diff --git a/requirements.txt b/requirements.txt
index a343163..6115526 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ itsdangerous==1.1.0
 Jinja2==2.11.2
 MarkupSafe==1.1.1
 PyMySQL==0.9.3
-waitress==1.4.3
+waitress==2.1.1
 Werkzeug==1.0.1
 google-auth==1.15.0
 requests==2.23.0