diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8ff79d626..1d56c2e46 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
+          - head
           - 3.0.0
           - 2.7.2
           - 2.6.6