error when I used composer.phar update

Fatal error: Uncaught exception 'ErrorException' with message 'proc_open(): fork failed - Cannot allocate memory' in phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:985
Stack trace:
#0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', 'phar:///opt/www...', 985, Array)
#1 phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(985): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
#2 phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(804): Symfony\Component\Console\Application->getSttyColumns()
#3 phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(765): Symfony\Component\Console\Application->getTerminalDimensions()
#4 phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/C in phar:///opt/wwwroot/36lean/web/yun_course/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php on line 985

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