diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd238ab..6054c49 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,17 +8,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ 2.7, 3.7, 3.8, 3.9, 3.10, 3.11 ]
+        python-version: [ '2.7', '3.7', '3.8', '3.9', '3.10', '3.11' ]
         include:
-          - python-version: 3.7
+          - python-version: '3.7'
             disable: '--disable=consider-using-f-string'
-          - python-version: 3.8
+          - python-version: '3.8'
             disable: '--disable=consider-using-f-string,redundant-u-string-prefix'
-          - python-version: 3.9
+          - python-version: '3.9'
             disable: '--disable=consider-using-f-string,redundant-u-string-prefix'
-          - python-version: 3.10
+          - python-version: '3.10'
             disable: '--disable=consider-using-f-string,redundant-u-string-prefix'
-          - python-version: 3.11
+          - python-version: '3.11'
             disable: '--disable=consider-using-f-string,redundant-u-string-prefix'
     steps:
       - uses: actions/checkout@v2