diff --git a/CHANGES.rst b/CHANGES.rst
index 4086779..4b5c7cc 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,12 @@ Changelog
 Here you can see the full list of changes between each SQLAlchemy-Utils release.
 
 
+0.16.21 (2013-09-29)
+^^^^^^^^^^^^^^^^^^^^
+
+- Fixed an issue with sort_query where sort by relationship property would cause an exception.
+
+
 0.16.20 (2013-09-26)
 ^^^^^^^^^^^^^^^^^^^^
 
diff --git a/setup.py b/setup.py
index 5a36ae8..da92265 100644
--- a/setup.py
+++ b/setup.py
@@ -56,7 +56,7 @@ for name, requirements in extras_require.items():
 
 setup(
     name='SQLAlchemy-Utils',
-    version='0.16.20',
+    version='0.16.21',
     url='https://github.com/kvesteri/sqlalchemy-utils',
     license='BSD',
     author='Konsta Vesterinen, Ryan Leckey, Janne Vanhala, Vesa Uimonen',
diff --git a/sqlalchemy_utils/__init__.py b/sqlalchemy_utils/__init__.py
index bb4b3ec..8b96861 100644
--- a/sqlalchemy_utils/__init__.py
+++ b/sqlalchemy_utils/__init__.py
@@ -38,7 +38,7 @@ from .types import (
 )
 
 
-__version__ = '0.16.20'
+__version__ = '0.16.21'
 
 
 __all__ = (