diff --git a/azure/functions/__init__.py b/azure/functions/__init__.py
index 57511eb9..25eaf786 100644
--- a/azure/functions/__init__.py
+++ b/azure/functions/__init__.py
@@ -98,4 +98,4 @@
     'BlobSource'
 )
 
-__version__ = '1.20.0'
+__version__ = '1.21.0b1'