diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 52a4a1750..02d7d3aa0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,10 +11,10 @@ jobs:
     strategy:
       matrix:
         ruby: [
-          3.0,
-          2.7,
-          2.6,
-          2.5,
+          '3.0',
+          '2.7',
+          '2.6',
+          '2.5',
           jruby,
           jruby-head
         ]