diff --git a/src/aks-preview/HISTORY.rst b/src/aks-preview/HISTORY.rst
index 90ad1c6d46e..b58406fdad7 100644
--- a/src/aks-preview/HISTORY.rst
+++ b/src/aks-preview/HISTORY.rst
@@ -12,13 +12,18 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
-0.5.90
+0.5.91
 ++++++
 
 * Fix compatibility issue when enabling Microsoft Defender via aks-preview.
     * az aks create
     * az aks update
 
+0.5.90 (NOT RELEASED)
++++++++++++++++++++++
+
+* Skip this version due to conflict.
+
 0.5.89
 ++++++
 
diff --git a/src/aks-preview/setup.py b/src/aks-preview/setup.py
index 5d5444cb3fb..7627d774874 100644
--- a/src/aks-preview/setup.py
+++ b/src/aks-preview/setup.py
@@ -9,7 +9,7 @@
 
 from setuptools import setup, find_packages
 
-VERSION = "0.5.90"
+VERSION = "0.5.91"
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",