diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5284f20..11bf750 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,12 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ["3.0", "2.7", "2.6", "jruby-head"]
+        ruby:
+          - 3.1
+          - "3.0" # Needs quotes, otherwise stringified to "3"
+          - 2.7
+          - 2.6
+          - jruby-head
 
     steps:
       - uses: actions/checkout@v2