diff --git a/etc/emqx.conf b/etc/emqx.conf
index cb6e91b96..5975ae542 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -614,7 +614,7 @@ zone.external.max_awaiting_rel = 100
 ## The QoS2 messages (Client -> Broker) will be dropped if awaiting PUBREL timeout.
 ##
 ## Value: Duration
-zone.external.await_rel_timeout = 60s
+zone.external.await_rel_timeout = 300s
 
 ## Default session expiry interval for MQTT V3.1.1 connections.
 ##