php dibi pripojenie objektovo

<?php namespace Models;

class Connection
{
    protected static $connection;

    public static function getInstance() {
        if (!self::$connection) {
            self::$connection = new DibiConnection([
                'driver'   => 'mysql',
                'host'     => DB_HOST,
                'username' => DB_USERNAME,
                'password' => DB_PASSWORD,
                'database' => DB_NAME,
            ]);
        }

        return self::$connection;
    }
}

require_once 'dibi.min.php';
require_once './Models/Connection.php';

$connection = new \Models\Connection();
var_dump($connection::getInstance());

Fatal error: Class 'Models\DibiConnection' not found in C:\xxx\Models\Connection.php