diff --git a/composer.json b/composer.json
index 045afa8..bf6b29d 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
   "require-dev": {
     "bamarni/composer-bin-plugin": "^1.8.2",
     "phpstan/extension-installer": "^1.3.1",
-    "phpstan/phpstan": "^1.10.55",
+    "phpstan/phpstan": "^1.10.56",
     "phpstan/phpstan-deprecation-rules": "^1.1.4",
     "phpstan/phpstan-strict-rules": "^1.5.2",
     "rector/rector": "^0.18.13",
diff --git a/src/Document/DocumentNormalizerTrait.php b/src/Document/DocumentNormalizerTrait.php
index f904aa1..b0a5d8b 100644
--- a/src/Document/DocumentNormalizerTrait.php
+++ b/src/Document/DocumentNormalizerTrait.php
@@ -86,7 +86,7 @@ protected function editableRelation(
                     fn (Concrete $obj): int => $obj->getId(),
                     $contents
                         ->getChildren([AbstractObject::OBJECT_TYPE_OBJECT])
-                        ->getData()??[]
+                        ->getData() ?? []
                 )
             );