diff --git a/requirements.txt b/requirements.txt
index 0d06629..45251a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ transaction==3.0.1
 translationstring==1.4
 urllib3==1.26.8
 venusian==3.0.0
-waitress==2.0.0
+waitress==2.1.0
 WebOb==1.8.7
 zope.deprecation==4.4.0
 zope.interface==5.4.0