diff --git a/examples/transaction/main.go b/examples/transaction/main.go
index 2a977d3..8717997 100644
--- a/examples/transaction/main.go
+++ b/examples/transaction/main.go
@@ -12,7 +12,7 @@ import (
 )
 
 var ctx = context.Background()
-var cli = sui.NewSuiClient(constant.BvMainnetEndpoint)
+var cli = sui.NewSuiClient(constant.BvTestnetEndpoint)
 
 func main() {
 	//SuiGetTotalTransactionBlocks()
@@ -143,7 +143,7 @@ func SuiGetTotalTransactionBlocks() {
 
 func SuiGetTransactionBlock() {
 	rsp, err := cli.SuiGetTransactionBlock(ctx, models.SuiGetTransactionBlockRequest{
-		Digest: "AhZYEiFFQtv5i1nLaURHiyvQNiyUBzNCHodnKFxgc2Lf",
+		Digest: "DjubVWzkndWDTzcWVd6g3xbQsfG3H2Gt7vMfrm1YjLNJ",
 		Options: models.SuiTransactionBlockOptions{
 			ShowInput:          true,
 			ShowRawInput:       true,
diff --git a/models/read_system.go b/models/read_system.go
index 37e9433..a6927d9 100644
--- a/models/read_system.go
+++ b/models/read_system.go
@@ -189,7 +189,7 @@ type SuiSystemStateSummary struct {
 	InactivePoolsSize                     string                `json:"inactivePoolsSize"`
 	ValidatorCandidatesId                 string                `json:"validatorCandidatesId"`
 	ValidatorCandidatesSize               string                `json:"validatorCandidatesSize"`
-	AtRiskValidators                      []string              `json:"atRiskValidators"`
+	AtRiskValidators                      []interface{}         `json:"atRiskValidators"`
 	ValidatorReportRecords                [][]interface{}       `json:"validatorReportRecords"`
 }