diff --git a/telethon/network/mtproto_sender.py b/telethon/network/mtproto_sender.py
index 2e1f4627..61e60484 100644
--- a/telethon/network/mtproto_sender.py
+++ b/telethon/network/mtproto_sender.py
@@ -312,6 +312,7 @@ class MtProtoSender:
         self.session.salt = struct.unpack(
             '<Q', struct.pack('<q', bad_salt.new_server_salt)
         )[0]
+        self.session.save()
 
         request = self._pop_request(bad_salt.bad_msg_id)
         if request: