diff --git a/fast_trace/basic.go b/fast_trace/basic.go
index 232b56b..5f2671a 100644
--- a/fast_trace/basic.go
+++ b/fast_trace/basic.go
@@ -61,7 +61,7 @@ var Beijing = BackBoneCollection{
 
 	CU9929: ISPCollection{
 		ISPName: CU9929,
-		IP:      "218.105.131.125",
+		IP:      "221.220.51.1",
 	},
 
 	CM: ISPCollection{