diff --git a/.github/workflows/tasks.yml b/.github/workflows/tasks.yml
index ec17e3c..fcdc2c2 100644
--- a/.github/workflows/tasks.yml
+++ b/.github/workflows/tasks.yml
@@ -4,19 +4,30 @@ on: [push, pull_request]
 
 jobs:
   lint-php:
-    name: Linting php with grumphp
+    name: "php: ${{ matrix.php }} TYPO3: ${{ matrix.typo3 }}"
     runs-on: ubuntu-latest
-    container:
-      image: kanti/buildy:7.4
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '8.1', '8.2', '8.3' ]
+        typo3: [ '11', '12' ]
+        exclude:
+          - php: '8.1'
+            typo3: '13'
     steps:
+      - name: Setup PHP with PECL extension
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
       - uses: actions/checkout@v2
       - uses: actions/cache@v2
         with:
           path: ~/.composer/cache/files
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          key: ${{ runner.os }}-${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: |
-            ${{ runner.os }}-composer-
-      - run: composer install --no-interaction --no-progress --ignore-platform-req=ext*
+            ${{ runner.os }}-${{ matrix.php }}-composer-
+      - run: composer require typo3/minimal="^${{ matrix.typo3 }}" -W --dev
+      - run: composer install --no-interaction --no-progress
       - run: ./vendor/bin/grumphp run --ansi
 
   ter-release:
@@ -40,7 +51,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.4'
+          php-version: '8.1'
           extensions: intl, mbstring, xml, soap, zip, curl
           tools: composer
 
diff --git a/.gitignore b/.gitignore
index 42c24f1..756ae3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 composer.lock
 public/
 vendor/
+var/
diff --git a/Classes/Cache/ClearCache.php b/Classes/Cache/ClearCache.php
new file mode 100644
index 0000000..84cc4f7
--- /dev/null
+++ b/Classes/Cache/ClearCache.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AUS\SsiInclude\Cache;
+
+use AUS\SsiInclude\ViewHelpers\RenderIncludeViewHelper;
+use TYPO3\CMS\Core\Core\Environment;
+
+class ClearCache
+{
+    /** @param array<mixed> $parameters */
+    public function clearCache(array $parameters): void
+    {
+        if (isset($parameters['cacheCmd']) && ($parameters['cacheCmd'] === 'pages' || $parameters['cacheCmd'] === 'all')) {
+            $path = Environment::getPublicPath() . RenderIncludeViewHelper::SSI_INCLUDE_DIR;
+            $this->removeFiles($path);
+        }
+    }
+
+    protected function removeFiles(string $dir): void
+    {
+        if (is_dir($dir)) {
+            $objects = scandir($dir);
+            if (!$objects) {
+                return;
+            }
+
+            foreach ($objects as $object) {
+                if ($object !== '.' && $object !== '..') {
+                    $filePath = $dir . DIRECTORY_SEPARATOR . $object;
+                    if (is_file($filePath) && is_writable($filePath)) {
+                        unlink($filePath);
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/Classes/Event/RenderedEvent.php b/Classes/Event/RenderedEvent.php
index 222342d..ec522dc 100644
--- a/Classes/Event/RenderedEvent.php
+++ b/Classes/Event/RenderedEvent.php
@@ -6,11 +6,8 @@
 
 class RenderedEvent
 {
-    protected string $html;
-
-    public function __construct(string $html)
+    public function __construct(protected string $html)
     {
-        $this->html = $html;
     }
 
     public function getHtml(): string
diff --git a/Classes/Middleware/InternalSsiRedirectMiddleware.php b/Classes/Middleware/InternalSsiRedirectMiddleware.php
index a78f031..858bf34 100644
--- a/Classes/Middleware/InternalSsiRedirectMiddleware.php
+++ b/Classes/Middleware/InternalSsiRedirectMiddleware.php
@@ -18,17 +18,20 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
     {
         if (isset($request->getQueryParams()['ssi_include'])) {
             $ssiInclude = $request->getQueryParams()['ssi_include'];
-            if (!preg_match('/^([a-zA-Z0-9_]+)$/', $ssiInclude)) {
+            if (!preg_match('/^(\w+)$/', (string) $ssiInclude)) {
                 return new HtmlResponse('ssi_include invalid', 400);
             }
+
             $cacheFileName = RenderIncludeViewHelper::SSI_INCLUDE_DIR . $ssiInclude;
             $absolutePath = Environment::getPublicPath() . $cacheFileName;
             if (!file_exists($absolutePath)) {
                 // ignore response use the content of the file:
                 $handler->handle($request->withAttribute('noCache', true));
             }
+
             return new HtmlResponse(file_get_contents($absolutePath) ?: '');
         }
+
         return $handler->handle($request);
     }
 }
diff --git a/Classes/Utility/VersionUtility.php b/Classes/Utility/VersionUtility.php
index 056a16e..2d967dd 100644
--- a/Classes/Utility/VersionUtility.php
+++ b/Classes/Utility/VersionUtility.php
@@ -18,7 +18,7 @@ public static function getVersion(): string
         $str = 'dev';
         try {
             return explode('@', Versions::getVersion('andersundsehr/ssi-include'))[0] ?? $str;
-        } catch (Throwable $e) {
+        } catch (Throwable) {
             return $str;
         }
     }
diff --git a/Classes/ViewHelpers/RenderIncludeViewHelper.php b/Classes/ViewHelpers/RenderIncludeViewHelper.php
index 1853510..9daca3d 100644
--- a/Classes/ViewHelpers/RenderIncludeViewHelper.php
+++ b/Classes/ViewHelpers/RenderIncludeViewHelper.php
@@ -4,6 +4,8 @@
 
 namespace AUS\SsiInclude\ViewHelpers;
 
+use Webimpress\SafeWriter\Exception\ExceptionInterface;
+use Closure;
 use AUS\SsiInclude\Event\RenderedEvent;
 use Exception;
 use TYPO3\CMS\Core\Context\Context;
@@ -33,14 +35,12 @@ public function initializeArguments(): void
 
     /**
      * @param array<string, mixed> $arguments
-     * @param \Closure $renderChildrenClosure
-     * @param RenderingContextInterface $renderingContext
-     * @return string
-     * @throws \Webimpress\SafeWriter\Exception\ExceptionInterface
+     * @throws Exception
+     * @throws ExceptionInterface
      */
-    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext): string
+    public static function renderStatic(array $arguments, Closure $renderChildrenClosure, RenderingContextInterface $renderingContext): string
     {
-        $name = static::validateName($arguments);
+        $name = self::validateName($arguments);
 
         $filename = static::getSiteName() . '_' . static::getLangauge() . '_' . $name;
         $basePath = self::SSI_INCLUDE_DIR . $filename;
@@ -56,10 +56,11 @@ public static function renderStatic(array $arguments, \Closure $renderChildrenCl
             $eventDispatcher->dispatch($renderedHtmlEvent);
             $html = $renderedHtmlEvent->getHtml();
 
-            @mkdir(dirname($absolutePath), octdec($GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask']), true);
+            @mkdir(dirname($absolutePath), (int)octdec((string)$GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask']), true);
             FileWriter::writeFile($absolutePath, $html);
             GeneralUtility::fixPermissions($absolutePath);
         }
+
         return '<!--# include wait="yes" virtual="' . $basePath . '?ssi_include=' . $filename . '" -->';
     }
 
@@ -68,25 +69,24 @@ private static function shouldRenderFile(string $absolutePath, int $cacheLifeTim
         if (!file_exists($absolutePath)) {
             return true;
         }
+
         if ((filemtime($absolutePath) + $cacheLifeTime) < time()) {
             return true;
         }
-        if (self::isBackendUser()) {
-            return true;
-        }
-        return false;
+
+        return self::isBackendUser();
     }
 
     /**
      * @param array<string, mixed> $arguments
-     * @return string
      * @throws Exception
      */
     private static function validateName(array $arguments): string
     {
-        if (ctype_alnum($arguments['name'])) {
+        if (ctype_alnum((string) $arguments['name'])) {
             return $arguments['name'];
         }
+
         throw new Exception(sprintf('Only Alphanumeric characters allowed got: "%s"', $arguments['name']));
     }
 
diff --git a/Configuration/RequestMiddlewares.php b/Configuration/RequestMiddlewares.php
index cfa41fe..f503e75 100644
--- a/Configuration/RequestMiddlewares.php
+++ b/Configuration/RequestMiddlewares.php
@@ -1,9 +1,11 @@
 <?php
 
+use AUS\SsiInclude\Middleware\InternalSsiRedirectMiddleware;
+
 return [
     'frontend' => [
-        \AUS\SsiInclude\Middleware\InternalSsiRedirectMiddleware::class => [
-            'target' => \AUS\SsiInclude\Middleware\InternalSsiRedirectMiddleware::class,
+        InternalSsiRedirectMiddleware::class => [
+            'target' => InternalSsiRedirectMiddleware::class,
             'before' => [
                 'typo3/cms-core/normalized-params-attribute'
             ],
diff --git a/composer.json b/composer.json
index c337fb7..e6a0b66 100644
--- a/composer.json
+++ b/composer.json
@@ -1,8 +1,8 @@
 {
   "name": "andersundsehr/ssi-include",
   "description": "Allows to periodically create ssi includes from anders und sehr GmbH",
-  "type": "typo3-cms-extension",
   "license": "GPL-3.0-or-later",
+  "type": "typo3-cms-extension",
   "authors": [
     {
       "name": "Matthias Vogel",
@@ -10,48 +10,44 @@
       "homepage": "https://andersundsehr.com"
     }
   ],
+  "require": {
+    "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
+    "ocramius/package-versions": "^2.1.0",
+    "typo3/cms-fluid": "^10.4.0 || ^11.5.0 || ^12.4.0",
+    "typo3/cms-frontend": "^10.4.0 || ^11.5.0 || ^12.4.0",
+    "webimpress/safe-writer": "^2.2.0"
+  },
+  "require-dev": {
+    "composer/composer": "^2.5.5",
+    "pluswerk/grumphp-config": "^7.0",
+    "saschaegerer/phpstan-typo3": "^1.10.0",
+    "ssch/typo3-rector": "^2.5.0"
+  },
   "replace": {
     "typo3-ter/ssi-include": "self.version"
   },
-  "extra": {
-    "typo3/cms": {
-      "extension-key": "ssi_include"
-    },
-    "pluswerk/grumphp-config": {
-      "auto-setting": true
-    },
-    "grumphp": {
-      "config-default-path": "vendor/pluswerk/grumphp-config/grumphp.yml"
+  "autoload": {
+    "psr-4": {
+      "AUS\\SsiInclude\\": "Classes/"
     }
   },
   "config": {
-    "sort-packages": true,
     "allow-plugins": {
+      "ergebnis/composer-normalize": true,
       "phpro/grumphp": true,
-      "typo3/class-alias-loader": true,
-      "typo3/cms-composer-installers": true,
+      "phpstan/extension-installer": true,
       "pluswerk/grumphp-config": true,
-      "phpstan/extension-installer": true
-    }
+      "typo3/class-alias-loader": true,
+      "typo3/cms-composer-installers": true
+    },
+    "sort-packages": true
   },
-  "autoload": {
-    "psr-4": {
-      "AUS\\SsiInclude\\": "Classes/"
+  "extra": {
+    "typo3/cms": {
+      "extension-key": "ssi_include"
     }
   },
   "ter-require": {
     "webimpress/safe-writer": "^2.2.0"
-  },
-  "require": {
-    "php": "~7.4.0 || ~8.0.0 || ~8.1.0 || ~8.2.0",
-    "ocramius/package-versions": "^2.1.0",
-    "typo3/cms-fluid": "^10.4.0 || ^11.5.0 || ^12.4.0",
-    "typo3/cms-frontend": "^10.4.0 || ^11.5.0 || ^12.4.0",
-    "webimpress/safe-writer": "^2.2.0"
-  },
-  "require-dev": {
-    "phpstan/extension-installer": "^1.1.0",
-    "pluswerk/grumphp-config": "^5.0",
-    "saschaegerer/phpstan-typo3": "^0.13.3"
   }
 }
diff --git a/ext_emconf.php b/ext_emconf.php
index f995f6f..d5190fc 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -1,5 +1,7 @@
 <?php
 
+use AUS\SsiInclude\Utility\VersionUtility;
+
 /** @var string $_EXTKEY */
 $EM_CONF[$_EXTKEY] = [
     'title' => 'SSI Include - Render your includes',
@@ -10,7 +12,7 @@
     'author_company' => 'anders und sehr GmbH',
     'state' => 'stable',
     'clearCacheOnLoad' => 0,
-    'version' => \AUS\SsiInclude\Utility\VersionUtility::getVersion(),
+    'version' => VersionUtility::getVersion(),
     'constraints' => [
         'depends' => [
             'typo3' => '10.4.0-11.99.99',
diff --git a/ext_localconf.php b/ext_localconf.php
index 82517ea..ca4e54f 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -1,6 +1,10 @@
 <?php
 
+use AUS\SsiInclude\Cache\ClearCache;
+
 if (!defined('TYPO3_COMPOSER_MODE')) {
     // include autoload if this is the TER version
     require __DIR__ . '/vendor/autoload.php';
 }
+
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc'][] = ClearCache::class . '->clearCache';
diff --git a/grumphp.yml b/grumphp.yml
new file mode 100644
index 0000000..3a60a5a
--- /dev/null
+++ b/grumphp.yml
@@ -0,0 +1,16 @@
+imports:
+  - { resource: vendor/pluswerk/grumphp-config/grumphp.yml }
+parameters:
+  convention.process_timeout: 240
+  convention.security_checker_blocking: true
+  convention.jsonlint_ignore_pattern: {  }
+  convention.xmllint_ignore_pattern: {  }
+  convention.yamllint_ignore_pattern: {  }
+  convention.phpcslint_ignore_pattern: {  }
+  convention.phpcslint_exclude: {  }
+  convention.xlifflint_ignore_pattern: {  }
+  convention.rector_ignore_pattern: {  }
+  convention.rector_enabled: true
+  convention.rector_config: rector.php
+  convention.rector_clear-cache: false
+  convention.phpstan_level: null
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 0000000..9631d44
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1 @@
+parameters:
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..e178ba6
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,7 @@
+includes:
+  - phpstan-baseline.neon
+  - vendor/andersundsehr/phpstan-git-files/extension.php
+
+parameters:
+  level: 8
+  reportUnmatchedIgnoredErrors: false
diff --git a/rector.php b/rector.php
new file mode 100644
index 0000000..0f267f7
--- /dev/null
+++ b/rector.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+use PLUS\GrumPHPConfig\RectorSettings;
+use Rector\Config\RectorConfig;
+use Rector\Caching\ValueObject\Storage\FileCacheStorage;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->parallel();
+    $rectorConfig->importNames();
+    $rectorConfig->importShortClasses();
+    $rectorConfig->cacheClass(FileCacheStorage::class);
+    $rectorConfig->cacheDirectory('./var/cache/rector');
+
+    $rectorConfig->paths(
+        array_filter(explode("\n", (string)shell_exec("git ls-files | xargs ls -d 2>/dev/null | grep -E '\.(php)$'")))
+    );
+
+    // define sets of rules
+    $rectorConfig->sets(
+        [
+            ...RectorSettings::sets(true),
+            ...RectorSettings::setsTypo3(false),
+        ]
+    );
+
+    // remove some rules
+    // ignore some files
+    $rectorConfig->skip(
+        [
+            ...RectorSettings::skip(),
+            ...RectorSettings::skipTypo3(),
+
+            /**
+             * rector should not touch these files
+             */
+            //__DIR__ . '/src/Example',
+            //__DIR__ . '/src/Example.php',
+        ]
+    );
+};