diff --git a/biggus/__init__.py b/biggus/__init__.py
index 79336f7..438c7c1 100644
--- a/biggus/__init__.py
+++ b/biggus/__init__.py
@@ -63,7 +63,7 @@
 import numpy.ma as ma
 
 
-__version__ = '0.8.0'
+__version__ = '0.9.0'
 
 
 _SCALAR_KEY_TYPES = (int, np.integer)
diff --git a/doc/conf.py b/doc/conf.py
index 789393f..9840122 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -50,9 +50,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.8.0'
+version = '0.9.0'
 # The full version, including alpha/beta/rc tags.
-release = '0.8.0'
+release = '0.9.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index fbab16c..26bff9a 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ def run(self):
 
 setup(
     name='Biggus',
-    version='0.8.0',
+    version='0.9.0',
     url='https://github.com/SciTools/biggus',
     author='Richard Hattersley',
     author_email='rhattersley@gmail.com',