diff --git a/doc/whats-new.rst b/doc/whats-new.rst
index 38db78fd472..44fd6498f5c 100644
--- a/doc/whats-new.rst
+++ b/doc/whats-new.rst
@@ -9,8 +9,8 @@ What's New
     import xray
     np.random.seed(123456)
 
-v0.4 (unreleased)
------------------
+v0.4 (2 March, 2015)
+--------------------
 
 This is one of the biggest releases yet for xray: it includes some major
 changes that may break existing code, along with the usual collection of minor
diff --git a/setup.py b/setup.py
index 5b5b0d610f0..4a0b2b226e8 100644
--- a/setup.py
+++ b/setup.py
@@ -7,9 +7,9 @@
 from setuptools import setup, find_packages
 
 MAJOR = 0
-MINOR = 3
-MICRO = 2
-ISRELEASED = False
+MINOR = 4
+MICRO = 0
+ISRELEASED = True
 VERSION = '%d.%d.%d' % (MAJOR, MINOR, MICRO)
 QUALIFIER = ''