diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cab34a6..1cfe56a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,11 +23,11 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version: 
-          - 2.7
-          - 3.0
-          - 3.1
-          - 3.2
-          - 3.3
+          - '2.7'
+          - '3.0'
+          - '3.1'
+          - '3.2'
+          - '3.3'
 
     steps:
     - uses: actions/checkout@v3