bump version to 1.10.0
diff --git a/CHANGES b/CHANGES
index cbf4c47..6e9df6d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3,8 +3,8 @@
 
 This file lists the changes in each six version.
 
-Development version
--------------------
+1.10.0
+------
 
 - Issue #122: Improve the performance of `six.int2byte` on Python 3.
 
diff --git a/six.py b/six.py
index a104cb8..190c023 100644
--- a/six.py
+++ b/six.py
@@ -29,7 +29,7 @@
 import types
 
 __author__ = "Benjamin Peterson <benjamin@python.org>"
-__version__ = "1.9.0"
+__version__ = "1.10.0"
 
 
 # Useful for very coarse version differentiation.