diff --git a/codes.go b/codes.go
index daa7fe5..66beb95 100644
--- a/codes.go
+++ b/codes.go
@@ -3,6 +3,7 @@ package tdx
 import (
 	"github.com/injoyai/logs"
 	"github.com/injoyai/tdx/protocol"
+	"github.com/robfig/cron/v3"
 	"os"
 	"path/filepath"
 	"time"