diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 905825d..501a213 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.1
+        ruby-version: 4.0.0
 
     - name: Install Bundler
       run: gem install bundler -v 2.5.23
diff --git a/.github/workflows/publish_gem.yml b/.github/workflows/publish_gem.yml
index da34511..37c0db3 100644
--- a/.github/workflows/publish_gem.yml
+++ b/.github/workflows/publish_gem.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.1
+          ruby-version: 4.0.0
 
       - name: Install Bundler
         run: gem install bundler -v 2.5.23