diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index fefe8c6..b31f275 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -33,7 +33,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '4.0.0'
         bundler-cache: true
 
     - name: Run linter
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 053d964..f0ec27d 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -27,6 +27,6 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-          ruby-version: '3.2'
+          ruby-version: '4.0.0'
 
       - uses: rubygems/release-gem@v1