... and then take at http://laravel.com/docs/upgrade. There should be no other problems unless you have changed directly some of the core classes of laravel.
I suggest to first read notes about upgrading at http://laravel.com/docs/upgrade. Some version requires manual change. In your case you should add new option to the config file ('cipher' => MCRYPT_RIJNDAEL_256) and then change json file and composer update
thanks guys, i did check the upgrade doc.
I recently released Laravel Shift - an automated way to your upgrade Laravel projects. While the Laravel Docs contain information breaking changes, if you're looking for something more thorough and to save yourself time you should check it out.
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