diff --git a/requirements.txt b/requirements.txt
index c08e688..e8070b5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 gunicorn==25.1.0
-Flask>=2.0.3,<3.0.0
+Flask>=2.0.3,<4.0.0
 Flask-MQTT==1.1.1
 Flask-OAuthlib==0.9.6
 Flask-SQLAlchemy>=3.0.0,<4.0.0