How to update recode in many to many relation Laravel

Business Model

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Business extends Model
{
    use HasFactory;

 /**
         * The roles that belong to the Business
         *
         * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
         */
        public function cat()
        {
            return $this->belongsToMany(BusinessCategory::class, 'cat_business',  'business_id' , 'cat_id');
        }

}

Business Category Model

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Models\Business;

class BusinessCategory extends Model
{

    use HasFactory;
    protected $guarded = [];

    public function business()
    {
        return $this->belongsToMany(Business::class, 'cat_business','business_id', 'cat_id' );
    }
}

Trying to use updateexistingpivot

 $business = Business::find($id);
  $business->cat()->updateExistingPivot($request->cat_id );

Error

Too few arguments to function Illuminate\Database\Eloquent\Relations\BelongsToMany::updateExistingPivot(), 1 passed in D:\xampp\htdocs\finallisting\app\Http\Controllers\BusinessController.php on line 194 and at least 2 expected

What Would be Second Parameter of Povit relation

      $business->cat()->updateExistingPivot($request->cat_id , [Second Perameter??] );