diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 1f120ec..f2fd212 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, ubuntu-latest]
-        python-version: [3.6, 3.10]
+        python-version: ['3.6', '3.10']
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -44,7 +44,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.10]
+        python-version: ['3.10']
     runs-on: ${{ matrix.os }}
 
     steps: