headers=[("Host", "a")],
+                http_version="1.1",
             )
 
     # Request method is validated
     with pytest.raises(LocalProtocolError):
         Request(
             method="GET / HTTP/1.1",
-            target=target,
+            target=bytes(target),  # type: ignore[unbound-name]
             headers=[("Host", "a")],
             http_version="1.1",
         )
diff --git a/h11/tests/test_headers.py b/h11/tests/test_headers.py
index b57274c..f2884d2 100644
--- a/h11/tests/test_headers.py
+++ b/h11/tests/test_headers.py
@@ -4,7 +4,6 @@
 from .._headers import (
     get_comma_header,
     has_expect_100_continue,
-    Headers,
     normalize_and_validate,
     set_comma_header,
 )
diff --git a/h11/tests/test_helpers.py b/h11/tests/test_helpers.py
index 9a30dc6..fa18624 100644
--- a/h11/tests/test_helpers.py
+++ b/h11/tests/test_helpers.py
@@ -5,7 +5,7 @@
 def test_normalize_data_events() -> None:
     assert normalize_data_events(
         [
-            Data(data=bytearray(b"1")),
+            Data(data=bytearray(b"1")),  # type: ignore[bad-argument-type]
             Data(data=b"2"),
             Response(status_code=200, headers=[]),
             Data(data=b"3"),
diff --git a/h11/tests/test_io.py b/h11/tests/test_io.py
index 407e044..2849ee4 100644
--- a/h11/tests/test_io.py
+++ b/h11/tests/test_io.py
@@ -1,4 +1,7 @@
-from typing import Any, Callable, Generator, List
+# ruff: noqa: T201, N802
+
+from collections.abc import Callable, Generator
+from typing import Any
 
 import pytest
 
@@ -12,23 +15,23 @@
 )
 from .._headers import Headers, normalize_and_validate
 from .._readers import (
-    _obsolete_line_fold,
+    READERS,
     ChunkedReader,
     ContentLengthReader,
     Http10Reader,
-    READERS,
+    _obsolete_line_fold,
 )
 from .._receivebuffer import ReceiveBuffer
 from .._state import CLIENT, IDLE, SEND_RESPONSE, SERVER
 from .._util import LocalProtocolError
 from .._writers import (
+    WRITERS,
     ChunkedWriter,
     ContentLengthWriter,
     Http10Writer,
     write_any_response,
     write_headers,
     write_request,
-    WRITERS,
 )
 from .helpers import normalize_data_events
 
@@ -68,7 +71,7 @@
 
 
 def dowrite(writer: Callable[..., None], obj: Any) -> bytes:
-    got_list: List[bytes] = []
+    got_list: list[bytes] = []
     writer(obj, got_list.append)
     return b"".join(got_list)
 
@@ -188,7 +191,7 @@ def test_readers_unusual() -> None:
     # 7230 -- this is a bug in the standard that we originally copied...)
     tr(
         READERS[SERVER, SEND_RESPONSE],
-        b"HTTP/1.0 200 OK\r\n" b"Foo: a a a a a \r\n\r\n",
+        b"HTTP/1.0 200 OK\r\nFoo: a a a a a \r\n\r\n",
         Response(
             status_code=200,
             headers=[("Foo", "a a a a a")],
@@ -200,7 +203,7 @@ def test_readers_unusual() -> None:
     # Empty headers -- also legal
     tr(
         READERS[SERVER, SEND_RESPONSE],
-        b"HTTP/1.0 200 OK\r\n" b"Foo:\r\n\r\n",
+        b"HTTP/1.0 200 OK\r\nFoo:\r\n\r\n",
         Response(
             status_code=200, headers=[("Foo", "")], http_version="1.0", reason=b"OK"
         ),
@@ -208,7 +211,7 @@ def test_readers_unusual() -> None:
 
     tr(
         READERS[SERVER, SEND_RESPONSE],
-        b"HTTP/1.0 200 OK\r\n" b"Foo: \t \t \r\n\r\n",
+        b"HTTP/1.0 200 OK\r\nFoo: \t \t \r\n\r\n",
         Response(
             status_code=200, headers=[("Foo", "")], http_version="1.0", reason=b"OK"
         ),
@@ -217,7 +220,7 @@ def test_readers_unusual() -> None:
     # Tolerate broken servers that leave off the response code
     tr(
         READERS[SERVER, SEND_RESPONSE],
-        b"HTTP/1.0 200\r\n" b"Foo: bar\r\n\r\n",
+        b"HTTP/1.0 200\r\nFoo: bar\r\n\r\n",
         Response(
             status_code=200, headers=[("Foo", "bar")], http_version="1.0", reason=b""
         ),
@@ -287,30 +290,30 @@ def test_readers_unusual() -> None:
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1\r\n" b"  folded: line\r\n\r\n",
+            b"HEAD /foo HTTP/1.1\r\n  folded: line\r\n\r\n",
             None,
         )
 
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1\r\n" b"foo  : line\r\n\r\n",
+            b"HEAD /foo HTTP/1.1\r\nfoo  : line\r\n\r\n",
             None,
         )
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1\r\n" b"foo\t: line\r\n\r\n",
+            b"HEAD /foo HTTP/1.1\r\nfoo\t: line\r\n\r\n",
             None,
         )
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1\r\n" b"foo\t: line\r\n\r\n",
+            b"HEAD /foo HTTP/1.1\r\nfoo\t: line\r\n\r\n",
             None,
         )
     with pytest.raises(LocalProtocolError):
-        tr(READERS[CLIENT, IDLE], b"HEAD /foo HTTP/1.1\r\n" b": line\r\n\r\n", None)
+        tr(READERS[CLIENT, IDLE], b"HEAD /foo HTTP/1.1\r\n: line\r\n\r\n", None)
 
 
 def test__obsolete_line_fold_bytes() -> None:
@@ -343,7 +346,7 @@ def _run_reader_iter(
         yield reader.read_eof()
 
 
-def _run_reader(*args: Any) -> List[Event]:
+def _run_reader(*args: Any) -> list[Event]:
     events = list(_run_reader_iter(*args))
     return normalize_data_events(events)
 
@@ -412,10 +415,7 @@ def test_ChunkedReader() -> None:
 
     t_body_reader(
         ChunkedReader,
-        b"5\r\n01234\r\n"
-        + b"10\r\n0123456789abcdef\r\n"
-        + b"0\r\n"
-        + b"Some: header\r\n\r\n",
+        b"5\r\n01234\r\n10\r\n0123456789abcdef\r\n0\r\nSome: header\r\n\r\n",
         [
             Data(data=b"012340123456789abcdef"),
             EndOfMessage(headers=[("Some", "header")]),
@@ -447,9 +447,9 @@ def test_ChunkedReader() -> None:
     t_body_reader(
         ChunkedReader,
         b"5; hello=there\r\n"
-        + b"xxxxx"
-        + b"\r\n"
-        + b'0; random="junk"; some=more; canbe=lonnnnngg\r\n\r\n',
+        b"xxxxx"
+        b"\r\n"
+        b'0; random="junk"; some=more; canbe=lonnnnngg\r\n\r\n',
         [Data(data=b"xxxxx"), EndOfMessage()],
     )
 
@@ -533,7 +533,7 @@ def test_reject_garbage_after_response_line() -> None:
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1 xxxxxx\r\n" b"Host: a\r\n\r\n",
+            b"HEAD /foo HTTP/1.1 xxxxxx\r\nHost: a\r\n\r\n",
             None,
         )
 
@@ -542,7 +542,7 @@ def test_reject_garbage_in_header_line() -> None:
     with pytest.raises(LocalProtocolError):
         tr(
             READERS[CLIENT, IDLE],
-            b"HEAD /foo HTTP/1.1\r\n" b"Host: foo\x00bar\r\n\r\n",
+            b"HEAD /foo HTTP/1.1\r\nHost: foo\x00bar\r\n\r\n",
             None,
         )
 
@@ -553,7 +553,7 @@ def test_reject_non_vchar_in_path() -> None:
         message.append(bad_char)
         message.extend(b" HTTP/1.1\r\nHost: foobar\r\n\r\n")
         with pytest.raises(LocalProtocolError):
-            tr(READERS[CLIENT, IDLE], message, None)
+            tr(READERS[CLIENT, IDLE], bytes(message), None)
 
 
 # https://github.com/python-hyper/h11/issues/57
diff --git a/h11/tests/test_receivebuffer.py b/h11/tests/test_receivebuffer.py
index 21a3870..8bd948d 100644
--- a/h11/tests/test_receivebuffer.py
+++ b/h11/tests/test_receivebuffer.py
@@ -1,6 +1,3 @@
-import re
-from typing import Tuple
-
 import pytest
 
 from .._receivebuffer import ReceiveBuffer
@@ -119,7 +116,7 @@ def test_receivebuffer() -> None:
         ),
     ],
 )
-def test_receivebuffer_for_invalid_delimiter(data: Tuple[bytes]) -> None:
+def test_receivebuffer_for_invalid_delimiter(data: tuple[bytes]) -> None:
     b = ReceiveBuffer()
 
     for line in data:
diff --git a/h11/tests/test_state.py b/h11/tests/test_state.py
index bc974e6..6100a84 100644
--- a/h11/tests/test_state.py
+++ b/h11/tests/test_state.py
@@ -1,10 +1,11 @@
+# ruff: noqa: N802
+
 import pytest
 
 from .._events import (
     ConnectionClosed,
     Data,
     EndOfMessage,
-    Event,
     InformationalResponse,
     Request,
     Response,
@@ -14,7 +15,6 @@
     _SWITCH_UPGRADE,
     CLIENT,
     CLOSED,
-    ConnectionState,
     DONE,
     IDLE,
     MIGHT_SWITCH_PROTOCOL,
@@ -23,6 +23,7 @@
     SEND_RESPONSE,
     SERVER,
     SWITCHED_PROTOCOL,
+    ConnectionState,
 )
 from .._util import LocalProtocolError
 
diff --git a/h11/tests/test_util.py b/h11/tests/test_util.py
index 79bc095..a5a5323 100644
--- a/h11/tests/test_util.py
+++ b/h11/tests/test_util.py
@@ -1,3 +1,5 @@
+# ruff: noqa: N802, PT017
+
 import re
 import sys
 import traceback
@@ -6,11 +8,11 @@
 import pytest
 
 from .._util import (
-    bytesify,
     LocalProtocolError,
     ProtocolError,
     RemoteProtocolError,
     Sentinel,
+    bytesify,
     validate,
 )
 
@@ -36,6 +38,7 @@ def test_LocalProtocolError() -> None:
     def thunk() -> NoReturn:
         raise LocalProtocolError("a", error_status_hint=420)
 
+    orig_traceback = ""
     try:
         try:
             thunk()
@@ -86,7 +89,7 @@ class S(Sentinel, metaclass=Sentinel):
         pass
 
     assert repr(S) == "S"
-    assert S == S
+    assert S == S  # noqa: PLR0124, expected test
     assert type(S).__name__ == "S"
     assert S in {S}
     assert type(S) is S
diff --git a/pylock.toml b/pylock.toml
new file mode 100644
index 0000000..d1cf5d5
--- /dev/null
+++ b/pylock.toml
@@ -0,0 +1,479 @@
+# This file is @generated by PDM.
+# It is not intended for manual editing.
+lock-version = "1.0"
+requires-python = ">=3.10"
+environments = [
+    "python_version >= \"3.10\"",
+]
+extras = []
+dependency-groups = ["default", "dev"]
+default-groups = ["default"]
+created-by = "pdm"
+
+[[packages]]
+name = "pytest"
+version = "8.4.2"
+requires-python = ">=3.9"
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+[packages.tool.pdm]
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+]
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+[[packages]]
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+[packages.tool.pdm]
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+    "packaging>=25",
+    "tomli>=2.3; python_version < \"3.11\"",
+]
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+    "filelock<4,>=3.12.2",
+    "importlib-metadata>=6.6; python_version < \"3.8\"",
+    "platformdirs<5,>=3.9.1",
+    "typing-extensions>=4.13.2; python_version < \"3.11\"",
+]
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+version = "0.4.0"
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+]
+marker = "\"dev\" in dependency_groups"
+
+[packages.tool.pdm]
+dependencies = []
+
+[tool.pdm]
+hashes = {sha256 = "42afc75737c8509c983671b1f9bbe58ff57676dc73f453b3f9453563b4d55665"}
+strategy = ["inherit_metadata", "static_urls"]
+
+[[tool.pdm.targets]]
+requires_python = ">=3.10"
diff --git a/pyproject.toml b/pyproject.toml
index 64a6883..280a70d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,97 @@
+[build-system]
+requires = [
+    "setuptools >= 77",
+    "setuptools_scm >= 6.4"
+]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "h11"
+authors = [
+    { name = "Nathaniel J. Smith", email = "njs@pobox.com" }
+]
+license = { file = "MIT" }
+requires-python = ">=3.10"
+dependencies = [
+    "typing_extensions; python_version < '3.12'"
+]
+dynamic = ["version"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Topic :: Internet :: WWW/HTTP",
+    "Topic :: System :: Networking",
+]
+
+[project.urls]
+source = "https://github.com/python-hyper/h11"
+
+[tool.setuptools]
+packages = ["h11"]
+
+[tool.setuptools.dynamic]
+version = { attr = "h11._version.__version__" }
+
+[dependency-groups]
+dev = [
+    "ruff>=0.14.2",
+    "pytest>=8.4.2",
+    "pytest-cov>=7.0.0",
+    "tox>=4.32.0",
+    "pyrefly>=0.39.2",
+]
+
+[tool.ruff]
+target-version = "py310"
+line-length = 88
+respect-gitignore = true
+src = ["h11"]
+exclude = ["fuzz", "examples", "docs/source", "bench"]
+
+[tool.ruff.lint]
+select = ["ALL"]
+ignore = [
+    "TID252",
+    "ERA001",
+    "PLR2004", # HTTP library has magic numbers, shocking!
+
+    # Existing project code style
+    "D",
+    "SLF001",
+    "PGH003",
+    
+    # Bad lints
+    "TRY",
+    "EM",
+    "S101",    # Allow asserts
+    "TC006",
+    "COM812",
+    "PTH",
+    "ANN401",
+    "FBT",
+    "PLR0915",
+    "PLR0911",
+    "PLR0912",
+    "S105",  # Hardcoded password? what?
+    "C90",
+]
+
+[tool.pyrefly]
+project-includes = [
+    "h11",
+]
+python-version = "3.10"
+
 [tool.towncrier]
 # Usage:
 # - PRs should drop a file like "issuenumber.feature" in newsfragments
@@ -44,3 +138,7 @@ strict = true
 warn_unused_configs = true
 warn_unused_ignores = true
 show_error_codes = true
+
+[tool.tox]
+requires = ["tox>=4.32"]
+envlist = ["format", "py310", "py311", "py312", "py313", "py314", "pypy3"]
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 73713e2..0000000
--- a/setup.py
+++ /dev/null
@@ -1,35 +0,0 @@
-from setuptools import setup, find_packages
-
-# defines __version__
-exec(open("h11/_version.py").read())
-
-setup(
-    name="h11",
-    version=__version__,
-    description=
-        "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1",
-    long_description=open("README.rst").read(),
-    author="Nathaniel J. Smith",
-    author_email="njs@pobox.com",
-    license="MIT",
-    packages=find_packages(exclude=["h11.tests"]),
-    package_data={'h11': ['py.typed']},
-    url="https://github.com/python-hyper/h11",
-    python_requires=">=3.8",
-    classifiers=[
-        "Development Status :: 3 - Alpha",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: MIT License",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "Topic :: Internet :: WWW/HTTP",
-        "Topic :: System :: Networking",
-    ],
-)
diff --git a/test-requirements.txt b/test-requirements.txt
deleted file mode 100644
index 9955dec..0000000
--- a/test-requirements.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-pytest
-pytest-cov
diff --git a/tox.ini b/tox.ini
index 6614ecf..3077c85 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,32 +1,28 @@
 [tox]
-envlist = format, py{38, 39, 310, 311, 312, py3}, mypy
+envlist = format, py{310, 311, 312, 313, 314, py3}, typecheck
 
 [gh-actions]
 python =
-    3.8: py38, format, mypy
-    3.9: py39
-    3.10: py310
+    3.10: py310 format typecheck
     3.11: py311
     3.12: py312
     3.13: py313
-    pypy-3.9: pypy3
+    3.14: py314
     pypy-3.10: pypy3
 
 [testenv]
-deps = -r{toxinidir}/test-requirements.txt
+dependency_groups = dev
 commands = pytest --cov=h11 --cov-config=.coveragerc h11
 
 [testenv:format]
-basepython = python3.8
-deps = -r{toxinidir}/format-requirements.txt
+basepython = python3.11
+dependency_groups = dev
 commands =
-    black --check --diff h11/ bench/ examples/ fuzz/
-    isort --check --diff --profile black --dt h11 bench examples fuzz
+    ruff check --diff 
+    ruff format --check --diff
 
-[testenv:mypy]
-basepython = python3.8
-deps =
-    mypy==1.8.0
-    pytest
+[testenv:typecheck]
+basepython = python3.11
+dependency_groups = dev
 commands =
-    mypy h11/
+    pyrefly check h11/