diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f86e909b..15017ecc 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -10,6 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
+          - '3.4'
           - '3.3'
           - '3.2'
           - '3.1'