diff --git a/README.md b/README.md
index f3c4d0a..0570695 100644
--- a/README.md
+++ b/README.md
@@ -247,7 +247,7 @@ INF|21|ota_mqtt_sample.c|ota_thread(342): wait for ota upgrade command...
 INF|24|ota_mqtt_sample.c|ota_thread(342): wait for ota upgrade command...
 INF|26|ota_mqtt_sample.c|ota_thread(342): wait for ota upgrade command...
 DBG|26|ota_mqtt.c|_otamqtt_upgrage_cb(110): topic=$ota/update/0WUKPUCOTC/dev001
-INF|26|ota_mqtt.c|_otamqtt_upgrage_cb(111): len=454, topic_msg={"file_size":420139,"md5sum":"de113bec77a2931b4cb3cfc42430b346","type":"update_firmware","url":"https://ota-1255858890.cos.ap-guangzhou.myqcloud.com/100005337755_0WUKPUCOTC_2.0.0?sign=q-sign-algorithm%3Dsha1%26q-ak%3DAKIDdO8ldrUa0Uts4H5Gzx6FZ9nfedjpiCd7%26q-sign-time%3D1592277704%3B1592364104%26q-key-time%3D1592277704%3B1592364104%26q-header-list%3D%26q-url-param-list%3D%26q-signature%3Dd15ec668f982ea2461316b5af6e4e86afb601b7a%00","version":"2.0.0"}
+INF|26|ota_mqtt.c|_otamqtt_upgrage_cb(111): len=454, topic_msg={"file_size":420139,"md5sum":"de113bec77a2931b4cb3cfc42430b346","type":"update_firmware","url":"https://ota.cos.ap-guangzhou.myqcloud.com","version":"2.0.0"}
 
 DBG|26|ota_client.c|IOT_OTA_StartDownload(347): to download FW from offset: 0, size: 420139
 DBG|26|ota_fetch.c|ofc_Init(86): head_content:Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8