diff --git a/.github/copilot-setup-steps.yml b/.github/copilot-setup-steps.yml
index 64ac90191a..c49109201e 100644
--- a/.github/copilot-setup-steps.yml
+++ b/.github/copilot-setup-steps.yml
@@ -32,7 +32,6 @@ jobs:
         uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: pytensor-test
-          micromamba-version: "1.5.10-0"
           init-shell: bash
           post-cleanup: "all"
           create-args: python=3.13
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 3383d1b7dc..5c8199034b 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -17,7 +17,6 @@ jobs:
           persist-credentials: false
       - uses: mamba-org/setup-micromamba@v2
         with:
-          micromamba-version: "1.5.10-0" # until https://github.com/mamba-org/setup-micromamba/issues/225 is resolved
           environment-file: environment.yml
           init-shell: bash
           cache-environment: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bf5a9924d9..165b956193 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -167,7 +167,6 @@ jobs:
         uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: pytensor-test
-          micromamba-version: "1.5.10-0" # until https://github.com/mamba-org/setup-micromamba/issues/225 is resolved
           init-shell: bash
           post-cleanup: "all"
           create-args: python=${{ matrix.python-version }}
@@ -252,7 +251,6 @@ jobs:
         uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: pytensor-test
-          micromamba-version: "1.5.10-0" # until https://github.com/mamba-org/setup-micromamba/issues/225 is resolved
           init-shell: bash
           post-cleanup: "all"
       - name: Install dependencies