Carbon, Postgres timestamp with timezone and Dates

So I have a Sequelize Postgres database that I am trying to migrate to a Laravel project (5.6+). Its created_at and updated_at uses timestamp with timezone so one of the columns looks like this: 2018-06-08 20:25:46.184-05

The problem is trying to update the updated_at column because Carbon fails due to the way it parses timestamps with milliseconds.

(and yes, I have tried those solutions.)

Here is the error when my model tries to update its timestamp of updated_at column:

InvalidArgumentException Trailing data

And here is my modal:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Books extends Model
{
    public $table = 'public.Books';

    // Postgres to conform to Carbon instances
    protected $dateFormat = 'Y-m-d H:i:s.u';
    const CREATED_AT = 'createdAt';
    const UPDATED_AT = 'updatedAt';

    protected $primaryKey = 'uuid';

    protected $guarded = [''];
}

How do I make my model (Laravel / Carbon) accept the current column type of timestamp with timezone?