diff --git a/requirements.txt b/requirements.txt
index 18fdb1a..d052624 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,6 +22,6 @@ python-socketio==4.0.2
 requests==2.21.0
 six==1.12.0
 urllib3==1.24.2
-waitress==1.3.0
+waitress==2.1.1
 Werkzeug==1.0.1
 flask_restful==0.3.8