diff --git a/composer.json b/composer.json
index 4a996e5..bfa7169 100644
--- a/composer.json
+++ b/composer.json
@@ -105,6 +105,7 @@
         "analyse": "psalm",
         "check-style": "ecs check",
         "fix-style": "ecs check --fix",
-        "phpunit": "phpunit"
+        "phpunit": "phpunit",
+        "rector": "rector"
     }
 }
diff --git a/src/WebhookHandler/OrderPackedWebhookHandler.php b/src/WebhookHandler/OrderPackedWebhookHandler.php
index 35b44ae..ffd3d9f 100644
--- a/src/WebhookHandler/OrderPackedWebhookHandler.php
+++ b/src/WebhookHandler/OrderPackedWebhookHandler.php
@@ -38,19 +38,15 @@ public function handle(object $data): void
             throw new \InvalidArgumentException(sprintf('Order with id "%s" not found', $data->orderId));
         }
 
-        $syliusOrderLines = array_values(array_map(static function (OrderItemInterface $orderItem): array {
-            return [
-                'id' => (string) $orderItem->getId(),
-                'quantity' => $orderItem->getQuantity(),
-            ];
-        }, $order->getItems()->toArray()));
-
-        $peakOrderLines = array_map(static function (WebhookDataPickOrderLine $orderLine): array {
-            return [
-                'id' => $orderLine->orderLineId,
-                'quantity' => $orderLine->quantity,
-            ];
-        }, $data->orderLines);
+        $syliusOrderLines = array_values(array_map(static fn (OrderItemInterface $orderItem): array => [
+            'id' => (string) $orderItem->getId(),
+            'quantity' => $orderItem->getQuantity(),
+        ], $order->getItems()->toArray()));
+
+        $peakOrderLines = array_map(static fn (WebhookDataPickOrderLine $orderLine): array => [
+            'id' => $orderLine->orderLineId,
+            'quantity' => $orderLine->quantity,
+        ], $data->orderLines);
 
         try {
             self::assertSame($syliusOrderLines, $peakOrderLines);