diff --git a/CHANGELOG.md b/CHANGELOG.md
index 760e309..9cb671a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+* Version 2.1 - 05/09/2015
+    * Improve array and map unpacking performance under Python 2.
+    * Add module `__version__` attribute.
+
 * Version 2.0 - 09/29/2014
     * Add streaming serialization and deserialization with `pack`/`dump` and `unpack`/`load`, respectively, for file-like objects.
 
diff --git a/README.md b/README.md
index fbf919f..a95d76a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# u-msgpack-python v2.0
+# u-msgpack-python v2.1
 
 u-msgpack-python is a lightweight [MessagePack](http://msgpack.org/) serializer and deserializer module written in pure Python, compatible with both Python 2 and 3, as well CPython and PyPy implementations of Python. u-msgpack-python is fully compliant with the latest [MessagePack specification](https://github.com/msgpack/msgpack/blob/master/spec.md). In particular, it supports the new binary, UTF-8 string, and application-defined ext types.
 
diff --git a/msgpack.org.md b/msgpack.org.md
index 0c2a822..d8a53b2 100644
--- a/msgpack.org.md
+++ b/msgpack.org.md
@@ -1,4 +1,4 @@
-# u-msgpack-python v2.0
+# u-msgpack-python v2.1
 
 u-msgpack-python is a lightweight [MessagePack](http://msgpack.org/) serializer and deserializer module written in pure Python, compatible with both Python 2 and 3, as well CPython and PyPy implementations of Python. u-msgpack-python is fully compliant with the latest [MessagePack specification](https://github.com/msgpack/msgpack/blob/master/spec.md).
 
diff --git a/setup.py b/setup.py
index e6d1f0f..fa314b0 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='u-msgpack-python',
-    version='2.0',
+    version='2.1',
     description='A portable, lightweight MessagePack serializer and deserializer written in pure Python.',
     author='vsergeev',
     author_email='vsergeev at gmail',
diff --git a/umsgpack.py b/umsgpack.py
index 78d18a8..4c2120c 100644
--- a/umsgpack.py
+++ b/umsgpack.py
@@ -1,4 +1,4 @@
-# u-msgpack-python v2.0 - vsergeev at gmail
+# u-msgpack-python v2.1 - vsergeev at gmail
 # https://github.com/vsergeev/u-msgpack-python
 #
 # u-msgpack-python is a lightweight MessagePack serializer and deserializer
@@ -31,7 +31,7 @@
 # THE SOFTWARE.
 #
 """
-u-msgpack-python v2.0 - vsergeev at gmail
+u-msgpack-python v2.1 - vsergeev at gmail
 https://github.com/vsergeev/u-msgpack-python
 
 u-msgpack-python is a lightweight MessagePack serializer and deserializer
@@ -44,10 +44,10 @@
 License: MIT
 """
 
-__version__ = "2.0"
+__version__ = "2.1"
 "Module version string"
 
-version = (2,0)
+version = (2,1)
 "Module version tuple"
 
 import struct