diff --git a/cmd/Open-IM-SDK-Core b/cmd/Open-IM-SDK-Core
index bdb27fcff..855e89361 160000
--- a/cmd/Open-IM-SDK-Core
+++ b/cmd/Open-IM-SDK-Core
@@ -1 +1 @@
-Subproject commit bdb27fcff0e9785cb0f92d9d04bdafe544a04de0
+Subproject commit 855e893610c905e3105484c3519613b993301bd2
diff --git a/config/config.yaml b/config/config.yaml
index da820f3c5..08fb9d7e4 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -450,7 +450,8 @@ notification:
 
 #---------------demo configuration---------------------#
 #The following configuration items are applied to openIM Demo configuration
-demoswitch: true #是否启动demo，如果自身没有账号体系，设置为true
+#是否启动demo，如果自身没有账号体系，设置为true
+demoswitch: true
 demo:
   openImDemoPort: [ 42233 ] #demo对外服务端口，默认即可，需要开放此端口或做nginx转发
   alismsverify: #阿里云短信配置，在阿里云申请成功后修改以下四项，必须修改