diff --git a/apiserver/requirements.txt b/apiserver/requirements.txt
index d6fca8b..a15e72f 100644
--- a/apiserver/requirements.txt
+++ b/apiserver/requirements.txt
@@ -13,6 +13,7 @@ django-rest-auth==0.9.5
 djangorestframework==3.11.0
 docutils==0.16
 fuzzywuzzy==0.17.0
+gunicorn==20.0.4
 idna==2.8
 imagesize==1.2.0
 Jinja2==2.10.3