diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index d2091f8..94f0f29 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}