diff --git a/internal/infrastructure/external/sms/sms_service.go b/internal/infrastructure/external/sms/sms_service.go
index 4c7336e..7ccdb97 100644
--- a/internal/infrastructure/external/sms/sms_service.go
+++ b/internal/infrastructure/external/sms/sms_service.go
@@ -5,7 +5,6 @@ import (
 	"crypto/rand"
 	"fmt"
 	"math/big"
-	"time"
 
 	"github.com/aliyun/alibaba-cloud-sdk-go/services/dysmsapi"
 	"go.uber.org/zap"