diff --git a/phpstan.neon b/phpstan.neon
index c6f0727..166988e 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,5 @@
 parameters:
-    level: 8
+    level: max
     paths:
         - 'src'
         - 'tests'
diff --git a/src/zugferd2/Reader.php b/src/zugferd2/Reader.php
index f4e4208..066d8b4 100644
--- a/src/zugferd2/Reader.php
+++ b/src/zugferd2/Reader.php
@@ -16,6 +16,7 @@ public function __construct(private readonly SerializerInterface $serializer)
 
     public function transform(string $xml): CrossIndustryInvoice
     {
+        // @phpstan-ignore-next-line
         return $this->serializer->deserialize($xml, CrossIndustryInvoice::class, 'xml');
     }