diff --git a/README.md b/README.md
index dc78778b..481d1d36 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# tcframe 0.3.0
+# tcframe 0.4.0
 
 [![Build Status](https://travis-ci.org/ia-toki/tcframe.svg?branch=master)](https://travis-ci.org/ia-toki/tcframe)
 [![Coverage Status](https://coveralls.io/repos/ia-toki/tcframe/badge.svg?branch=master)](https://coveralls.io/r/ia-toki/tcframe?branch=master)
diff --git a/docs/conf.py b/docs/conf.py
index a5e23439..d6403a46 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,9 +53,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.2'
+version = '0.4'
 # The full version, including alpha/beta/rc tags.
-release = '0.2.0'
+release = '0.4.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.