diff --git a/requirements.txt b/requirements.txt
index ee91103..235883d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,5 +26,5 @@ six==1.11.0
 smart-open==1.5.7
 tika==1.16
 urllib3==1.23
-waitress==1.1.0
+waitress==1.4.1
 Werkzeug==0.14.1