diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d239c8b..429f08c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,13 +9,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ 7.2., 7.3, 7.4, 8.0 ]
-        contao: [ 4.4.*, 4.9.*, 4.10.* ]
+        php: [ 7.2, 7.3, 7.4, 8.0 ]
+        contao: [ 4.9.*, 4.13.* ]
         exclude:
-          - php: 8.0
-            contao: 4.4.*
           - php: 7.2
-            contao: 4.*
+            contao: 4.13.*
+          - php: 7.3
+            contao: 4.13.*
     steps:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -31,7 +31,7 @@ jobs:
       - name: Install the dependencies
         id: composer-install
         run: composer require contao/core-bundle:${{ matrix.contao }} --no-interaction
-        continue-on-error: ${{ matrix.php == 8.0 }}
+#        continue-on-error: ${{ matrix.contao == 4.13.* }}
 
       - name: Run the unit tests
         if: steps.composer-install.conclusion == 'success' && steps.composer-install.outcome == 'success'
diff --git a/.gitignore b/.gitignore
index 183f2a4..4278fde 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 composer.lock
 .idea
 vendor
+.phpunit.result.cache
+.ddev
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63f4d74..6509a86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.9] - 2022-06-02
+- Fixed: warning in php 8
+
 ## [1.5.8] - 2022-03-25
 - Fixed: exception if the templates folder does not exist ([#8], [@qzminski])
 
diff --git a/composer.json b/composer.json
index 24d09ab..9292b7e 100644
--- a/composer.json
+++ b/composer.json
@@ -19,18 +19,14 @@
     "webmozart/path-util": "^2.3"
   },
   "require-dev": {
-    "contao/test-case": "1.1.*",
-    "contao/core-bundle": ">=4.4.0,<4.11",
+    "contao/core-bundle": "^4.13",
+    "contao/test-case": "^4.9",
     "contao/manager-plugin": "^2.0",
     "friendsofphp/php-cs-fixer": "^2.2",
-    "phpunit/phpunit": "^6.5",
-    "phpunit/phpunit-mock-objects": "^4.0|^5.0",
-    "phpunit/php-token-stream": "^1.4|^2.0|^3.0",
-    "php-http/guzzle6-adapter": "^1.1",
-    "php-http/message-factory": "^1.0.2",
-    "satooshi/php-coveralls": "^2.0",
-    "symfony/phpunit-bridge": "^3.2",
-    "heimrichhannot/contao-test-utilities-bundle": "^0.1.3"
+    "phpunit/phpunit": "^8.0",
+    "php-coveralls/php-coveralls": "^2.0",
+    "symfony/phpunit-bridge": "^4.4 || ^5.4",
+    "heimrichhannot/contao-test-utilities-bundle": "^0.1.5"
   },
   "autoload": {
     "psr-4": {
@@ -44,5 +40,11 @@
   },
   "extra": {
     "contao-manager-plugin": "HeimrichHannot\\TwigSupportBundle\\ContaoManager\\Plugin"
+  },
+  "config": {
+    "allow-plugins": {
+      "contao-components/installer": true,
+      "contao/manager-plugin": true
+    }
   }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 337c4e6..33a4bd5 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -12,7 +12,7 @@
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false"
-        syntaxCheck="false">
+>
     <php>
         <ini name="error_reporting" value="-1"/>
         <ini name="display_errors" value="1"/>
diff --git a/src/Helper/NormalizerHelper.php b/src/Helper/NormalizerHelper.php
index 4db7c88..15560a9 100644
--- a/src/Helper/NormalizerHelper.php
+++ b/src/Helper/NormalizerHelper.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright (c) 2020 Heimrich & Hannot GmbH
+ * Copyright (c) 2022 Heimrich & Hannot GmbH
  *
  * @license LGPL-3.0-or-later
  */
@@ -101,7 +101,7 @@ public function normalizeObject($object, $data = [], $options = []): array
                 $method->setAccessible(true);
                 $data[$property] = $method->invoke($object);
             } else {
-                $data[$property] = $object->{$method->name}();
+                $data[$property] = @$object->{$method->name}();
             }
 
             if (\is_object($data[$property])) {
diff --git a/tests/EventListener/RenderListenerTest.php b/tests/EventListener/RenderListenerTest.php
index 562dc49..2059d73 100644
--- a/tests/EventListener/RenderListenerTest.php
+++ b/tests/EventListener/RenderListenerTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright (c) 2021 Heimrich & Hannot GmbH
+ * Copyright (c) 2022 Heimrich & Hannot GmbH
  *
  * @license LGPL-3.0-or-later
  */
@@ -41,7 +41,7 @@ public function createTestInstance(array $parameters = [], ?MockBuilder $mockBui
 
         if (!isset($parameters['eventDispatcher'])) {
             $eventDispatcher = $this->createMock(EventDispatcherInterface::class);
-            $eventDispatcher->method('dispatch')->willReturnArgument(1);
+            $eventDispatcher->method('dispatch')->willReturnArgument(0);
             $parameters['eventDispatcher'] = $eventDispatcher;
         }
 
@@ -185,7 +185,7 @@ public function testOnParseWidgetSkipTemplates()
     public function testPrepareContaoTemplateSkipOnException()
     {
         $dispatcher = $this->createMock(EventDispatcherInterface::class);
-        $dispatcher->method('dispatch')->willReturnCallback(function ($eventName, BeforeParseTwigTemplateEvent $event) {
+        $dispatcher->method('dispatch')->willReturnCallback(function (BeforeParseTwigTemplateEvent $event, $eventName = '') {
             if ('disabled' === $event->getTemplateName()) {
                 throw new SkipTemplateException('SkipTemplateException');
             }
@@ -217,7 +217,7 @@ public function testPrepareContaoTemplateSkipOnException()
     public function testOnParseWidgetSkipOnException()
     {
         $dispatcher = $this->createMock(EventDispatcherInterface::class);
-        $dispatcher->method('dispatch')->willReturnCallback(function ($eventName, BeforeParseTwigTemplateEvent $event) {
+        $dispatcher->method('dispatch')->willReturnCallback(function (BeforeParseTwigTemplateEvent $event, $eventName = '') {
             if ('form_text' === $event->getTemplateName()) {
                 throw new SkipTemplateException('SkipTemplateException');
             }
diff --git a/tests/Template/TwigFrontendTemplateTest.php b/tests/Template/TwigFrontendTemplateTest.php
index e23c155..02a265f 100644
--- a/tests/Template/TwigFrontendTemplateTest.php
+++ b/tests/Template/TwigFrontendTemplateTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright (c) 2021 Heimrich & Hannot GmbH
+ * Copyright (c) 2022 Heimrich & Hannot GmbH
  *
  * @license LGPL-3.0-or-later
  */
@@ -21,7 +21,7 @@ class TwigFrontendTemplateTest extends ContaoTestCase
     public function testInherit()
     {
         $instance = $this->getMockBuilder(TwigFrontendTemplate::class)->disableOriginalConstructor()->setMethods(null)->getMock();
-        $container = $this->mockContainer();
+        $container = $this->getContainerWithContaoConfiguration();
         System::setContainer($container);
         $this->assertEmpty($instance->inherit());