diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 00000000..c76072a8
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,12 @@
+jobs:
+  build:
+    docker:
+      - image: cimg/ruby:3.3.5
+    environment:
+      RAILS_ENV: test
+    steps:
+      - checkout
+      - run: |
+          bundle install
+      - run: |
+          bundle exec rake test
diff --git a/.travis.yml b/.travis.yml
index 45fb2441..6c607d27 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,8 @@ rvm:
   - 2.6
   - 2.7
   - 3.0
+  - 3.1
+  - 3.2
   - ruby-head
   - jruby
 jobs:
diff --git a/README.markdown b/README.markdown
index 410d1bff..a768ef10 100644
--- a/README.markdown
+++ b/README.markdown
@@ -1,7 +1,6 @@
 # CodeRay
 
-[![Build Status](https://travis-ci.org/rubychan/coderay.svg?branch=master)](https://travis-ci.org/rubychan/coderay)
-[![Gem Version](https://badge.fury.io/rb/coderay.svg)](https://badge.fury.io/rb/coderay) [![Maintainability](https://api.codeclimate.com/v1/badges/e015bbd5eab45d948b6b/maintainability)](https://codeclimate.com/github/rubychan/coderay/maintainability)
+[![CircleCI](https://dl.circleci.com/status-badge/img/gh/rubychan/coderay/tree/master.svg?style=svg&circle-token=CCIPRJ_BbFff6nMhNtPdrCBNMDxNq_be00bbb00849a29d8d8d2e28e7b84cbf76a9ee5c)](https://dl.circleci.com/status-badge/redirect/gh/rubychan/coderay/tree/master) [![Gem Version](https://badge.fury.io/rb/coderay.svg)](https://badge.fury.io/rb/coderay) [![Maintainability](https://api.codeclimate.com/v1/badges/e015bbd5eab45d948b6b/maintainability)](https://codeclimate.com/github/rubychan/coderay/maintainability)
 
 ## About