diff --git a/.github/workflows/test-changes.yml b/.github/workflows/test-changes.yml
index f516d994..dc921e42 100644
--- a/.github/workflows/test-changes.yml
+++ b/.github/workflows/test-changes.yml
@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu-latest", "windows-latest", "macos-latest" ]
-        python: [2.7, 3.6, 3.7, 3.8, 3.9, 3.10]
+        python: ['2.7', '3.6', '3.7', '3.8', '3.9', '3.10']
 
     runs-on: "${{ matrix.os }}"