diff --git a/requirements-docs.in b/requirements-docs.in
index d82ea511..22161779 100644
--- a/requirements-docs.in
+++ b/requirements-docs.in
@@ -15,6 +15,7 @@ Flask-RESTful
 Flask-Script
 Flask-SQLAlchemy
 flask_replicated
+gunicorn
 inflection
 logmatic-python
 marshmallow-sqlalchemy
diff --git a/requirements-docs.txt b/requirements-docs.txt
index d815df7d..79e44b94 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -42,6 +42,8 @@ flask-script==2.0.6
     # manual debug
 flask-sqlalchemy==2.4.4
     # manual debug
+gunicorn==20.0.4
+    # manual debug
 inflection==0.5.1
     # manual debug
 jinja2==2.11.3