diff --git a/Tests/Application/config/bootstrap.php b/Tests/Application/config/bootstrap.php
index 7314acf..36801a1 100644
--- a/Tests/Application/config/bootstrap.php
+++ b/Tests/Application/config/bootstrap.php
@@ -35,5 +35,5 @@
 }
 
 $_SERVER['APP_ENV'] = $_ENV['APP_ENV'] = ($_SERVER['APP_ENV'] ?? $_ENV['APP_ENV'] ?? null) ?: 'dev';
-$_SERVER['APP_DEBUG'] = $_SERVER['APP_DEBUG'] ?? $_ENV['APP_DEBUG'] ?? 'prod' !== $_SERVER['APP_ENV'];
+$_SERVER['APP_DEBUG'] ??= $_ENV['APP_DEBUG'] ?? 'prod' !== $_SERVER['APP_ENV'];
 $_SERVER['APP_DEBUG'] = $_ENV['APP_DEBUG'] = (int) $_SERVER['APP_DEBUG'] || \filter_var($_SERVER['APP_DEBUG'], \FILTER_VALIDATE_BOOLEAN) ? '1' : '0';
diff --git a/composer.json b/composer.json
index 2e7a829..d7ed68e 100644
--- a/composer.json
+++ b/composer.json
@@ -44,6 +44,7 @@
         "phpstan/phpstan-webmozart-assert": "^1.2",
         "phpunit/phpunit": "^10.0",
         "qossmic/deptrac": "^1.0",
+        "rector/rector": "^1.0",
         "symfony/dotenv": "^6.0 || ^7.0",
         "thecodingmachine/phpstan-strict-rules": "^1.0"
     },
@@ -51,6 +52,7 @@
         "lint": [
             "@phpstan",
             "@php-cs",
+            "@lint-rector",
             "@lint-composer",
             "@deptrac"
         ],
@@ -61,8 +63,18 @@
         "phpstan": [
             "@php vendor/bin/phpstan analyze"
         ],
+        "fix": [
+            "@rector",
+            "@php-cs-fix"
+        ],
         "php-cs": "@php vendor/bin/php-cs-fixer fix --verbose --diff --dry-run",
         "php-cs-fix": "@php vendor/bin/php-cs-fixer fix",
+        "rector": [
+            "@php vendor/bin/rector process"
+        ],
+        "lint-rector": [
+            "@php vendor/bin/rector process --dry-run"
+        ],
         "lint-composer": "@composer validate --strict",
         "deptrac": "@php vendor/qossmic/deptrac/deptrac.php"
     },
diff --git a/rector.php b/rector.php
new file mode 100644
index 0000000..4225388
--- /dev/null
+++ b/rector.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Sulu.
+ *
+ * (c) Sulu GmbH
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+use Rector\Config\RectorConfig;
+use Rector\Set\ValueObject\LevelSetList;
+use Rector\Set\ValueObject\SetList;
+
+return static function(RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([__DIR__ . '/src', __DIR__ . '/tests']);
+
+    $rectorConfig->phpstanConfigs([
+        __DIR__ . '/phpstan.neon',
+    ]);
+
+    // basic rules
+    $rectorConfig->importNames();
+    $rectorConfig->importShortClasses(false);
+
+    $rectorConfig->sets([
+        SetList::CODE_QUALITY,
+        LevelSetList::UP_TO_PHP_81,
+    ]);
+};
diff --git a/src/Application/Session/SessionManager.php b/src/Application/Session/SessionManager.php
index 3cfff12..7ee6a1a 100644
--- a/src/Application/Session/SessionManager.php
+++ b/src/Application/Session/SessionManager.php
@@ -19,8 +19,8 @@
 
 class SessionManager
 {
-    private string $workspace;
-    private string $workspaceLive;
+    private readonly string $workspace;
+    private readonly string $workspaceLive;
 
     /**
      * @param array{
@@ -39,7 +39,7 @@ class SessionManager
      */
     public function __construct(
         private array $configuration,
-        private ?Connection $connection = null,
+        private readonly ?Connection $connection = null,
     ) {
         $this->workspace = $configuration['workspace']['default'];
         $this->workspaceLive = $configuration['workspace']['live'];
@@ -57,7 +57,7 @@ public function getLiveSession(): SessionInterface
 
     private function getSession(string $workspace): SessionInterface
     {
-        $factory = $this->connection ? new RepositoryFactoryDoctrineDBAL() : new RepositoryFactoryJackrabbit();
+        $factory = $this->connection instanceof Connection ? new RepositoryFactoryDoctrineDBAL() : new RepositoryFactoryJackrabbit();
         $repository = $factory->getRepository(\array_filter([
             'jackalope.doctrine_dbal_connection' => $this->connection,
             'jackalope.jackrabbit_uri' => $this->configuration['connection']['url'] ?? null,
diff --git a/src/UserInterface/Command/MigratePhpcrCommand.php b/src/UserInterface/Command/MigratePhpcrCommand.php
index 3485690..174355a 100644
--- a/src/UserInterface/Command/MigratePhpcrCommand.php
+++ b/src/UserInterface/Command/MigratePhpcrCommand.php
@@ -20,7 +20,7 @@
 #[AsCommand(name: 'sulu:phpcr-migration:migrate', description: 'Migrate the PHPCR content repository to the SuluContentBundle.')]
 class MigratePhpcrCommand extends Command
 {
-    public function __construct(private SessionManager $sessionManager)
+    public function __construct(private readonly SessionManager $sessionManager)
     {
         parent::__construct();
     }