diff --git a/Sources/SQLite/Core/Blob.swift b/Sources/SQLite/Core/Blob.swift
index a709fb42..6bf8f3a0 100644
--- a/Sources/SQLite/Core/Blob.swift
+++ b/Sources/SQLite/Core/Blob.swift
@@ -22,7 +22,7 @@
 // THE SOFTWARE.
 //
 
-public struct Blob {
+public struct Blob: Sendable {
 
     public let bytes: [UInt8]
 
diff --git a/Sources/SQLite/Core/Errors.swift b/Sources/SQLite/Core/Errors.swift
index 3cd7ae9f..d95d544d 100644
--- a/Sources/SQLite/Core/Errors.swift
+++ b/Sources/SQLite/Core/Errors.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-public enum QueryError: Error, CustomStringConvertible {
+public enum QueryError: Error, CustomStringConvertible, Sendable {
     case noSuchTable(name: String)
     case noSuchColumn(name: String, columns: [String])
     case ambiguousColumn(name: String, similar: [String])
diff --git a/Sources/SQLite/Core/SQLiteVersion.swift b/Sources/SQLite/Core/SQLiteVersion.swift
index fa7358da..7ae4aa51 100644
--- a/Sources/SQLite/Core/SQLiteVersion.swift
+++ b/Sources/SQLite/Core/SQLiteVersion.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-public struct SQLiteVersion: Comparable, CustomStringConvertible {
+public struct SQLiteVersion: Comparable, CustomStringConvertible, Sendable {
     public let major: Int
     public let minor: Int
     public var point: Int = 0
@@ -17,6 +17,6 @@ public struct SQLiteVersion: Comparable, CustomStringConvertible {
         lhs.tuple == rhs.tuple
     }
 
-    static var zero: SQLiteVersion = .init(major: 0, minor: 0)
+    static let zero: SQLiteVersion = .init(major: 0, minor: 0)
     private var tuple: (Int, Int, Int) { (major, minor, point) }
 }
diff --git a/Sources/SQLite/Core/Value.swift b/Sources/SQLite/Core/Value.swift
index 249a7728..5e1c6a92 100644
--- a/Sources/SQLite/Core/Value.swift
+++ b/Sources/SQLite/Core/Value.swift
@@ -27,7 +27,7 @@
 ///
 ///   Do not conform custom types to the Binding protocol. See the `Value`
 ///   protocol, instead.
-public protocol Binding {}
+public protocol Binding: Sendable {}
 
 public protocol Number: Binding {}
 
diff --git a/Sources/SQLite/Typed/AggregateFunctions.swift b/Sources/SQLite/Typed/AggregateFunctions.swift
index 17fc4a20..11c6a9b7 100644
--- a/Sources/SQLite/Typed/AggregateFunctions.swift
+++ b/Sources/SQLite/Typed/AggregateFunctions.swift
@@ -22,7 +22,7 @@
 // THE SOFTWARE.
 //
 
-private enum Function: String {
+private enum Function: String, Sendable {
     case count
     case max
     case min
diff --git a/Sources/SQLite/Typed/Collation.swift b/Sources/SQLite/Typed/Collation.swift
index fec66129..ad42313d 100644
--- a/Sources/SQLite/Typed/Collation.swift
+++ b/Sources/SQLite/Typed/Collation.swift
@@ -25,7 +25,7 @@
 /// A collating function used to compare to strings.
 ///
 /// - SeeAlso: <https://www.sqlite.org/datatype3.html#collation>
-public enum Collation {
+public enum Collation: Sendable {
 
     /// Compares string by raw data.
     case binary
diff --git a/Sources/SQLite/Typed/CoreFunctions.swift b/Sources/SQLite/Typed/CoreFunctions.swift
index c4359d8b..19657714 100644
--- a/Sources/SQLite/Typed/CoreFunctions.swift
+++ b/Sources/SQLite/Typed/CoreFunctions.swift
@@ -23,7 +23,7 @@
 //
 import Foundation
 
-private enum Function: String {
+private enum Function: String, Sendable {
     case abs
     case round
     case random
diff --git a/Sources/SQLite/Typed/DateAndTimeFunctions.swift b/Sources/SQLite/Typed/DateAndTimeFunctions.swift
index b4382194..e1b55b5f 100644
--- a/Sources/SQLite/Typed/DateAndTimeFunctions.swift
+++ b/Sources/SQLite/Typed/DateAndTimeFunctions.swift
@@ -29,7 +29,7 @@ import Foundation
 /// The strftime() function also takes a format string as its first argument.
 ///
 /// https://www.sqlite.org/lang_datefunc.html
-public class DateFunctions {
+public final class DateFunctions: Sendable {
     /// The date() function returns the date in this format: YYYY-MM-DD.
     public static func date(_ timestring: String, _ modifiers: String...) -> Expression<Date?> {
         timefunction("date", timestring: timestring, modifiers: modifiers)
diff --git a/Sources/SQLite/Typed/Expression.swift b/Sources/SQLite/Typed/Expression.swift
index dcc44fe4..93d70f0c 100644
--- a/Sources/SQLite/Typed/Expression.swift
+++ b/Sources/SQLite/Typed/Expression.swift
@@ -22,7 +22,7 @@
 // THE SOFTWARE.
 //
 
-public protocol ExpressionType: Expressible, CustomStringConvertible { // extensions cannot have inheritance clauses
+public protocol ExpressionType: Expressible, CustomStringConvertible, Sendable { // extensions cannot have inheritance clauses
 
     associatedtype UnderlyingType = Void
 
@@ -67,7 +67,7 @@ public struct Expression<Datatype>: ExpressionType {
 
 }
 
-public protocol Expressible {
+public protocol Expressible: Sendable {
 
     var expression: Expression<Void> { get }
 
diff --git a/Sources/SQLite/Typed/Operators.swift b/Sources/SQLite/Typed/Operators.swift
index 1c611cbc..04676920 100644
--- a/Sources/SQLite/Typed/Operators.swift
+++ b/Sources/SQLite/Typed/Operators.swift
@@ -24,7 +24,7 @@
 
 // TODO: use `@warn_unused_result` by the time operator functions support it
 
-private enum Operator: String {
+private enum Operator: String, Sendable {
     case plus = "+"
     case minus = "-"
     case or = "OR"
diff --git a/Sources/SQLite/Typed/Query+with.swift b/Sources/SQLite/Typed/Query+with.swift
index d06c8896..d1def1cf 100644
--- a/Sources/SQLite/Typed/Query+with.swift
+++ b/Sources/SQLite/Typed/Query+with.swift
@@ -95,15 +95,15 @@ extension QueryType {
 }
 
 /// Materialization hints for `WITH` clause
-public enum MaterializationHint: String {
+public enum MaterializationHint: String, Sendable {
 
     case materialized = "MATERIALIZED"
 
     case notMaterialized = "NOT MATERIALIZED"
 }
 
-struct WithClauses {
-    struct Clause {
+struct WithClauses: Sendable {
+    struct Clause: Sendable {
         var alias: Table
         var columns: [Expressible]?
         var hint: MaterializationHint?
diff --git a/Sources/SQLite/Typed/Query.swift b/Sources/SQLite/Typed/Query.swift
index 6162fcc7..d82761c8 100644
--- a/Sources/SQLite/Typed/Query.swift
+++ b/Sources/SQLite/Typed/Query.swift
@@ -1168,7 +1168,7 @@ extension Connection {
 
 }
 
-public struct Row {
+public struct Row: Sendable {
 
     let columnNames: [String: Int]
 
@@ -1242,7 +1242,7 @@ public struct Row {
 }
 
 /// Determines the join operator for a query’s `JOIN` clause.
-public enum JoinType: String {
+public enum JoinType: String, Sendable {
 
     /// A `CROSS` join.
     case cross = "CROSS"
@@ -1256,7 +1256,7 @@ public enum JoinType: String {
 }
 
 /// ON CONFLICT resolutions.
-public enum OnConflict: String {
+public enum OnConflict: String, Sendable {
 
     case replace = "REPLACE"
 
@@ -1272,7 +1272,7 @@ public enum OnConflict: String {
 
 // MARK: - Private
 
-public struct QueryClauses {
+public struct QueryClauses: Sendable {
 
     var select = (distinct: false, columns: [Expression<Void>(literal: "*") as Expressible])
 
diff --git a/Sources/SQLite/Typed/Schema.swift b/Sources/SQLite/Typed/Schema.swift
index 919042ab..e0cf2654 100644
--- a/Sources/SQLite/Typed/Schema.swift
+++ b/Sources/SQLite/Typed/Schema.swift
@@ -495,7 +495,7 @@ public final class TableBuilder {
 
 }
 
-public enum PrimaryKey {
+public enum PrimaryKey: Sendable {
 
     case `default`
 
@@ -503,7 +503,7 @@ public enum PrimaryKey {
 
 }
 
-public struct Module {
+public struct Module: Sendable {
 
     fileprivate let name: String
 
@@ -592,7 +592,7 @@ private func reference(_ primary: (QueryType, Expressible)) -> Expressible {
     ])
 }
 
-private enum Modifier: String {
+private enum Modifier: String, Sendable {
 
     case unique = "UNIQUE"
 
diff --git a/Sources/SQLite/Typed/Setter.swift b/Sources/SQLite/Typed/Setter.swift
index 8dc8a0e0..a1d57baa 100644
--- a/Sources/SQLite/Typed/Setter.swift
+++ b/Sources/SQLite/Typed/Setter.swift
@@ -30,7 +30,7 @@ precedencegroup ColumnAssignment {
 
 infix operator <- : ColumnAssignment
 
-public struct Setter {
+public struct Setter: Sendable {
 
     let column: Expressible
     let value: Expressible
diff --git a/Sources/SQLite/Typed/WindowFunctions.swift b/Sources/SQLite/Typed/WindowFunctions.swift
index e71e1ada..7695c352 100644
--- a/Sources/SQLite/Typed/WindowFunctions.swift
+++ b/Sources/SQLite/Typed/WindowFunctions.swift
@@ -1,7 +1,7 @@
 import Foundation
 
 // see https://www.sqlite.org/windowfunctions.html#builtins
-private enum WindowFunction: String {
+private enum WindowFunction: String, Sendable {
     // swiftlint:disable identifier_name
     case ntile
     case row_number