diff --git a/api/requirements.txt b/api/requirements.txt
index e4e0060..4554304 100644
--- a/api/requirements.txt
+++ b/api/requirements.txt
@@ -3,6 +3,7 @@ astroid==2.4.2
 click==7.1.2
 Flask==1.1.2
 Flask-RESTful==0.3.8
+gunicorn==20.0.4
 isort==4.3.21
 itsdangerous==1.1.0
 Jinja2==2.11.2