diff --git a/acme/setup.py b/acme/setup.py
index d81c13423..b5bec3476 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.3.0'
+version = '0.4.0.dev0'
 
 # Please update tox.ini when modifying dependency version requirements
 install_requires = [
diff --git a/letsencrypt-apache/setup.py b/letsencrypt-apache/setup.py
index af83c9b60..a6553d890 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 = '0.3.0'
+version = '0.4.0.dev0'
 
 # Please update tox.ini when modifying dependency version requirements
 install_requires = [
diff --git a/letsencrypt-compatibility-test/setup.py b/letsencrypt-compatibility-test/setup.py
index 00181130a..b7f448e83 100644
--- a/letsencrypt-compatibility-test/setup.py
+++ b/letsencrypt-compatibility-test/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.3.0'
+version = '0.4.0.dev0'
 
 install_requires = [
     'letsencrypt=={0}'.format(version),
diff --git a/letsencrypt-nginx/setup.py b/letsencrypt-nginx/setup.py
index 6741d1d52..c1ff85185 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 = '0.3.0'
+version = '0.4.0.dev0'
 
 # Please update tox.ini when modifying dependency version requirements
 install_requires = [
diff --git a/letsencrypt/__init__.py b/letsencrypt/__init__.py
index 32b637bb6..1dd7d7eba 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__ = '0.3.0'
+__version__ = '0.4.0.dev0'
diff --git a/letshelp-letsencrypt/setup.py b/letshelp-letsencrypt/setup.py
index 20bfb7158..000f86c31 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 = '0.3.0'
+version = '0.4.0.dev0'
 
 install_requires = [
     'setuptools',  # pkg_resources