diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,6 +43,7 @@ Paste==2.0.3
 PasteDeploy==1.5.2
 PasteScript==1.7.5
 pathlib2==2.3.0
+peppercorn==0.5
 psutil==4.3.1
 psycopg2==2.7.1
 py-bcrypt==0.4