diff --git a/requirements.txt b/requirements.txt
index 8331506..9e1dc0b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ transaction==2.1.2
 translationstring==1.3
 venusian==1.1.0
 virtualenv==15.1.0
-waitress==1.0.2
+waitress==1.4.1
 wcwidth==0.1.7
 WebOb==1.7.2
 WebTest==2.0.27