diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,6 +18,7 @@ itsdangerous==0.24        # via flask
 jinja2==2.8               # via flask
 jsonschema==2.5.1
 markupsafe==0.23          # via jinja2
+onionpy==0.3.2
 pygeoip==0.3.2
 python-gnupg==0.3.7
 pytz==2015.7              # via babel