diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..559f37d
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  PHPUnit:
+    name: PHPUnit (PHP ${{ matrix.php }})
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php:
+          - 7.4
+          - 7.3
+          - 7.2
+          - 7.1
+          - 5.6
+          - 5.5
+          - 5.4
+          - 5.3
+    steps:
+      - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+      - run: composer install
+      - run: vendor/bin/phpunit --coverage-text
diff --git a/.gitignore b/.gitignore
index 22d0d82..c8153b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-vendor
+/composer.lock
+/vendor/
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 077c106..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-language: php
-
-php:
-  - 5.3
-  - 5.4
-  - 5.5
-
-before_script:
-  - curl -s http://getcomposer.org/installer | php
-  - php composer.phar install --dev
-
-script: phpunit --coverage-text
diff --git a/README.md b/README.md
index fb8be9b..1e46bd9 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Async utilities for React.
 
 It is heavily influenced by [async.js](https://github.com/caolan/async).
 
-[![Build Status](https://secure.travis-ci.org/reactphp/async.png?branch=master)](http://travis-ci.org/reactphp/async)
+[![CI status](https://github.com/reactphp/async/workflows/CI/badge.svg)](https://github.com/reactphp/async/actions)
 
 ## About
 
@@ -118,9 +118,18 @@ $loop->run();
 
 ## Tests
 
-To run the test suite, you need PHPUnit.
+To run the test suite, you first need to clone this repo and then install all
+dependencies [through Composer](https://getcomposer.org/):
 
-    $ phpunit
+```bash
+$ composer install
+```
+
+To run the test suite, go to the project root and run:
+
+```bash
+$ php vendor/bin/phpunit
+```
 
 ## License
 
diff --git a/composer.json b/composer.json
index 6e98d55..3977ee7 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
         "php": ">=5.3.2"
     },
     "require-dev": {
+        "phpunit/phpunit": "^5.7 || ^4.8.35",
         "react/event-loop": "0.2.*"
     },
     "suggest": {
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index d7a52c6..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-    "hash": "b960de93e5fdde7636532a3c5c3bf373",
-    "packages": [
-
-    ],
-    "packages-dev": [
-        {
-            "name": "react/event-loop",
-            "version": "v0.2.7",
-            "target-dir": "React/EventLoop",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/reactphp/event-loop",
-                "reference": "v0.2.7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://github.com/reactphp/event-loop/archive/v0.2.7.zip",
-                "reference": "v0.2.7",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-libev": "*",
-                "ext-libevent": ">=0.0.5"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "0.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "React\\EventLoop": ""
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "description": "Event loop abstraction layer that libraries can use for evented I/O.",
-            "keywords": [
-                "event-loop"
-            ],
-            "time": "2013-01-05 11:41:26"
-        }
-    ],
-    "aliases": [
-
-    ],
-    "minimum-stability": "stable",
-    "stability-flags": [
-
-    ],
-    "platform": {
-        "php": ">=5.3.2"
-    },
-    "platform-dev": [
-
-    ]
-}
diff --git a/tests/React/Tests/Async/TestCase.php b/tests/React/Tests/Async/TestCase.php
index e7f210a..43a68e4 100644
--- a/tests/React/Tests/Async/TestCase.php
+++ b/tests/React/Tests/Async/TestCase.php
@@ -6,7 +6,7 @@ class TestCase extends \PHPUnit_Framework_TestCase
 {
     protected function createCallableMock($expects, $with = null)
     {
-        $callable = $this->getMock('React\Tests\Async\CallableStub');
+        $callable = $this->getMockBuilder('React\Tests\Async\CallableStub')->getMock();
 
         $method = $callable
             ->expects($expects)

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