diff --git a/backend/requirements.txt b/backend/requirements.txt
index 237ba79..2cf2601 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -3,5 +3,5 @@ Flask==1.1.1
 itsdangerous==1.1.0
 Jinja2==2.10.3
 MarkupSafe==1.1.1
-waitress==1.3.1
+waitress==2.1.1
 Werkzeug==0.16.0