diff --git a/README.rst b/README.rst
index eb37d91a4..49301f2bd 100644
--- a/README.rst
+++ b/README.rst
@@ -6,7 +6,7 @@
 .. image:: https://readthedocs.org/projects/ray/badge/?version=latest
     :target: http://ray.readthedocs.io/en/latest/?badge=latest
 
-.. image:: https://img.shields.io/badge/pypi-0.6.3-blue.svg
+.. image:: https://img.shields.io/badge/pypi-0.6.4-blue.svg
     :target: https://pypi.org/project/ray/
 
 |
diff --git a/python/ray/__init__.py b/python/ray/__init__.py
index 5336dd3a0..fddcde111 100644
--- a/python/ray/__init__.py
+++ b/python/ray/__init__.py
@@ -95,7 +95,7 @@ from ray.actor import method  # noqa: E402
 from ray.runtime_context import _get_runtime_context  # noqa: E402
 
 # Ray version string.
-__version__ = "0.6.4"
+__version__ = "0.7.0.dev1"
 
 __all__ = [
     "LOCAL_MODE",