diff --git a/aiogram/api/client/session/base.py b/aiogram/api/client/session/base.py
index 063ce8d7..379e69ac 100644
--- a/aiogram/api/client/session/base.py
+++ b/aiogram/api/client/session/base.py
@@ -24,9 +24,7 @@ class BaseSession(abc.ABC):
     api: Default[TelegramAPIServer] = Default(PRODUCTION)
     json_loads: Default[_JsonLoads] = Default(json.loads)
     json_dumps: Default[_JsonDumps] = Default(json.dumps)
-    timeout: Default[float] = Default(
-        fget=lambda self: float(self.__class__.default_timeout)
-    )
+    timeout: Default[float] = Default(fget=lambda self: float(self.__class__.default_timeout))
 
     @classmethod
     def raise_for_status(cls, response: Response[T]) -> None:
diff --git a/aiogram/utils/helper.py b/aiogram/utils/helper.py
index 8aadd225..57f4e76e 100644
--- a/aiogram/utils/helper.py
+++ b/aiogram/utils/helper.py
@@ -245,7 +245,7 @@ class Default(Generic[T]):
     Example:
         >>> class MyClass:
         ...     att = Default("dflt")
-        ... 
+        ...
         >>> my_instance = MyClass()
         >>> my_instance.att = "not dflt"
         >>> my_instance.att