diff --git a/pymongo/__init__.py b/pymongo/__init__.py
index 0cabe8015..b2aab0173 100644
--- a/pymongo/__init__.py
+++ b/pymongo/__init__.py
@@ -70,7 +70,7 @@ SLOW_ONLY = 1
 ALL = 2
 """Profile all operations."""
 
-version_tuple = (3, 3, 0)
+version_tuple = (3, 4, 0, ".dev0")
 
 def get_version_string():
     if isinstance(version_tuple[-1], str):
diff --git a/setup.py b/setup.py
index d7e780d62..2198e2b52 100755
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@ from distutils.errors import CCompilerError, DistutilsOptionError
 from distutils.errors import DistutilsPlatformError, DistutilsExecError
 from distutils.core import Extension
 
-version = "3.3.0"
+version = "3.4.0.dev0"
 
 f = open("README.rst")
 try: