diff --git a/requirements.txt b/requirements.txt
index 7cfefeb..e2b168c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,6 +9,7 @@ Flask-SQLAlchemy==3.1.1
 Flask-User==1.0.2.2
 Flask-WTF==1.2.1
 gunicorn==21.2.0
+libsass==0.21.0
 PyMySQL==1.0.2
 SQLAlchemy==2.0.23
 sqlalchemy-datatables==2.0.1