diff --git a/.github/workflows/run_pytest.yml b/.github/workflows/run_pytest.yml
index 939bb1f..a047d48 100644
--- a/.github/workflows/run_pytest.yml
+++ b/.github/workflows/run_pytest.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
     runs-on: ${{matrix.os}}
 
     steps: