diff --git a/requirements.txt b/requirements.txt
index fc844c39e..7dd433851 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,5 +18,6 @@ ConfigParser==3.5.0
 MySQL-python==1.2.5
 mysql-connector-python
 python-engineio==3.9.0
+gunicorn==19.10.0
 flask-socketio==3.0.1
 # pytest-shutil
\ No newline at end of file