diff --git a/sb.sh b/sb.sh
index ee2ed55..d8e86d5 100644
--- a/sb.sh
+++ b/sb.sh
@@ -4271,6 +4271,7 @@ rm /tmp/crontab.tmp
 }
 
 lnsb(){
+rm -rf /usr/bin/sb
 curl -L -o /usr/bin/sb -# --retry 2 --insecure https://raw.githubusercontent.com/yonggekkk/sing-box-yg/main/sb.sh
 chmod +x /usr/bin/sb
 }