diff --git a/.github/workflows/smoke.yml b/.github/workflows/smoke.yml
index a0fa94fe5..2c360ce55 100644
--- a/.github/workflows/smoke.yml
+++ b/.github/workflows/smoke.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.12
+          python-version: "3.12"
 
       - name: Packages
         run: pip install -r tests/requirements.txt
@@ -37,10 +37,10 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: ubuntu-latest, python: 3.9, ffmpeg: "6.1", extras: true}
-          - {os: ubuntu-latest, python: 3.9, ffmpeg: "6.0"}
+          - {os: ubuntu-latest, python: "3.9", ffmpeg: "6.1", extras: true}
+          - {os: ubuntu-latest, python: "3.9", ffmpeg: "6.0"}
           - {os: ubuntu-latest, python: pypy3.9, ffmpeg: "6.1"}
-          - {os: macos-12,  python: 3.9, ffmpeg: "6.1"}
+          - {os: macos-12,  python: "3.9", ffmpeg: "6.1"}
 
     env:
       PYAV_PYTHON: python${{ matrix.config.python }}
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 17c9a687b..564a1c922 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: "3.9"
       - name: Build source package
         run: |
           pip install cython
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: "3.9"
       - name: Set up QEMU
         if: matrix.os == 'ubuntu-latest'
         uses: docker/setup-qemu-action@v3