diff --git a/Changelog.rst b/Changelog.rst
index 1d15ec7b..6181fdb1 100644
--- a/Changelog.rst
+++ b/Changelog.rst
@@ -3,6 +3,9 @@
 Changelog
 =========
 
+1.6.0 (dev)
+-----------
+
 1.5.0 (2015-05-18)
 ------------------
 
diff --git a/docs/conf.py b/docs/conf.py
index bce9eb47..a4bf30b0 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -50,9 +50,9 @@ copyright = u'2013, Honza Král'
 # built documents.
 #
 # The short X.Y version.
-version = '1.5.0'
+version = '1.6.0'
 # The full version, including alpha/beta/rc tags.
-release = '1.5.0'
+release = '1.6.0-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/elasticsearch/__init__.py b/elasticsearch/__init__.py
index c6ce60a8..688e1712 100644
--- a/elasticsearch/__init__.py
+++ b/elasticsearch/__init__.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-VERSION = (1, 5, 0)
+VERSION = (1, 5, 0, 'dev')
 __version__ = VERSION
 __versionstr__ = '.'.join(map(str, VERSION))
 
diff --git a/setup.py b/setup.py
index c487f263..b2ca2dc9 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup, find_packages
 import sys
 import os
 
-VERSION = (1, 5, 0)
+VERSION = (1, 6, 0, 'dev')
 __version__ = VERSION
 __versionstr__ = '.'.join(map(str, VERSION))