diff --git a/requirements.txt b/requirements.txt
index f09e263..19fe9ce 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -93,7 +93,7 @@ typing==3.6.2
 tzlocal==1.4
 uritemplate==3.0.0
 urllib3==1.21.1
-waitress==1.0.2
+waitress==2.1.1
 wcwidth==0.1.7
 WebOb==1.7.3
 websocket==0.2.1