diff --git a/python-2.7.13-4.build.sh b/python-2.7.13-4.build.sh
index 346a617..8950c01 100755
--- a/python-2.7.13-4.build.sh
+++ b/python-2.7.13-4.build.sh
@@ -149,5 +149,6 @@ pip install deeptools   # Alene vom Boemmel -> helpdesk 19.04.2017
 
 pip install sphinx
 pip install recommonmark # Sabrina Krakau -> Helpdesk 21.06.2017
+pip install fastcluster # Peter Arndt → Helpdesk: PANNZER - dependencies, 21.07.2017
 
 exit