diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index f159e5cb..c5de4441 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -16,6 +16,7 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
         rails:
           - "7.1"
           - "7.2"