diff --git a/requirements.txt b/requirements.txt
index f760f832f..96aece762 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,6 +18,7 @@ python-engineio==3.13.2
 python-socketio==4.2.0
 Flask-SocketIO==3.0.2
 zmq==0.0.0
+pillow
 Jinja2
 mysqlclient==2.0.3
 requests==2.20.0