diff --git a/requirements.txt b/requirements.txt
index 098513f..14d1abe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ umemcache==1.6.3
 unittest2==1.1.0
 urllib3==1.25.9
 venusian==1.0
-waitress==1.4.3
+waitress==2.1.1
 WebOb==1.7.4
 WebTest==2.0.18
 WSGIProxy==0.2.2