diff --git a/openmdao/__init__.py b/openmdao/__init__.py
index b8464e15f2..8034f42306 100644
--- a/openmdao/__init__.py
+++ b/openmdao/__init__.py
@@ -1,3 +1,3 @@
-__version__ = '3.3.0'
+__version__ = '3.3.1-dev'
 
 INF_BOUND = 1.0E30