diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6b6e43a..064d862 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps: