diff --git a/.github/workflows/integration_test.yml b/.github/workflows/integration_test.yml
index c8cd766e..0d7f5614 100644
--- a/.github/workflows/integration_test.yml
+++ b/.github/workflows/integration_test.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 6
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         os: [ubuntu-latest, macos-latest] # TODO: windows-latest
 
     steps:
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index d12858fb..8a68a68e 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 12
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps: