diff --git a/backend/bot/app/web/webapp/serializers.py b/backend/bot/app/web/webapp/serializers.py
index b292679..cffbd28 100644
--- a/backend/bot/app/web/webapp/serializers.py
+++ b/backend/bot/app/web/webapp/serializers.py
@@ -105,9 +105,7 @@ async def _build_user_payload(request: web.Request, user_id: int) -> Dict[str, A
     admin_ids = {int(x) for x in (settings.ADMIN_IDS or [])}
     is_admin = bool(db_user.telegram_id and int(db_user.telegram_id) in admin_ids)
     telegram_linked = _user_has_linked_telegram(db_user)
-    referral_welcome_days = max(
-        0, int(getattr(settings, "REFERRAL_WELCOME_BONUS_DAYS", 0) or 0)
-    )
+    referral_welcome_days = max(0, int(getattr(settings, "REFERRAL_WELCOME_BONUS_DAYS", 0) or 0))
     referral_welcome_telegram_required_reason = (
         _referral_welcome_telegram_required_reason(settings, db_user)
         if db_user.referred_by_id and not active and referral_welcome_days > 0
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 8fd48a7..ac2152a 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -1,6 +1,6 @@
 aiogram==3.28.2
 python-dotenv==1.2.2
-aiohttp==3.13.5
+aiohttp>=3.13.5,<3.14
 pydantic==2.13.4
 yookassa==3.10.1
 httpx>=0.27.0