diff --git a/requirements.txt b/requirements.txt
index 302c33f..a6be34b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ requests==2.19.1
 rocket-errbot==1.2.5
 six==1.11.0
 urllib3==1.23
-waitress==1.4.2
+waitress==1.4.3
 WebOb==1.8.2
 WebTest==2.0.30
 Werkzeug==0.14.1