The macOS 10.13.1 High Sierra update “improves the security, stability, and reliability of your Mac and is recommended for all users.” This is a standard message in most operating system updates, but users seldom pay heed. This time, however, Apple’s latest Mac OS includes a security update that’s essential to keeping your devices safe from KRACK.
Why you should update now
Foremost on Apple’s list of macOS updates is the addition of 70 new emojis.

You’ve heard of ransomware, denial-of-service attacks, and even phishing, but one hacking technique you may not have heard of is the KRACK exploit. This attack takes advantage of a vulnerability in WiFi networks, which puts any device with a wireless connection at risk.