diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 65ebdfe..210b652 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -27,7 +27,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ["3.2", "3.3", "3.4"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
         gemfile:
           - rails_71
           - rails_72