diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index d00d5c3..e696ec7 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -20,7 +20,7 @@ jobs:
     - name: setup ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.0'
+        ruby-version: '4.0.2'
 
     - name: docker
       uses: elgohr/Publish-Docker-Github-Action@742a180fa47f3adfb5115902ae4955acc6ad769b # v4