Laravel email update validation

I have problem updating my email. id, prn, rfid_number works fine. But in email. I got a problem. Here's my validation:

$validate = $request -> validate([
  'id' => 'required|numeric|unique:users,id,'.$user -> id,
  'email' => 'required|email|unique:users,email,'.$user -> email,
  'prn' => 'required|numeric|unique:users,prn,'.$user -> prn,
  'rfid_number' => 'required|numeric|unique:users,rfid_number,'.$user -> rfid_number
]);

Entering email which is not in the database works fine. But when I enter the email of the existing model. "The email has already been taken." shows

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