composer require - cannot allocate memory

Estou tentando instalar o Lumen para criar um projeto em um servidor compartilhado e está dando o erro do código

php71 -c /home/test/php.ini composer.phar global require "laravel/lumen-installer"
Changed current directory to /home/storage/1/ba/6b/test/.composer
Using version ^1.1 for laravel/lumen-installer
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)

mmap() failed: [12] Cannot allocate memory
PHP Fatal error:  Out of memory (allocated 215425024) (tried to allocate 4096 bytes) in phar:///home/storage/1/ba/6b/test/composer.phar/src/Composer/Repository/ComposerRepository.php on line 597

Fatal error: Out of memory (allocated 215425024) (tried to allocate 4096 bytes) in phar:///home/storage/1/ba/6b/test/composer.phar/src/Composer/Repository/ComposerRepository.php on line 597

mmap() failed: [12] Cannot allocate memory
PHP Fatal error:  Out of memory (allocated 215425024) (tried to allocate 4096 bytes) in phar:///home/storage/1/ba/6b/test/composer.phar/src/Composer/Console/Application.php on line 80

Fatal error: Out of memory (allocated 215425024) (tried to allocate 4096 bytes) in phar:///home/storage/1/ba/6b/test/composer.phar/src/Composer/Console/Application.php on line 80

já alterei o memory _limit no php.ini que foi a solução que encontrei, mas mesmo assim tá dando erro