diff --git a/docs/source/conf.py b/docs/source/conf.py
index 53e913c2bcc87f4d24672296d4594b2ae3fc7dea..ce7e098c4f45c5e24a683abbe35e6f17bc69ad73 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -72,7 +72,7 @@ author = 'Robert Speck, Thibaut Lunet, Thomas Baumann, Lisa Wimmer, Ikrom Akramo
 # The short X.Y version.
 version = '5.6'
 # The full version, including alpha/beta/rc tags.
-release = '5.6
+release = '5.6'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.