diff --git a/aiogram/webhook/aiohttp_server.py b/aiogram/webhook/aiohttp_server.py
index cbe64350..ed7d86a8 100644
--- a/aiogram/webhook/aiohttp_server.py
+++ b/aiogram/webhook/aiohttp_server.py
@@ -224,7 +224,7 @@ class SimpleRequestHandler(BaseRequestHandler):
         self.bot = bot
         self.secret_token = secret_token
 
-    def verify_secret(self, telegram_secret_token: Optional[str]) -> bool:
+    def verify_secret(self, telegram_secret_token: str) -> bool:
         if self.secret_token:
             return secrets.compare_digest(telegram_secret_token, self.secret_token)
         return True