diff --git a/eventlet/__init__.py b/eventlet/__init__.py
index 3f6fc80..d9db8c2 100644
--- a/eventlet/__init__.py
+++ b/eventlet/__init__.py
@@ -1,5 +1,5 @@
-version_info = (0, 15, 0)
-__version__ = ".".join(map(str, version_info))
+version_info = (0, 16, 0, 'dev')
+__version__ = '.'.join(map(str, version_info))
 
 try:
     from eventlet import greenthread