diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 3a7fa9d..60a7c34 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -11,11 +11,11 @@ jobs:
           - os: ubuntu-latest
             numpy-version: 1.16
             scipy-version: 1.4
-            python-version: 3.9
+            python-version: '3.9'
           - os: ubuntu-latest
             numpy-version: auto
             scipy-version: auto
-            python-version: 3.10
+            python-version: '3.10'
 
     steps:
       - uses: actions/checkout@v2