diff --git a/.github/workflows/cmake_ci.yml b/.github/workflows/cmake_ci.yml
index 0fba7228..96dff441 100644
--- a/.github/workflows/cmake_ci.yml
+++ b/.github/workflows/cmake_ci.yml
@@ -59,7 +59,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.10
+          python-version: '3.10'
 
       - name: Build Python wheels
         if: matrix.finufft_static_linking