diff --git a/.gitignore b/.gitignore
index ff72e2d..5e0f179 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /composer.lock
 /vendor
+.phpunit.result.cache
diff --git a/Tests/DependencyInjection/KPhoenRulerZExtensionTest.php b/Tests/DependencyInjection/KPhoenRulerZExtensionTest.php
index 80fa669..4979c56 100644
--- a/Tests/DependencyInjection/KPhoenRulerZExtensionTest.php
+++ b/Tests/DependencyInjection/KPhoenRulerZExtensionTest.php
@@ -8,17 +8,15 @@
 use org\bovigo\vfs\vfsStream;
 
 use KPhoen\RulerZBundle\DependencyInjection\KPhoenRulerZExtension;
+use org\bovigo\vfs\vfsStreamDirectory;
 use Symfony\Bridge\RulerZ\Validator\Constraints\RuleValidator;
 use RulerZ\RulerZ;
 
 class KPhoenRulerZExtensionTest extends AbstractExtensionTestCase
 {
-    /**
-     * @var \org\bovigo\vfs\vfsStreamDirectory
-     */
-    protected $root;
+    protected vfsStreamDirectory $root;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
@@ -26,12 +24,12 @@ public function setUp()
         $this->setParameter('kernel.debug', true);
     }
 
-    protected function getContainerExtensions()
+    protected function getContainerExtensions(): array
     {
         return [new KPhoenRulerZExtension()];
     }
 
-    protected function getMinimalConfiguration()
+    protected function getMinimalConfiguration(): array
     {
         return [
             'cache' => $this->root->url().'/cache',
@@ -61,12 +59,10 @@ public function testItCreatesTheCacheDirectory()
         $this->assertTrue(is_dir($this->root->url().'/cache'));
     }
 
-    /**
-     * @expectedException        \RuntimeException
-     * @expectedExceptionMessage Could not create cache directory
-     */
     public function testItThrowsIfTheCacheDirectoryCanNotBeCreated()
     {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage("Could not create cache directory");
         $this->root = vfsStream::setup('rulerz_bundle', 0);
 
         $this->load();
@@ -86,11 +82,9 @@ public function testItLoadsTargetsDefinedInTheConfig()
         $this->assertContainerBuilderNotHasService('rulerz.target.elastica');
     }
 
-    /**
-     * @expectedException \Symfony\Component\Config\Definition\Exception\InvalidConfigurationException
-     */
     public function testUnknownTargetsCantBeLoaded()
     {
+        $this->expectException(\Symfony\Component\Config\Definition\Exception\InvalidConfigurationException::class);
         $this->load([
             'targets' => [
                 'unknown' => null,
diff --git a/composer.json b/composer.json
index 09f12e4..4cd2ee8 100644
--- a/composer.json
+++ b/composer.json
@@ -14,14 +14,17 @@
         "php": ">=7.1",
         "redeye/rulerz-bridge": "^3.0",
         "redeye/rulerz": "^2.0",
-        "symfony/config": "^4.4|^5.0",
-        "symfony/framework-bundle": "^4.4|^5.0"
+        "symfony/config": "^4.4|^5.0|^6.0",
+        "symfony/framework-bundle": "^4.4|^5.0|^6.0"
     },
     "require-dev": {
         "liip/rmt": "^1.2",
         "matthiasnoback/symfony-dependency-injection-test": "^4.1",
         "mikey179/vfsstream": "^1.6",
-        "phpunit/phpunit": "^7.1",
-        "symfony/phpunit-bridge": "^4.4|^5.0"
-    }
+        "phpunit/phpunit": "^7.1|^8.0",
+        "symfony/phpunit-bridge": "^4.4|^5.0|^6.0"
+    },
+    "repositories": [
+        { "type": "composer", "url": "https://repo.packagist.com/rdey/" }
+    ]
 }