diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 50bd76c..263777e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       max-parallel: 5
       matrix:
-        python-version: [3.6', '3.7', '3.8']
+        python-version: ['3.6', '3.7', '3.8']
 
     steps:
     - uses: actions/checkout@v2