diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 5531aa9a..aeae0283 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3"]
+        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3", "head"]
     env:
       DEBUG: "true"
     steps: