diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
new file mode 100644
index 0000000..edbe004
--- /dev/null
+++ b/.github/workflows/continuous-integration.yml
@@ -0,0 +1,40 @@
+name: Continuous Integration
+on:
+  push: { }
+  pull_request: { }
+  workflow_dispatch: { }
+jobs:
+  test:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ ubuntu-latest ]
+        php-versions:
+          - 7.4
+          - 7.3
+          - 7.2
+          - 7.1
+        phpunit-versions: [ latest ]
+    steps:
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: xdebug
+
+      - uses: actions/checkout@v2
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - run: composer install --prefer-dist
+      - run: composer run cs-check
+      - run: composer run coverage
+
+      - uses: codecov/codecov-action@v2
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 761ee04..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-os: linux
-language: php
-
-php:
-- 5.6
-- 7.0
-- 7.1
-- 7.2
-- 7.3
-- 7.4
-- nightly
-
-jobs:
-  allow_failures:
-  - php: nightly
-
-cache:
-  directories:
-  - $HOME/.composer/cache/files
-  - vendor
-
-install:
-- composer install --prefer-dist
-
-script:
-- composer run cs-check
-- composer run coverage
-
-after_success:
-- bash <(curl -s https://codecov.io/bash)
diff --git a/README.md b/README.md
index c3149b4..cfe06a7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # mitake-php
 
-[![Build Status](https://travis-ci.org/minchao/mitake-php.svg?branch=master)](https://travis-ci.org/minchao/mitake-php)
+[![Continuous Integration](https://github.com/minchao/mitake-php/actions/workflows/continuous-integration.yml/badge.svg?branch=master)](https://github.com/minchao/mitake-php/actions/workflows/continuous-integration.yml)
 [![Build status](https://ci.appveyor.com/api/projects/status/sg0uce4i30p5dxf2/branch/master?svg=true&passingText=Windows%20-%20OK)](https://ci.appveyor.com/project/minchao/mitake-php/branch/master)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/1b7b6ee48e884e6aa48d76605871ba83)](https://www.codacy.com/app/minchao/mitake-php?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=minchao/mitake-php&amp;utm_campaign=Badge_Grade)
 [![codecov](https://codecov.io/gh/minchao/mitake-php/branch/master/graph/badge.svg)](https://codecov.io/gh/minchao/mitake-php)
@@ -82,7 +82,7 @@ $resp = $client->sendLongMessage($message);
 
 ### 發送多筆長簡訊
 
-若要一次發送多筆長簡訊，請先建立欲發送的 **LongMessage objects** 陣列，再呼叫 API 的 sendLongMessageBatch() 方法發送 
+若要一次發送多筆長簡訊，請先建立欲發送的 **LongMessage objects** 陣列，再呼叫 API 的 sendLongMessageBatch() 方法發送
 
 ```php
 $resp = $client->sendLongMessageBatch([$message1, $message2]);
@@ -113,7 +113,7 @@ $resp = $client->cancelMessageStatus(['MESSAGE_ID1', 'MESSAGE_ID2]);
 
 ```php
 $message->setResponse('https://your.domain.name/callback');
-``` 
+```
 
 建立 webhook：
 
@@ -214,7 +214,7 @@ Q：遇到 `PHP Fatal error: Uncaught GuzzleHttp\Exception\ConnectException: cUR
 
 A：這是因為 OpenSSL 已不支援 TLS 1.1 以下版本，建議使用[長簡訊方法](https://github.com/minchao/mitake-php#%E7%99%BC%E9%80%81%E5%96%AE%E7%AD%86%E9%95%B7%E7%B0%A1%E8%A8%8A)來傳送簡訊，請參考 Issue [#4](https://github.com/minchao/mitake-php/issues/4) 的說明。
 
-**注意：使用 HTTP 或已棄用的 TLS 協議來傳送簡訊，會將傳輸資料暴露外洩的風險之中。** 
+**注意：使用 HTTP 或已棄用的 TLS 協議來傳送簡訊，會將傳輸資料暴露外洩的風險之中。**
 
 ## License
 
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index c7d5991..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,66 +0,0 @@
-build: false
-platform:
-  - x64
-clone_folder: c:\projects\mitake-php
-
-## Build matrix
-environment:
-  matrix:
-  - dependencies: highest
-    php_version: 7.0
-  - dependencies: highest
-    php_version: 7.1
-  - dependencies: highest
-    php_version: 7.2
-
-  project_directory: c:\projects\mitake-php
-  php_root_directory: c:\tools\php
-  composer_directory: c:\tools\composer
-  composer_executable: c:\tools\composer\composer.phar
-
-cache:
-  - c:\ProgramData\chocolatey\bin -> appveyor.yml
-  - c:\ProgramData\chocolatey\lib -> appveyor.yml
-  - c:\tools\php -> appveyor.yml
-  - c:\tools\composer -> appveyor.yml
-  - '%LOCALAPPDATA%\Composer -> appveyor.yml'
-
-init:
-  - ps: $Env:php_directory = $Env:php_root_directory + '\' + $Env:php_version
-  - ps: $Env:exact_php_version = (((choco search php --exact --all-versions --limit-output | Select-String -pattern $Env:php_version) -replace '[php|]', '') | %{ New-Object System.Version $_ } | Sort-Object | Select-Object -Last 1).ToString()
-  - ps: $Env:PATH = $Env:php_directory + ';' + $Env:composer_directory + ';' + $Env:PATH
-  - ps: $Env:ANSICON = '121x90 (121x90)'
-
-install:
-  # Install requested PHP version
-  - ps: If ((Test-Path $Env:php_directory) -eq $False) { New-Item -Path $Env:php_directory -ItemType 'directory' }
-  - ps: $php_install_parameters = '"/DontAddToPath /InstallDir:' + $Env:php_directory + '"'
-  - ps: appveyor-retry choco upgrade php --yes --version=$Env:exact_php_version --params=$php_install_parameters
-
-  # Prepare PHP
-  - ps: cd $Env:php_directory
-  - ps: Copy-Item php.ini-production -Destination php.ini
-  - ps: Add-Content -Path php.ini -Value 'memory_limit=1G'
-  - ps: Add-Content -Path php.ini -Value 'date.timezone="UTC"'
-  - ps: Add-Content -Path php.ini -Value 'extension_dir=ext'
-  - ps: Add-Content -Path php.ini -Value 'extension=php_curl.dll'
-  - ps: Add-Content -Path php.ini -Value 'extension=php_intl.dll'
-  - ps: Add-Content -Path php.ini -Value 'extension=php_mbstring.dll'
-  - ps: Add-Content -Path php.ini -Value 'extension=php_openssl.dll'
-  - ps: php --version
-
-  # Prepare composer
-  - ps: If ((Test-Path $Env:composer_directory) -eq $False) { New-Item -Path $Env:composer_directory -ItemType 'directory' }
-  - ps: If ((Test-Path $Env:composer_executable) -eq $False) { appveyor-retry appveyor DownloadFile https://getcomposer.org/composer.phar -FileName $Env:composer_executable }
-  - ps: Set-Content -Path ($Env:composer_directory + '\composer.bat') -Value ('@php ' + $Env:composer_executable + ' %*')
-  - composer self-update
-
-  # Install dependencies
-  - ps: cd $Env:project_directory
-  - IF %dependencies%==highest composer update --no-interaction --no-progress
-
-test_script:
-  - ps: cd $Env:project_directory
-  - composer run cs-check
-  - composer run coverage
-