diff --git a/.github/workflows/rubocop.yaml b/.github/workflows/rubocop.yaml
index e61e36fe..24077ff2 100644
--- a/.github/workflows/rubocop.yaml
+++ b/.github/workflows/rubocop.yaml
@@ -21,7 +21,7 @@ jobs:
     - name: setup ruby
       uses: ruby/setup-ruby@d45b1a4e94b71acab930e56e79c6aa188764e7f9 # v1.316.0
       with:
-        ruby-version: '4.0'
+        ruby-version: '4.0.5'
     - name: cache gems
       uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
       with: