diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a5b1b1..396c54e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Forthcoming
 
+## v0.5.1
+
+- Add `m7b9b5` quality.
+
 ## v0.5.0
 
 - Add Chord.components_with_pitch method.
diff --git a/setup.py b/setup.py
index ecf02bd..91b745e 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,5 @@
 from setuptools import setup, find_packages
-version = '0.5.0'
+version = '0.5.1'
 
 setup(
     name='pychord',