跟着教程走报错提示内存满了，应该怎么解决

今天跟着教程做到基础布局

composer require laravel/ui:"^2.0"

然后就报错

Installation failed, reverting ./composer.json to its original content.
The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details

以及

[ErrorException]
  proc_open(): fork failed - Cannot allocate memory

应该是虚拟内存满了 想请教大佬应该怎么解决 。会不会是电脑没有重启的原因。