diff --git a/docs/source/conf.py b/docs/source/conf.py
index 7ea627c7..cc735083 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -31,7 +31,7 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.3.1'
+version = '1.4.0'
 # The full version, including alpha/beta/rc tags.
 release = version