diff --git a/requirements.txt b/requirements.txt
index 43c4930..b1ed909 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,5 @@ itsdangerous==1.1.0
 Jinja2==2.10
 MarkupSafe==1.1.0
 mysqlclient==1.3.13
-waitress==1.4.3
+waitress==2.1.1
 Werkzeug==0.14.1