diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 004a77e..1fc2e6e 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.15.0
+current_version = 0.15.1-dev
 commit = True
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 8617c18..67126c4 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -58,9 +58,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.15.0'
+version = '0.15.1-dev'
 # The full version, including alpha/beta/rc tags.
-release = '0.15.0'
+release = '0.15.1-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pyecore/__init__.py b/pyecore/__init__.py
index cba6e44..0c5b197 100644
--- a/pyecore/__init__.py
+++ b/pyecore/__init__.py
@@ -2,4 +2,4 @@
 
 """
 
-__version__ = "0.15.0"
+__version__ = "0.15.1-dev"
diff --git a/setup.py b/setup.py
index f22ef1a..ea47aab 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 
 setup(
     name='pyecore',
-    version='0.15.0',
+    version='0.15.1-dev',
     description=('A Python(ic) Implementation of the Eclipse Modeling '
                  'Framework (EMF/Ecore)'),
     long_description=open('README.rst').read(),