diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@
 #    pip-compile requirements.in
 #
 blinker==1.4              # via flask-mail
+click==5.1
 dominate==2.1.12          # via flask-bootstrap
 Flask-Bootstrap==3.3.5.6
 Flask-HTTPAuth==2.6.0