diff --git a/appengine/flexible/websockets/requirements.txt b/appengine/flexible/websockets/requirements.txt
index c1525d36077..4574164977d 100644
--- a/appengine/flexible/websockets/requirements.txt
+++ b/appengine/flexible/websockets/requirements.txt
@@ -1,4 +1,4 @@
-Flask==1.1.4 # it seems like Flask-sockets doesn't play well with 2.0+
+Flask==3.1.3 # it seems like Flask-sockets doesn't play well with 2.0+
 Flask-Sockets==0.2.1
 gunicorn==23.0.0
 requests==2.31.0