If you get this error when you trying to run "composer update":

PHP Fatal error:  Out of memory (allocated 265289728) (tried to allocate 20480 bytes) in phar:///usr/local/bin/composer/src/Composer/Repository/ComposerRepository.php on line 339

- This could be happening because the instance runs out of memory and has no Swap space enabled...

- To fix that run this scrips:

$ sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
$ sudo /sbin/mkswap /var/swap.1
$ sudo /sbin/swapon /var/swap.1

- And then run:

$ composer update