diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
index 3cdbe1e4..6f8876dc 100644
--- a/doc/sphinx/conf.py
+++ b/doc/sphinx/conf.py
@@ -51,7 +51,7 @@
 # The short X.Y version.
 version = '1.3'
 # The full version, including alpha/beta/rc tags.
-release = '1.3.8'
+release = '1.3.9'
 
 
 # The language for content autogenerated by Sphinx. Refer to documentation