diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 1641af8..bfb6132 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.2', '3.3', '3.4']
+        ruby-version: ['3.2', '3.3', '3.4', '4.0']
         test: ['minitest', 'rspec']
         gemfile:
           - Gemfile.rails72