diff --git a/docker/requirements.txt b/docker/requirements.txt
index 7118a0670a..cd27bdb5ce 100644
--- a/docker/requirements.txt
+++ b/docker/requirements.txt
@@ -10,3 +10,6 @@ psycopg2>=2.9.1
 mysqlclient>=2.0.3
 pgcli>=3.1.0
 mariadb>=1.0.7
+
+# gunicorn web server
+gunicorn>=20.1.0