diff --git a/.github/workflows/aio_integration.yml b/.github/workflows/aio_integration.yml
index cf97133f..21eaf0fc 100644
--- a/.github/workflows/aio_integration.yml
+++ b/.github/workflows/aio_integration.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/aio_sanity_check.yml b/.github/workflows/aio_sanity_check.yml
index 8661f84e..b1b8bf0e 100644
--- a/.github/workflows/aio_sanity_check.yml
+++ b/.github/workflows/aio_sanity_check.yml
@@ -49,7 +49,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index 01c695c5..1c600365 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/integration_full.yml b/.github/workflows/integration_full.yml
index 1adf0f95..0e03a08b 100644
--- a/.github/workflows/integration_full.yml
+++ b/.github/workflows/integration_full.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/on_push_coverage.yml b/.github/workflows/on_push_coverage.yml
index bdbf62f7..8bc23692 100644
--- a/.github/workflows/on_push_coverage.yml
+++ b/.github/workflows/on_push_coverage.yml
@@ -18,7 +18,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/on_release.yml b/.github/workflows/on_release.yml
index af7bab90..45b6d8ef 100644
--- a/.github/workflows/on_release.yml
+++ b/.github/workflows/on_release.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Get version
         id: version
         uses: actions/github-script@v7
diff --git a/.github/workflows/on_release_docs.yml b/.github/workflows/on_release_docs.yml
index 6fc2bffa..292fc4bf 100644
--- a/.github/workflows/on_release_docs.yml
+++ b/.github/workflows/on_release_docs.yml
@@ -42,7 +42,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project
diff --git a/.github/workflows/publish_aiobotocore_full.yml b/.github/workflows/publish_aiobotocore_full.yml
index e9cc78ee..6e8fa890 100644
--- a/.github/workflows/publish_aiobotocore_full.yml
+++ b/.github/workflows/publish_aiobotocore_full.yml
@@ -123,7 +123,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Install builder
         run: |
           rm -rf mypy_boto3_builder
diff --git a/.github/workflows/publish_aiobotocore_stubs.yml b/.github/workflows/publish_aiobotocore_stubs.yml
index a96c6bf6..f24dbbec 100644
--- a/.github/workflows/publish_aiobotocore_stubs.yml
+++ b/.github/workflows/publish_aiobotocore_stubs.yml
@@ -130,7 +130,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Install builder
         run: |
           rm -rf mypy_boto3_builder
diff --git a/.github/workflows/publish_boto3_full.yml b/.github/workflows/publish_boto3_full.yml
index 0e61eec6..3cd920bc 100644
--- a/.github/workflows/publish_boto3_full.yml
+++ b/.github/workflows/publish_boto3_full.yml
@@ -152,7 +152,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Install boto3
         run: |
           mkdir installtemp
diff --git a/.github/workflows/publish_boto3_stubs.yml b/.github/workflows/publish_boto3_stubs.yml
index f3722edd..11ee8538 100644
--- a/.github/workflows/publish_boto3_stubs.yml
+++ b/.github/workflows/publish_boto3_stubs.yml
@@ -185,7 +185,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Install boto3
         run: |
           mkdir installtemp
diff --git a/.github/workflows/publish_types_aioboto3.yml b/.github/workflows/publish_types_aioboto3.yml
index d15c9387..0f6af620 100644
--- a/.github/workflows/publish_types_aioboto3.yml
+++ b/.github/workflows/publish_types_aioboto3.yml
@@ -124,7 +124,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Install builder
         run: |
           rm -rf mypy_boto3_builder
diff --git a/.github/workflows/sanity_check.yml b/.github/workflows/sanity_check.yml
index 09d60b25..cf8b96e1 100644
--- a/.github/workflows/sanity_check.yml
+++ b/.github/workflows/sanity_check.yml
@@ -49,7 +49,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: pyproject.toml
+          python-version-file: .python-version
       - name: Set up uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install the project