diff --git a/tests/cdc-bank/bank.go b/tests/cdc-bank/bank.go
index 75d88862..e03faece 100644
--- a/tests/cdc-bank/bank.go
+++ b/tests/cdc-bank/bank.go
@@ -22,7 +22,6 @@ import (
 	"time"
 
 	"github.com/ngaut/log"
-
 	"github.com/pingcap/tipocket/pkg/cluster"
 	"github.com/pingcap/tipocket/pkg/core"
 	"github.com/pingcap/tipocket/util"
@@ -49,7 +48,7 @@ func (c ClientCreator) Create(_ cluster.ClientNode) core.Client {
 
 const initBalance int = 1000
 const regions int = 16
-const validateConcurrency int = 32
+const validateConcurrency int = 1
 
 type client struct {
 	*Config