diff --git a/requirements.txt b/requirements.txt
index 7c57cc8..211aa4d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ six==1.13.0
 toml==0.10.0
 typed-ast==1.4.0
 urllib3==1.25.7
-waitress==1.4.3
+waitress==2.1.1
 wcwidth==0.1.7
 Werkzeug==0.16.0
 zipp==0.6.0