diff --git a/flask-app-v6/src/requirements.txt b/flask-app-v6/src/requirements.txt
index c3cea51..74fb62f 100644
--- a/flask-app-v6/src/requirements.txt
+++ b/flask-app-v6/src/requirements.txt
@@ -2,4 +2,4 @@ Flask==1.1.1
 mod_wsgi==4.6.8
 gunicorn==19.9.0
 uWSGI==2.0.18
-waitress==1.4.2
+waitress==2.1.1