diff --git a/client/src/telethon/_impl/client/client/auth.py b/client/src/telethon/_impl/client/client/auth.py
index 757771e7..d7b4f014 100644
--- a/client/src/telethon/_impl/client/client/auth.py
+++ b/client/src/telethon/_impl/client/client/auth.py
@@ -57,15 +57,11 @@ async def complete_login(client: Client, auth: abcs.auth.Authorization) -> User:
 async def handle_migrate(client: Client, dc_id: Optional[int]) -> None:
     assert client._sender
     assert dc_id is not None
-    sender, client._session.dcs = await connect_sender(
+    await client._sender.disconnect()
+    client._sender, client._session.dcs = await connect_sender(
         client._config, client._session.dcs, DataCenter(id=dc_id)
     )
 
-    async with client._sender._step_lock:
-        old_sender = client._sender
-        client._sender = sender
-        await old_sender.disconnect()
-
 
 async def bot_sign_in(self: Client, token: str) -> User:
     request = functions.auth.import_bot_authorization(