diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 7bf3220..b130c7b 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -16,11 +16,11 @@ jobs:
       fail-fast: false
       matrix:
         tag:
-          - 2.7
-          - 3.7
-          - 3.8
-          - 3.9
-          - 3.10
+          - '2.7'
+          - '3.7'
+          - '3.8'
+          - '3.9'
+          - '3.10'
     steps:
       - uses: actions/checkout@v2
       - uses: docker/setup-buildx-action@v1