diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 2690ed6..5633035 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9, 3.10, 3.11, 3.12, 3.13]
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
       - uses: actions/checkout@v2