diff --git a/apps/authentication/api/v1/serializers/serializer.py b/apps/authentication/api/v1/serializers/serializer.py
index 0d5a05c..a1cec6e 100644
--- a/apps/authentication/api/v1/serializers/serializer.py
+++ b/apps/authentication/api/v1/serializers/serializer.py
@@ -105,8 +105,16 @@ class UserSerializer(serializers.ModelSerializer):
         mobile = attrs['mobile']
         national_code = attrs['national_code']
 
-        if self.Meta.model.objects.filter(Q(mobile=mobile) | Q(national_code=national_code)).exists():
-            raise UserExistException()
+        if not self.instance:
+            if self.Meta.model.objects.filter(Q(mobile=mobile) | Q(national_code=national_code)).exists():
+                raise UserExistException()
+        elif self.instance:
+            if self.instance.mobile != mobile:
+                if self.Meta.model.objects.filter(mobile=mobile).exists():
+                    raise UserExistException()
+            if self.instance.national_code != national_code:
+                if self.Meta.model.objects.filter(national_code=national_code).exists():
+                    raise UserExistException()
 
     def to_representation(self, instance):
         """ Custom output """