diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9094520c6..7801ebf1e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,11 +19,12 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [ ubuntu-latest ]
+        os: [ubuntu-latest]
         ruby:
-          - '3.0'
-          - '3.1'
-          - '3.2'
+          - "3.0"
+          - "3.1"
+          - "3.2"
+          - "3.3"
         gemfile:
           - gemfiles/rails_6_0.gemfile
           - gemfiles/rails_6_1.gemfile
@@ -53,7 +54,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.2
+          ruby-version: "3.3"
           bundler-cache: true
       - run: bundle exec rake spec || echo "Rails edge test is done."
 
@@ -73,6 +74,6 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 'ruby-head'
+          ruby-version: "ruby-head"
           bundler-cache: true
       - run: bundle exec rake spec || echo "Ruby edge test is done."