My composer won't update completely with Laravel 4 it gets stuck with artisan

Question

Here is the error I am getting:

Script php artisan optimize handling the post-update-cmd event returned with an error

[RuntimeException]  
Error Output:

up         


        

Answer 1

To fix this you need to install mcrypt.
In ubuntu execute the following command:

sudo apt-get install php5-mcrypt

Then update composer:

composer update