Update request not updating

Hello everyone,

I am working on a Lumen API but for some reason one of the UPDATE requests is not updating correctly. I have created an object for the objects it selfs which is working fine. But in that object I want the user to be able to add locations.

public function update(Request $request, $id, $locatieId) {
      
      // this is returning the location id
      $locatie = Location::find($locatieId);
      $updated = $locatie->update($request->all());
      return response()->json(['updated' => $updated]);
    }

The url which I am posting to is: http://api.localhost.nl/objecten/2/locaties/1

And this is the model for the location:

namespace App;
use Illuminate\Database\Eloquent\Model;

class Location extends Model
{
    protected $fillable = [
                            'longitude',
                            'latitude'
                          ];

    protected $table = 'location';
    protected $hidden = array('object_id');

    public function object(){
      return $this->belongsTo('App\Object');
    }
}

When I post the following code, it returns {"update" : true} but nothing is happening:

[
    {
        "longitude": "11",
        "latitude": "22"
    }
]