diff --git a/conf.py b/conf.py
index fb8bde8..94bfe6b 100644
--- a/conf.py
+++ b/conf.py
@@ -44,7 +44,7 @@
 # The short X.Y version.
 version = '0.9'
 # The full version, including alpha/beta/rc tags.
-release = '0.9.9rc3'
+release = '0.9.9rc4'
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used: