diff --git a/src/aks-preview/HISTORY.rst b/src/aks-preview/HISTORY.rst
index d9b7d2f8829..8d0c6144eac 100644
--- a/src/aks-preview/HISTORY.rst
+++ b/src/aks-preview/HISTORY.rst
@@ -11,6 +11,9 @@ To release a new version, please select a new version number (usually plus 1 to
 
 Pending
 +++++++
+
+19.0.0b21
++++++++
 * `az aks nodepool get-rollback-versions`: New command to get available rollback versions for an agent pool.
 * `az aks nodepool rollback`: New command to rollback an agent pool to the most recently used configuration (N-1).
 
diff --git a/src/aks-preview/setup.py b/src/aks-preview/setup.py
index 6963d1aeee8..ce28e702661 100644
--- a/src/aks-preview/setup.py
+++ b/src/aks-preview/setup.py
@@ -9,7 +9,7 @@
 
 from setuptools import find_packages, setup
 
-VERSION = "19.0.0b20"
+VERSION = "19.0.0b21"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",