diff --git a/pyramid-tutorial-master/requirements.txt b/pyramid-tutorial-master/requirements.txt
index 14a60f3..f2ca56e 100644
--- a/pyramid-tutorial-master/requirements.txt
+++ b/pyramid-tutorial-master/requirements.txt
@@ -21,7 +21,7 @@ repoze.lru==0.5
 transaction==1.3.0
 translationstring==1.1
 venusian==1.0a6
-waitress==0.8.1
+waitress==2.1.1
 wsgiref==0.1.2
 zc.lockfile==1.0.0
 zdaemon==3.0.1