diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5aca087..c29040d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,6 +16,6 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@477b21f02be01bcb8030d50f37cfec92bfa615b6
         with:
-          ruby-version: 2.6
+          ruby-version: 4.0.6
       - name: Run tests
         run: find . -name "*.rb" -print0 | xargs -0 -I@ sh -c 'ruby @'