diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 11e88c6b3..9551ce84b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9, 3.10]
+        python-version: ['3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v3
@@ -36,4 +36,4 @@ jobs:
     - name: Run unittest
       run: |
         pip install pytest
-        pytest -vv
\ No newline at end of file
+        pytest -vv