diff --git a/website/requirements.txt b/website/requirements.txt
index 6a8c00455..2609f65ab 100644
--- a/website/requirements.txt
+++ b/website/requirements.txt
@@ -1,6 +1,7 @@
 cffi==1.11.4
 click==6.7
 emoji==0.4.5
+flake8==3.5.0
 Flask==0.12.2
 Flask-OAuth==0.12
 gunicorn==19.7.1