diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index 6bb6cd524..db11db344 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -83,3 +83,4 @@ django-redis-sessions==0.6.1
 unicodecsv==0.14.1
 python-daemon==2.2.3
 httpsig==1.3.0
+treelib==1.5.3