diff --git a/requirements.txt b/requirements.txt
index 064a583..47a23fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,4 +15,4 @@ python-dateutil==2.8.0
 requests==2.22.0
 six==1.12.0
 urllib3==1.25.3
-waitress==1.3.1
+waitress==2.1.1