diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 2a048e4..58c10ce 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Setup ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.8
+          ruby-version: 4.0.0
           bundler-cache: true
 
       - name: Run rubocop