diff --git a/Build/phpstan/phpstan.neon b/Build/phpstan/phpstan.neon
index 21c1ec9..f58c47f 100644
--- a/Build/phpstan/phpstan.neon
+++ b/Build/phpstan/phpstan.neon
@@ -3,7 +3,7 @@ includes:
 
 parameters:
   phpVersion: 80200
-  level: 4
+  level: 5
 
   bootstrapFiles:
     - phpstan-typo3-constants.php
diff --git a/Classes/Controller/HtmlParserController.php b/Classes/Controller/HtmlParserController.php
index 8960b92..87d6376 100644
--- a/Classes/Controller/HtmlParserController.php
+++ b/Classes/Controller/HtmlParserController.php
@@ -90,7 +90,7 @@ public function indexAction(): ResponseInterface
                 $testHTML,
                 $tagCfg,
                 false,
-                false,
+                0,
                 ['xhtml' => 1],
             ),
         );