diff --git a/requirements.txt b/requirements.txt
index db59be8..419de2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ repoze.lru==0.6
 transaction==1.3.0
 translationstring==1.1
 venusian==1.0a6
-waitress==0.8.1
+waitress==1.4.3
 xlrd==0.8.0
 xlwt==0.7.4
 zope.deprecation==4.0.0