diff --git a/requirements.txt b/requirements.txt
index e5bc836..313a634 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -184,7 +184,7 @@ traitlets==4.3.2
 typing==3.6.4
 unicodecsv==0.14.1
 urllib3==1.22
-waitress==1.1.0
+waitress==1.4.2
 wcwidth==0.1.7
 webencodings==0.5.1
 Werkzeug==0.14.1