diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0065836
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,37 @@
+name: MO4 Coding Standard CI
+on:
+  pull_request:
+  push:
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        php_version:
+          - 5.6
+          - 7.0
+          - 7.1
+          - 7.2
+          - 7.3
+          - 7.4
+          - 8.0
+          - 8.1
+          - 8.2
+          - 8.3
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php_version }}
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: '~/.cache/composer'
+          key: "cache-composer-${{ hashFiles('composer.json') }}"
+          restore-keys: 'cache-composer-'
+      - name: Run composer
+        run: composer update --prefer-dist --no-interaction --no-progress
+      - name: Run tests
+        run: ant test -Dcomposer.path=composer
diff --git a/.gitignore b/.gitignore
index 26e3e1c..c0a08fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 cache.properties
 phpunit.xml
+.phpunit.result.cache
 composer.lock
 composer.phar
 vendor/
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 493c273..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,38 +0,0 @@
-language: php
-
-php:
-    - 5.6 # security support until 31/12/2018
-    - 7.0 # security support until 03/12/2018
-    - 7.1 # security support until 01/12/2019
-    - 7.2 # security support until 30/11/2020
-    - 7.3 # security support until 06/12/2021
-    - 7.4 # security support until 28/11/2022
-    - 8.0 # security support until 26/11/2023
-    - nightly
-
-addons:
-  apt:
-    packages:
-      ant
-
-before_script:
-  - stable='^[0-9\.]+$'; if [[ "$TRAVIS_PHP_VERSION" =~ $stable ]]; then phpenv config-rm xdebug.ini; fi
-  - export PATH="$HOME/.composer/vendor/bin:$PATH"
-  # PHPUnit 8.x is not (yet) supported, so prevent issues with Travis images using it.
-  - |
-    if [[ $TRAVIS_PHP_VERSION == "nightly" || $TRAVIS_PHP_VERSION == "8.0" ]]; then
-      travis_retry composer install --ignore-platform-reqs
-    else
-      travis_retry composer install
-    fi
-
-script:
-    - ant test -Dcomposer.path=composer
-
-matrix:
-  allow_failures:
-    - php: nightly
-
-notifications:
-  email:
-    - development@davidjoos.com
diff --git a/composer.json b/composer.json
index 3b44c5d..7a24769 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "squizlabs/php_codesniffer": "^3.3.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.0 || ^6.0 || ^7.0"
+        "phpunit/phpunit": "^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4"
     },
     "conflict": {
         "squizlabs/php_codesniffer": "<3 || >=4"