diff --git a/app/Http/Requests/Api/V2/SendArchadiaGameMailRequest.php b/app/Http/Requests/Api/V2/SendArchadiaGameMailRequest.php
index c382a00..93a6387 100644
--- a/app/Http/Requests/Api/V2/SendArchadiaGameMailRequest.php
+++ b/app/Http/Requests/Api/V2/SendArchadiaGameMailRequest.php
@@ -40,7 +40,7 @@ class SendArchadiaGameMailRequest extends BaseApiRequest
     public function rules(): array
     {
         return [
-            'code_on_pack' => 'sometimes|string',
+            'code_on_pack' => 'sometimes|string|max:50',
             'code_unique' => 'required|string',
             'label_type_support' => 'required|string',
             'operation' => 'required|int',