diff --git a/mano/requirements.txt b/mano/requirements.txt
index 62f1984..b230f3d 100644
--- a/mano/requirements.txt
+++ b/mano/requirements.txt
@@ -1,6 +1,6 @@
 requests==2.20.1
 Flask==1.0.2
-waitress==1.4.4
+waitress==2.1.1
 pymongo==3.8.0
 Flask-RESTful==0.3.7
 PyYAML==5.1