diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 323b5506..80771953 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4", "head"]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4