diff --git a/telethon/version.py b/telethon/version.py
index 1b84e541..366130a9 100644
--- a/telethon/version.py
+++ b/telethon/version.py
@@ -1,3 +1,3 @@
 # Versions should comply with PEP440.
 # This line is parsed in setup.py:
-__version__ = '1.21'
+__version__ = '1.21.1'