diff --git a/requirements.txt b/requirements.txt
index 3ea7316..ad797ce 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ terminado==0.8.1
 testpath==0.3
 tornado==4.4.2
 traitlets==4.3.1
-waitress==1.0.2
+waitress==2.1.1
 wcwidth==0.1.7
 Werkzeug==0.11.15
 widgetsnbextension==1.2.6