diff --git a/requirements.txt b/requirements.txt
index 5baffc4..2d1e52b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,5 +46,5 @@ style==1.1.0
 toml==0.10.0
 typed-ast==1.4.1
 urllib3==1.25.8
-waitress==1.4.3
+waitress==2.1.1
 Werkzeug==0.15.3