diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index 847bb76c..84143356 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -7,10 +7,10 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.0
-          - 3.1
-          - 3.2
-          - 3.3
+          - '3.0'
+          - '3.1'
+          - '3.2'
+          - '3.3'
     steps:
     - uses: actions/checkout@v4
     - name: script/cibuild-docker