diff --git a/pip_requirements.txt b/pip_requirements.txt
index 974826b..de28e17 100644
--- a/pip_requirements.txt
+++ b/pip_requirements.txt
@@ -27,7 +27,7 @@ rocket-errbot==1.2.5
 six==1.10.0
 slackclient==1.0.7
 urllib3==1.22
-waitress==1.0.2
+waitress==1.4.2
 WebOb==1.7.3
 websocket-client==0.44.0
 WebTest==2.0.28