diff --git a/requirements.txt b/requirements.txt
index 5a7cf7c..2ce7ee2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -125,7 +125,7 @@ tornado==6.0.4
 tqdm==4.30.0
 traitlets==4.3.3
 urllib3==1.25.10
-waitress==1.4.4
+waitress==2.1.1
 wcwidth==0.2.5
 webencodings==0.5.1
 Werkzeug==1.0.1