./composer.phar update
Loading composer repositories with package information
Warning from https://repo.packagist.org: Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2. See https://blog.packagist.com/deprecating-composer-1-support/
Updating dependencies (including require-dev)
PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) in phar:///var/www/documentroot/composer.phar/src/Composer/DependencyResolver/RuleSetGenerator.php on line 129