diff --git a/CHANGES b/CHANGES
index 0bfe1f3c..9144bae1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,5 @@
 2013-05-28
-  bumped version to 1.0.0
+  bumped version to 1.0rc1
   merged in api_v1.1 branch
 
   The library is now only for Twitter API v1.1
diff --git a/setup.py b/setup.py
index 8f9bedc6..a3336f40 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 '''The setup and build script for the python-twitter library.'''
 
 __author__ = 'python-twitter@googlegroups.com'
-__version__ = '1.0.0'
+__version__ = '1.0rc1'
 
 
 # The base package metadata to be used by both distutils and setuptools
diff --git a/twitter.py b/twitter.py
index 4942acd4..45244c18 100755
--- a/twitter.py
+++ b/twitter.py
@@ -19,7 +19,7 @@
 '''A library that provides a Python interface to the Twitter API'''
 
 __author__ = 'python-twitter@googlegroups.com'
-__version__ = '1.0.0'
+__version__ = '1.0rc1'
 
 
 import calendar