diff --git a/CHANGES.rst b/CHANGES.rst
index 8be83315..58d7fcbe 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+0.9.1 (2022-07-11)
+------------------
+* Implement `raise_unauthorized` for taxii2, this was missing and lead to 500 errors.
+
 0.9.0 (2022-06-13)
 ------------------
 * Allow custom properties. This can be disabled by config option ``allow_custom_properties``
diff --git a/opentaxii/_version.py b/opentaxii/_version.py
index f64817ea..ce8ed276 100644
--- a/opentaxii/_version.py
+++ b/opentaxii/_version.py
@@ -3,4 +3,4 @@
 This module defines the package version for use in __init__.py and setup.py.
 """
 
-__version__ = '0.9.0'
+__version__ = '0.9.1'