diff --git a/requirements.txt b/requirements.txt
index ed0d6e4b..3ef9b32e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ certifi
 browser_cookie3
 websockets
 js2py
-flask
+flask[async]
 flask-cors
 typing-extensions
 PyExecJS