diff --git a/requirements.txt b/requirements.txt
index e209de8..c216b6e 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==2.1.1
 WebOb==1.8.2
 WebTest==2.0.30
 Werkzeug==0.14.1