diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 613e1698..a503d380 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -15,7 +15,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.4.7'
+        ruby-version: '4.0.0'
 
     - name: Publish to RubyGems
       if: contains(github.ref, 'refs/tags/v')