diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 93dedd5..038ce25 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,11 +10,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '7.4', '8.0', '8.1' ]
-        composer: [ '', '--prefer-lowest' ]
+        php: 
+          - '7.4'
+          - '8.0'
+          - '8.1'
+          - '8.2'
+          - '8.3'
+          - '8.4' 
+        deps:
+          - 'highest' 
+          - 'lowest'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Use PHP
         uses: shivammathur/setup-php@v2
@@ -32,22 +40,22 @@ jobs:
 
       - name: cache dependencies
         id: cache-dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
-          key: ${{ runner.os }}-${{ matrix.php }}-${{ matrix.composer }}-composer-${{ hashFiles('**/composer.lock') }}
+          key: ${{ runner.os }}-${{ matrix.php }}-${{ matrix.deps }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: |
-            ${{ runner.os }}-${{ matrix.php }}-${{ matrix.composer }}-composer-
+            ${{ runner.os }}-${{ matrix.php }}-${{ matrix.deps }}-composer-
 
       - name: Validate composer.json and composer.lock
         run: composer validate
         working-directory: ./
 
       - name: Install dependencies
-        env:
-          COMPOSER_FLAGS: ${{ matrix.composer }}
-        run: composer update ${COMPOSER_FLAGS} --prefer-source
-        working-directory: ./
+        uses: ramsey/composer-install@v3
+        with:
+          dependency-versions: '${{ matrix.deps }}'            
+          working-directory: ./
 
 
       - name: Run Tests
diff --git a/Framework/Test/ServiceTestCase.php b/Framework/Test/ServiceTestCase.php
index 0702a34..7c753a9 100644
--- a/Framework/Test/ServiceTestCase.php
+++ b/Framework/Test/ServiceTestCase.php
@@ -94,7 +94,7 @@ static private function getPhpUnitCliConfigArgument()
      */
     static protected function getKernelClass()
     {
-        $dir = isset($_SERVER['KERNEL_DIR']) ? $_SERVER['KERNEL_DIR'] : static::getPhpUnitXmlDir();
+        $dir = $_SERVER['KERNEL_DIR'] ?? static::getPhpUnitXmlDir();
 
         $finder = new Finder();
         $finder->name('*Kernel.php')->depth(0)->in($dir);
@@ -123,15 +123,15 @@ static protected function getKernelClass()
      *
      * @return HttpKernelInterface A HttpKernelInterface instance
      */
-    static protected function createKernel(array $options = array())
+    static protected function createKernel(array $options = [])
     {
         if (null === static::$class) {
             static::$class = static::getKernelClass();
         }
 
         return new static::$class(
-            isset($options['environment']) ? $options['environment'] : 'test',
-            isset($options['debug']) ? $options['debug'] : true
+            $options['environment'] ?? 'test',
+            $options['debug'] ?? true
         );
     }
 
diff --git a/Tests/TestKernel.php b/Tests/TestKernel.php
index 1ae9ddf..feac284 100644
--- a/Tests/TestKernel.php
+++ b/Tests/TestKernel.php
@@ -11,17 +11,16 @@ public function getRootDir()
     {
         return __DIR__.'/Resources';
     }
-    public function registerBundles()
+    public function registerBundles(): iterable
     {
-        return array(
-        );
+        return [];
     }
     public function registerContainerConfiguration(LoaderInterface $loader)
     {
         $loader->load(__DIR__.'/Resources/config/config_test.yml');
         if (class_exists('Symfony\Component\Asset\Package')) {
             $loader->load(function (ContainerBuilder $container) {
-                $container->loadFromExtension('framework', array('assets' => array()));
+                $container->loadFromExtension('framework', ['assets' => []]);
             });
         }
     }
diff --git a/composer.json b/composer.json
index 1a14f30..84aca20 100644
--- a/composer.json
+++ b/composer.json
@@ -21,13 +21,14 @@
     ],
     "require": {
         "php": ">=7.4",
-        "symfony/http-kernel": "^4.4.12|^5.0",
+        "symfony/http-kernel": "^4.4.12|^5.0|^6.0",
         "phpunit/phpunit": "^8.5.23|^9.0"
     },
     "require-dev": {
-        "symfony/config": "^4.4.12|^5.0",
-        "symfony/dependency-injection": "^4.4.12|^5.0",
-        "symfony/yaml": "^4.4.12|^5.0"
+        "symfony/config": "^4.4.12|^5.0|^6.0",
+        "symfony/dependency-injection": "^4.4.12|^5.0|^6.0",
+        "symfony/yaml": "^4.4.12|^5.0|^6.0",
+        "rector/rector": "^0.19.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index e9230a1..ece7173 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         backupGlobals="false"
          backupStaticAttributes="false"
          colors="true"
          convertErrorsToExceptions="true"
@@ -7,33 +8,28 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
-         bootstrap="Tests/autoload.php">
-
-    <php>
-        <ini name="error_reporting" value="-1"/>
-        <server name="KERNEL_DIR" value="./Tests/" />
-    </php>
-
-    <testsuites>
-        <testsuite name="ServiceTestHelper Test Suite">
-            <directory suffix="Test.php">./Tests</directory>
-        </testsuite>
-    </testsuites>
-
-    <logging>
-        <log type="junit" target="build/logs/junit.xml"
-             logIncompleteSkipped="false"/>
-    </logging>
-
-    <filter>
-        <whitelist>
-            <directory>./</directory>
-            <exclude>
-                <directory>./Tests</directory>
-                <directory>./vendor</directory>
-                <directory>./Resources</directory>
-            </exclude>
-        </whitelist>
-    </filter>
+         bootstrap="Tests/autoload.php"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage>
+    <include>
+      <directory>./</directory>
+    </include>
+    <exclude>
+      <directory>./Tests</directory>
+      <directory>./vendor</directory>
+      <directory>./Resources</directory>
+    </exclude>
+  </coverage>
+  <php>
+    <ini name="error_reporting" value="-1"/>
+    <server name="KERNEL_DIR" value="./Tests/"/>
+  </php>
+  <testsuites>
+    <testsuite name="ServiceTestHelper Test Suite">
+      <directory suffix="Test.php">./Tests</directory>
+    </testsuite>
+  </testsuites>
+  <logging>
+    <junit outputFile="build/logs/junit.xml"/>
+  </logging>
 </phpunit>