diff --git a/requirements.txt b/requirements.txt
index e0d69b5..7b68a31 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ typing==3.7.4.1
 ujson==1.35
 urllib3==1.25.8
 venusian==3.0.0
-waitress==1.4.2
+waitress==1.4.3
 WebOb==1.8.6
 zope.deprecation==4.4.0
 zope.interface==4.7.1