diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
new file mode 100644
index 0000000..ae4e79a
--- /dev/null
+++ b/.github/workflows/phpunit-tests.yml
@@ -0,0 +1,46 @@
+name: PHPUnit Tests
+
+on:
+  push:
+    branches: master
+    paths:
+      - '**.php'
+      - 'phpunit.xml.dist'
+      - '**.neon'
+      - 'composer.json'
+      - '.github/workflows/phpunit-tests.yml'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '**.php'
+      - 'phpunit.xml.dist'
+      - '**.neon'
+      - 'composer.json'
+      - '.github/workflows/phpunit-tests.yml'
+  workflow_dispatch:
+
+jobs:
+  testing:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-version: [7.4, 8.4]
+
+    steps:
+      - name: Check out the source code
+        uses: actions/checkout@v4
+
+      - name: Set up PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          php-version: ${{ matrix.php-version }}
+
+      - name: Install PHP Dependencies
+        uses: ramsey/composer-install@v3
+        with:
+          dependency-versions: 'highest'
+
+      - name: Run PHPUnit tests
+        run: composer test
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 1b0462d..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-# TravisCI configuration for polylang/polylang-phpstan
-
-if: "branch = master"
-
-language: "php"
-os:
-  - "linux"
-dist: "bionic"
-
-jobs:
-  include:
-    - name: "PHPUnit - PHP 7.4"
-      php: "7.4"
-
-cache:
-  directories:
-    - "${HOME}/.composer/cache"
-
-before_install:
-  - "phpenv config-rm xdebug.ini"
-  - "export PATH=\"$(composer config --absolute --global bin-dir):${PATH}\""
-
-install:
-  - "composer update"
-
-script:
-  - "vendor/bin/phpunit --verbose"
-
-notifications:
-  email:
-    on_success: "never"
-    on_failure: "change"
-  slack:
-    rooms:
-      - secure: "Ydrk6ilDyS5ymD1qGnHlRYIyyTNnZjjM2ZS7HK/D0n/FXCWNHeOxPzEiyO2QZ5eEtREuceKGBfPiDe
-      +cG3P4x6kQvS8w8p62hrlMapOJQF2jCxVlczhQmbFgv8FFlKHwyfVhrIGDitDCa+rAzsBRS/cIm6C9YzQ1BQ7zbF2Mfr0c/1hVQ
-      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"
diff --git a/composer.json b/composer.json
index 2283428..f71a366 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,8 @@
 		"szepeviktor/phpstan-wordpress": "^1.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^7 || ^9"
+		"phpunit/phpunit": "^7 || ^9",
+		"wpsyntex/polylang-stubs": "dev-master"
 	},
 	"autoload": {
 		"psr-4": {
@@ -16,6 +17,6 @@
 		}
 	},
 	"scripts": {
-		"test":"vendor/bin/phpunit"
+		"test":"vendor/bin/phpunit -d memory_limit=1G"
 	}
 }
diff --git a/tests/DynamicReturnTypeExtensionTest.php b/tests/DynamicReturnTypeExtensionTest.php
index 661a9d8..74def12 100644
--- a/tests/DynamicReturnTypeExtensionTest.php
+++ b/tests/DynamicReturnTypeExtensionTest.php
@@ -29,7 +29,7 @@ public function testFileAsserts(string $assertType, string $file, ...$args): voi
 
 	public static function getAdditionalConfigFiles(): array
 	{
-		// path to your project's phpstan.neon, or extension.neon in case of custom extension packages
+		// phpstan.neon or extension.neon use relative paths, so we need to use a fake vendor directory regarding szepeviktor/phpstan-wordpress dependency.
 		return [dirname(__DIR__) . '/vendor/wpsyntex/polylang-phpstan/extension.neon'];
 	}
 }
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index d53442e..dab0cc5 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -11,11 +11,9 @@
 if (! is_dir($helperDirectory)) {
 	mkdir($helperDirectory, 0777, true);
 }
-if ( ! file_exists( $helperDirectory . '/extension.neon' ) ) {
-	copy(dirname(__DIR__) . '/extension.neon', $helperDirectory . '/extension.neon');
-}
-if ( ! file_exists( $helperDirectory . '/bootstrap.php' ) ) {
-	copy(dirname(__DIR__) . '/bootstrap.php', $helperDirectory . '/bootstrap.php');
-}
+
+// Copy package to a fake vendor directory.
+copy(dirname(__DIR__) . '/extension.neon', $helperDirectory . '/extension.neon');
+copy(dirname(__DIR__) . '/bootstrap.php', $helperDirectory . '/bootstrap.php');
 
 require_once dirname(__DIR__) . '/vendor/autoload.php';