diff --git a/model/dto/req/tower_dto.go b/model/dto/req/tower_dto.go
index bb04a63..a91ddc2 100644
--- a/model/dto/req/tower_dto.go
+++ b/model/dto/req/tower_dto.go
@@ -11,7 +11,7 @@ type TowerDTO struct {
 
 type UpdateTowerDTO struct {
     DeviceID  *string  `json:"device_id,omitempty" validate:"omitempty,min=3"` 
-    TowerCode *string  `json:"tower_code,omitempty" validate:"omitempty,alphanum"` 
+    TowerCode *string  `json:"tower_code,omitempty" validate:"omitempty"` 
     Longitude *float64 `json:"longitude,omitempty" validate:"omitempty,longitude"` 
     Latitude  *float64 `json:"latitude,omitempty" validate:"omitempty,latitude"` 
 }
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