diff --git a/acme/setup.py b/acme/setup.py
index 4845d7f1e..41c04fd33 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-version = '0.5.0'
+version = '0.6.0.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 93b0f3296..c2ec7dabd 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 = '0.5.0'
+version = '0.6.0.dev0'
 
 # Please update tox.ini when modifying dependency version requirements
 install_requires = [
diff --git a/letsencrypt-auto-source/letsencrypt-auto b/letsencrypt-auto-source/letsencrypt-auto
index 942fd8ea2..111f2b272 100755
--- a/letsencrypt-auto-source/letsencrypt-auto
+++ b/letsencrypt-auto-source/letsencrypt-auto
@@ -19,7 +19,7 @@ XDG_DATA_HOME=${XDG_DATA_HOME:-~/.local/share}
 VENV_NAME="letsencrypt"
 VENV_PATH=${VENV_PATH:-"$XDG_DATA_HOME/$VENV_NAME"}
 VENV_BIN="$VENV_PATH/bin"
-LE_AUTO_VERSION="0.5.0"
+LE_AUTO_VERSION="0.6.0.dev0"
 
 # This script takes the same arguments as the main letsencrypt program, but it
 # additionally responds to --verbose (more output) and --debug (allow support
diff --git a/letsencrypt-compatibility-test/setup.py b/letsencrypt-compatibility-test/setup.py
index 56dd926cd..25104aeef 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 = '0.5.0'
+version = '0.6.0.dev0'
 
 install_requires = [
     'letsencrypt=={0}'.format(version),
diff --git a/letsencrypt-nginx/setup.py b/letsencrypt-nginx/setup.py
index 186de748b..54b69adc3 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 = '0.5.0'
+version = '0.6.0.dev0'
 
 # Please update tox.ini when modifying dependency version requirements
 install_requires = [
diff --git a/letsencrypt/__init__.py b/letsencrypt/__init__.py
index 8851aeda7..3f65e6d83 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__ = '0.5.0'
+__version__ = '0.6.0.dev0'
diff --git a/letshelp-letsencrypt/setup.py b/letshelp-letsencrypt/setup.py
index a9712acb7..d505858e4 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 = '0.5.0'
+version = '0.6.0.dev0'
 
 install_requires = [
     'setuptools',  # pkg_resources