diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index a4bef32..175f8ba 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -8,10 +8,18 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
-
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ ubuntu-latest ]
+        php-versions: [ '7.2', '7.3', '8.0' ]
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
       - uses: actions/checkout@v2
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}l
       - name: Install Dependencies
         run: composer install -q --no-ansi --no-interaction --no-scripts --no-suggest --no-progress --prefer-dist
       - name: Execute tests
diff --git a/composer.json b/composer.json
index 9c996ce..32561fd 100644
--- a/composer.json
+++ b/composer.json
@@ -17,12 +17,12 @@
     }
   ],
   "require": {
-    "php": "^7.2",
-    "guzzlehttp/guzzle": "^6.3",
+    "php": "^7.2 || ^7.3 || ^8.0",
+    "guzzlehttp/guzzle": "^6.3 || ^7.0",
     "ext-json": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^5.7 || ^6.5 || ^7.1"
+    "phpunit/phpunit": "^5.7 || ^6.5 || ^7.1 || ^9"
   },
   "config": {
     "sort-packages": true
diff --git a/tests/ApiClientTest.php b/tests/ApiClientTest.php
index 426aee7..948bef1 100644
--- a/tests/ApiClientTest.php
+++ b/tests/ApiClientTest.php
@@ -17,7 +17,7 @@ class ApiClientTest extends TestCase
     /** @var WeFact */
     private $weFact;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
         $this->guzzleClient = $this->createMock(Client::class);