diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 9c28323..1f0882c 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -14,6 +14,7 @@ jobs:
       matrix:
         ruby:
           - 'head'
+          - '3.3'
           - '3.1'
           - '3.0'
           - '2.7'