diff --git a/.github/workflows/rubocop.yaml b/.github/workflows/rubocop.yaml
index 9419a686..1ab66c10 100644
--- a/.github/workflows/rubocop.yaml
+++ b/.github/workflows/rubocop.yaml
@@ -16,7 +16,7 @@ jobs:
     - name: setup ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '4.0.1'
     - name: cache gems
       uses: actions/cache@v4
       with: