diff --git a/azure/functions/__init__.py b/azure/functions/__init__.py
index 86565e3..e7add80 100644
--- a/azure/functions/__init__.py
+++ b/azure/functions/__init__.py
@@ -98,4 +98,4 @@ __all__ = (
     'BlobSource'
 )
 
-__version__ = '1.21.0'
+__version__ = '1.21.1'