update versions for 0.4.dev1 and add boilerplate to changelog
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a6d1619..34c544d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+0.4 - `master`_
+~~~~~~~~~~~~~~~
+
+.. note:: This version is not yet released and is under active development.
+
 0.3 - 2014-03-27
 ~~~~~~~~~~~~~~~~
 
diff --git a/cryptography/__about__.py b/cryptography/__about__.py
index 492fe10..ce0f32f 100644
--- a/cryptography/__about__.py
+++ b/cryptography/__about__.py
@@ -22,7 +22,7 @@
                " and primitives to Python developers.")
 __uri__ = "https://github.com/pyca/cryptography"
 
-__version__ = "0.3"
+__version__ = "0.4.dev1"
 
 __author__ = "The cryptography developers"
 __email__ = "cryptography-dev@python.org"
diff --git a/vectors/cryptography_vectors/__about__.py b/vectors/cryptography_vectors/__about__.py
index 2a22c0a..ad61c1b 100644
--- a/vectors/cryptography_vectors/__about__.py
+++ b/vectors/cryptography_vectors/__about__.py
@@ -22,7 +22,7 @@
 
 __uri__ = "https://github.com/pyca/cryptography"
 
-__version__ = "0.3"
+__version__ = "0.4.dev1"
 
 __author__ = "The cryptography developers"
 __email__ = "cryptography-dev@python.org"