diff --git a/.github/workflows/mypy.yaml b/.github/workflows/mypy.yaml
index b8ab802..4781688 100644
--- a/.github/workflows/mypy.yaml
+++ b/.github/workflows/mypy.yaml
@@ -22,7 +22,7 @@ jobs:
       - name: Setup python
         uses: https://github.com/actions/setup-python@v5
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.12"
       - name: Install uv
         uses: https://github.com/astral-sh/setup-uv@v5
       - name: Install corrlib
diff --git a/.github/workflows/ruff.yaml b/.github/workflows/ruff.yaml
index 778743b..e0db1b0 100644
--- a/.github/workflows/ruff.yaml
+++ b/.github/workflows/ruff.yaml
@@ -23,7 +23,7 @@ jobs:
       - name: Setup python
         uses: https://github.com/actions/setup-python@v5
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.12"
       - name: Install uv
         uses: https://github.com/astral-sh/setup-uv@v5
       - name: Install corrlib