diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index a962af0..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,93 +0,0 @@
-# Ruby CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-ruby/ for more details
-#
-version: 2.1
-
-orbs:
-  codeclimate: sue445/codeclimate@volatile
-  slack:       circleci/slack@3
-
-executors:
-  ruby:
-    parameters:
-      tag:
-        type: string
-        default: "latest"
-    docker:
-      - image: ruby:<< parameters.tag >>
-    environment:
-      # c.f. https://github.com/ffaker/ffaker/issues/277#issuecomment-263519146
-      LANG:     en_US.UTF-8
-      LANGUAGE: en_US.UTF-8
-      LC_ALL:   C.UTF-8
-
-      BUNDLE_PATH: vendor/bundle
-      BUNDLE_JOBS: 4
-      CC_TEST_REPORTER_ID: d91e7c9665019f1574eb4c5a3de1547c80bc3062e3c297282f106501a3c5c694
-    working_directory: ~/app
-
-commands:
-  bundle_install:
-    steps:
-      - run: bundle config --local path vendor/bundle
-      - run: bundle install --jobs=4 --retry=3
-
-jobs:
-  rspec:
-    parameters:
-      version:
-        type: string
-    executor:
-      name: ruby
-      tag: << parameters.version >>
-    steps:
-      - checkout
-      - run: ruby --version
-      - run: bundle --version
-      - run: gem --version
-      - bundle_install
-      - codeclimate/with-cc-test-reporter:
-          after_build_args: "--coverage-input-type simplecov"
-          steps:
-            - run: bundle exec rspec
-      - slack/notify-on-failure
-
-  rubocop:
-    executor:
-      name: ruby
-      tag: "2.5"
-
-    steps:
-      - checkout
-      - bundle_install
-      - run: bundle exec rubocop
-      - slack/notify-on-failure
-
-build_jobs: &build_jobs
-  - rspec:
-      matrix:
-        parameters:
-          version:
-            - "2.5"
-            - "2.6"
-            - "2.7"
-            - "3.0"
-            - "3.1"
-            - "3.2"
-  - rubocop
-
-workflows:
-  version: 2
-
-  build:
-    jobs: *build_jobs
-
-  weekly_build:
-    triggers:
-      - schedule:
-          cron: "00 10 * * 5" # JST 19:00 (Fri)
-          filters:
-            branches:
-              only: master
-    jobs: *build_jobs
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..0100e63
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,91 @@
+name: test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+  schedule:
+    - cron: "0 10 * * 5" # JST 19:00 (Fri)
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        ruby:
+          - "2.5"
+          - "2.6"
+          - "2.7"
+          - "3.0"
+          - "3.1"
+          - "3.2"
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: bundle update
+        run: |
+          set -xe
+          bundle config path vendor/bundle
+          bundle update --jobs $(nproc) --retry 3
+
+      - name: Setup Code Climate Test Reporter
+        uses: aktions/codeclimate-test-reporter@v1
+        with:
+          codeclimate-test-reporter-id: ${{ secrets.CC_TEST_REPORTER_ID }}
+          command: before-build
+        continue-on-error: true
+
+      - run: bundle exec rspec
+
+      - name: Teardown Code Climate Test Reporter
+        uses: aktions/codeclimate-test-reporter@v1
+        with:
+          codeclimate-test-reporter-id: ${{ secrets.CC_TEST_REPORTER_ID }}
+          command: after-build
+        if: always()
+        continue-on-error: true
+
+      - run: bundle exec rubocop
+
+      - name: Slack Notification (not success)
+        uses: lazy-actions/slatify@master
+        if: "! success()"
+        continue-on-error: true
+        with:
+          job_name: ${{ format('*build* ({0})', matrix.ruby) }}
+          type: ${{ job.status }}
+          icon_emoji: ":octocat:"
+          url: ${{ secrets.SLACK_WEBHOOK }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  notify:
+    needs:
+      - test
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Slack Notification (success)
+        uses: lazy-actions/slatify@master
+        if: always()
+        continue-on-error: true
+        with:
+          job_name: '*build*'
+          type: ${{ job.status }}
+          icon_emoji: ":octocat:"
+          url: ${{ secrets.SLACK_WEBHOOK }}
+          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index 61540e9..635a965 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 5ch (a.k.a. 2ch) reader via http://itest.5ch.net/
 
 [![Gem Version](https://badge.fury.io/rb/itest5ch.svg)](https://badge.fury.io/rb/itest5ch)
-[![CircleCI](https://circleci.com/gh/sue445/itest5ch/tree/master.svg?style=svg)](https://circleci.com/gh/sue445/itest5ch/tree/master)
+[![test](https://github.com/sue445/itest5ch/actions/workflows/test.yml/badge.svg)](https://github.com/sue445/itest5ch/actions/workflows/test.yml)
 [![Coverage Status](https://coveralls.io/repos/github/sue445/itest5ch/badge.svg)](https://coveralls.io/github/sue445/itest5ch)
 [![Maintainability](https://api.codeclimate.com/v1/badges/14a81b3f7da11e475242/maintainability)](https://codeclimate.com/github/sue445/itest5ch/maintainability)