diff --git a/.github/workflows/rubocop.yaml b/.github/workflows/rubocop.yaml
index 715fbb02..81288941 100644
--- a/.github/workflows/rubocop.yaml
+++ b/.github/workflows/rubocop.yaml
@@ -21,7 +21,7 @@ jobs:
     - name: setup ruby
       uses: ruby/setup-ruby@26e5b7d197ebf60545ee9667bcbace0be11ccaec # v1.334.0
       with:
-        ruby-version: '4.0.7'
+        ruby-version: '4.0.9'
     - name: cache gems
       uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
       with: