Vagrant 使用 PD9 作为 Provider 怎么更新 Parallels Tools？

提示如下：

The Parallels Tools on this VM do not match the installed version of
==> default: Parallels Desktop! In most cases this is fine, but in rare cases it can
==> default: cause things such as shared folders to not work properly. If you see
==> default: shared folder errors, please update the Parallels Tools within the
==> default: virtual machine and reload your VM.
==> default:
==> default: Parallels Tools Version: 9.0.24215.978862
==> default: Parallels Desktop Version: 9.0.24229.991745


提示写的很清楚，让我更新虚拟机中的 Parallels Tools，问题是怎么在虚拟机中更新呀？

哪位同学以前搞过的麻烦给我指点下 :)