diff --git a/requirements.txt b/requirements.txt
index 42558dbbb..420cf6180 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,6 +33,7 @@ pyzmail>=1.0.3
 selenium>=2.42
 six>=1.8.0
 tqdm>=3.7.0
+Trac>=1.0.10
 Unidecode>=0.4.18
 #wsgiref>=0.1.2
 xml2rfc>=2.5.