Just a minor improvement to the Parrot Security 3.x series of the Linux-based operating system used by security researchers for various pentesting and ethical hacking tasks, Parrot Security OS 3.9 is here with all the latest security patches and bug fixes released upstream in the Debian GNU/Linux repositories. But it also looks like it ships with some important new features that promise to make the ethical hacking computer operating system more secure and reliable. One of these is a new sandbox system based on the Firejail SUID program and designed to add an extra layer of protection to many apps, protecting users from 0day attacks.