diff --git a/src/business-profile/business-profile.service.ts b/src/business-profile/business-profile.service.ts
index 95cfcd4..ae8fca0 100644
--- a/src/business-profile/business-profile.service.ts
+++ b/src/business-profile/business-profile.service.ts
@@ -494,7 +494,7 @@ export class BusinessProfileService {
         province: item.province.trim(),
         city: item.city.trim(),
         address: item.address.trim(),
-        postalCode: item.postalCode.trim(),
+        postalCode: item.postalCode?.trim() || null,
         landline: item.landline?.trim() || null,
       };
 
diff --git a/src/business-profile/dto/update-business-profile.dto.ts b/src/business-profile/dto/update-business-profile.dto.ts
index 40f1f4e..35e1442 100644
--- a/src/business-profile/dto/update-business-profile.dto.ts
+++ b/src/business-profile/dto/update-business-profile.dto.ts
@@ -71,9 +71,10 @@ class BusinessAddressDto {
   @MinLength(1)
   address!: string;
 
+  @IsOptional()
   @IsString()
-  @MinLength(1)
-  postalCode!: string;
+  @MaxLength(20)
+  postalCode?: string | null;
 
   @IsOptional()
   @IsString()