diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..b18fd29
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
deleted file mode 100644
index c01a31f..0000000
--- a/.github/workflows/macos.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-name: Testing on macOS
-on:
-  - push
-  - pull_request
-jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        ruby: [ '2.4', '2.5', '2.6', '2.7' ]
-        os:
-          - macOS-latest
-    name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v2
-    - uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
-    - name: unit testing
-      env:
-        CI: true
-      run: |
-        gem install bundler rake
-        bundle install --jobs 4 --retry 3
-        bundle exec rake test
diff --git a/.github/workflows/linux.yml b/.github/workflows/unit-test.yml
similarity index 66%
rename from .github/workflows/linux.yml
rename to .github/workflows/unit-test.yml
index ccb779e..2860c51 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/unit-test.yml
@@ -1,4 +1,4 @@
-name: Test on Ubuntu
+name: Test
 on:
   push:
     branches: [master]
@@ -10,9 +10,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.1', '3.0', '2.7', '2.6' ]
-        os:
-          - ubuntu-latest
+        ruby: [ '3.2', '3.1', '3.0', '2.7' ]
+        os: [ 'ubuntu-latest', 'macOS-latest', 'windows-latest' ]
+        # It should be removed after RubyInstaller 3.2 is available on setup-ruby
+        exclude:
+          - os: windows-latest
+            ruby: 3.2
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 942135d..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-sudo: false
-language: ruby
-
-rvm:
-  - 2.4
-  - 2.5.3
-  - 2.6.0
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 37c89a0..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-version: '{build}'
-
-# init:
-#   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
-
-install:
-  - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
-  - ruby --version
-  - gem --version
-  - ridk.cmd exec bundle install
-build: off
-test_script:
-  - bundle exec rake test
-
-# https://www.appveyor.com/docs/installed-software/#ruby
-environment:
-  matrix:
-    - ruby_version: "26-x64"
-    - ruby_version: "26"
-    - ruby_version: "25-x64"
-    - ruby_version: "25"
-    - ruby_version: "24-x64"
-    - ruby_version: "24"