diff --git a/.github/workflows/app.yml b/.github/workflows/app.yml
index 4656a80..13f8d4c 100644
--- a/.github/workflows/app.yml
+++ b/.github/workflows/app.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10]
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
     - name: Checkout code