diff --git a/src/doc/conf.py b/src/doc/conf.py
index b9497435b113a57e7242aacdf6819f128ff8af66..a2bb79dcf0e8730e46c00603ea5380666f2f9b85 100644
--- a/src/doc/conf.py
+++ b/src/doc/conf.py
@@ -27,9 +27,9 @@ copyright = '2020, IndiScale GmbH'
 author = 'Daniel Hornung'
 
 # The short X.Y version
-version = '0.4.0'
+version = '0.5.1'
 # The full version, including alpha/beta/rc tags
-release = '0.4.0-rc'
+release = '0.5.1-rc'
 
 
 # -- General configuration ---------------------------------------------------