diff --git a/docs/conf.py b/docs/conf.py
index 97e2f96..140fe51 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -64,9 +64,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.3.2'
+version = '0.4.0'
 # The full version, including alpha/beta/rc tags.
-release = '0.3.2'
+release = '0.4.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.