diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index c388785c..6a90f436 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -14,6 +14,7 @@ jobs:
       matrix:
         ruby:
           - head
+          - '3.4'
           - '3.3'
           - '3.2'
           - '3.1'