diff --git a/docs/changes.rst b/docs/changes.rst
index 3622b4ce9..a84f02509 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -1,6 +1,9 @@
 Release History
 ===============
 
+15.1.0 (unreleased)
+-------------------
+
 15.0.2 (2016-05-28)
 -------------------
 
diff --git a/virtualenv.py b/virtualenv.py
index fb9337f34..61ccfb2ad 100755
--- a/virtualenv.py
+++ b/virtualenv.py
@@ -36,7 +36,7 @@
 except ImportError:
     import configparser as ConfigParser
 
-__version__ = "15.0.2"
+__version__ = "15.1.0.dev0"
 virtualenv_version = __version__  # legacy
 
 if sys.version_info < (2, 6):