diff --git a/requirements.txt b/requirements.txt
index 27dcb23..77fe35e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -110,7 +110,7 @@ txaio==20.4.1
 typing-extensions==3.7.4.2
 urllib3==1.24.3
 virtualenv==20.0.18
-waitress==1.4.3
+waitress==2.1.1
 wcwidth==0.1.9
 webencodings==0.5.1
 widgetsnbextension==3.5.1