diff --git a/acme/setup.py b/acme/setup.py
index 36a724f97..6448b7fe9 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.0.0.dev20151008'
+version = '0.1.0.dev0'
 
 install_requires = [
     # load_pem_private/public_key (>=0.6)
diff --git a/letsencrypt-apache/setup.py b/letsencrypt-apache/setup.py
index ef9299b2c..626e700b2 100644
--- a/letsencrypt-apache/setup.py
+++ b/letsencrypt-apache/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.0.0.dev20151008'
+version = '0.1.0.dev0'
 
 install_requires = [
     'acme=={0}'.format(version),
diff --git a/letsencrypt-nginx/setup.py b/letsencrypt-nginx/setup.py
index dde7243a9..a37b8222b 100644
--- a/letsencrypt-nginx/setup.py
+++ b/letsencrypt-nginx/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.0.0.dev20151008'
+version = '0.1.0.dev0'
 
 install_requires = [
     'acme=={0}'.format(version),
diff --git a/letsencrypt/__init__.py b/letsencrypt/__init__.py
index d7ec9c5e3..1155a5b0c 100644
--- a/letsencrypt/__init__.py
+++ b/letsencrypt/__init__.py
@@ -1,4 +1,4 @@
 """Let's Encrypt client."""
 
 # version number like 1.2.3a0, must have at least 2 parts, like 1.2
-__version__ = '0.0.0.dev20151008'
+__version__ = '0.1.0.dev0'
diff --git a/letshelp-letsencrypt/setup.py b/letshelp-letsencrypt/setup.py
index ad517c74e..a83fc8843 100644
--- a/letshelp-letsencrypt/setup.py
+++ b/letshelp-letsencrypt/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.0.0.dev20151008'
+version = '0.1.0.dev0'
 
 install_requires = [
     'setuptools',  # pkg_resources