diff --git a/CHANGES b/CHANGES
index e98dea1..8e2236a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,12 @@
 Flask-Sijax Changelog
 =====================
 
+Version 0.4.0
+-------------
+
+Adds compatibility with Python 3.
+
+
 Version 0.3.3
 -------------
 
@@ -18,12 +24,14 @@ instead of the flaskext.sijax namespaced package.
 Minor backwards incompatible API changes that make Flask-Sijax
 more consistent with Flask extension patterns.
 
+
 Version 0.2.0
 -------------
 
 Adds compatibility with Sijax 0.2.0, which introduced some API changes.
 The Flask-Sijax API however remains unchanged.
 
+
 Version 0.1.x
 -------------
 
diff --git a/docs/conf.py b/docs/conf.py
index cb6916e..4c82f89 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -50,9 +50,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.3.3'
+version = '0.4.0'
 # The full version, including alpha/beta/rc tags.
-release = '0.3.3'
+release = '0.4.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index 057d5d0..073c568 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
 
 setup(
     name = "Flask-Sijax",
-    version = '0.3.3',
+    version = '0.4.0',
     description = "An extension for the Flask microframework that adds Sijax support.",
     long_description = __doc__,
     author = "Slavi Pantaleev",