diff --git a/streaming_data_types/_version.py b/streaming_data_types/_version.py
index 29368b1..fc505d7 100644
--- a/streaming_data_types/_version.py
+++ b/streaming_data_types/_version.py
@@ -1,4 +1,4 @@
 # Version is not directly defined in __init__ because that causes all
 # run time dependencies to become build-time dependencies when it is
 # imported in setup.py
-version = "0.21.0"
+version = "0.21.1"