diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d0752845..681b41b7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,10 +30,11 @@ jobs:
           -Replace '^__version__\s*=\s*"[^"]+', "`$0.${{ steps.vars.outputs.sha_short }}" |`
           Out-File version.py
 
+      # Ensure Python version
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: $PYTHON_VERSION
+          python-version: "$PYTHON_VERSION"
 
       - name: Set up Python virtual environment
         run: |
@@ -97,7 +98,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: $PYTHON_VERSION
+          python-version: "$PYTHON_VERSION"
 
       - name: Install system dependencies
         run: |
@@ -167,6 +168,12 @@ jobs:
           echo "app_version=$(python3 -c 'from version import __version__ as v; print(v)')" >> "${GITHUB_OUTPUT}"
           echo "sha_short=$(git rev-parse --short HEAD)" >> "${GITHUB_OUTPUT}"
 
+      # Ensure Python version
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "$PYTHON_VERSION"
+
       - name: Append git revision to project version
         run: |
           sed -ri "s/^__version__\s*=\s*\"[^\"]+/\0.${{ steps.vars.outputs.sha_short }}/" version.py