diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2f9d7be..dade13e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,9 +9,9 @@ jobs:
     strategy:
       matrix:
         ruby:
-        - 3.1
-        - 3.0
-        - 2.7
+        - '3.1'
+        - '3.0'
+        - '2.7'
         - jruby
         - truffleruby
         os:
@@ -34,9 +34,9 @@ jobs:
     strategy:
       matrix:
         ruby:
-        - 3.1
-        - 3.0
-        - 2.7
+        - '3.1'
+        - '3.0'
+        - '2.7'
         - jruby
     runs-on: windows-latest
     steps: