diff --git a/pymongo/__init__.py b/pymongo/__init__.py
index ea2cb1d42..0872dc08e 100644
--- a/pymongo/__init__.py
+++ b/pymongo/__init__.py
@@ -70,7 +70,7 @@ SLOW_ONLY = 1
 ALL = 2
 """Profile all operations."""
 
-version_tuple = (3, 4, 0)
+version_tuple = (3, 5, 0, '.dev0')
 
 def get_version_string():
     if isinstance(version_tuple[-1], str):
diff --git a/setup.py b/setup.py
index c4c417ecd..fee496f68 100755
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ try:
 except ImportError:
     _HAVE_SPHINX = False
 
-version = "3.4.0"
+version = "3.5.0.dev0"
 
 f = open("README.rst")
 try: