composer updateでmemoryが足りない場合の対応方法

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$ composer update

...
Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 268435456 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/Solver.php on line 220

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 php -d memory_limit=-1 /usr/local/bin/composer update