Apple has recently released a number of key security updates throughout the product lines

Apple security updates

For our customers’ protection, Apple doesn’t disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. This document lists recent releases.   For more information about security, see the Apple Product Security page.  Keeping your software up to date is one of the most important things you can do to maintain your Apple product’s security

The latest version of iOS is 11.4. Learn how to update the iOS software on your iPhone, iPad, or iPod touch.

The latest version of macOS is 10.13.5. Learn how to update the software on your Mac

The latest version of tvOS is 11.4. Learn how to update the software on your Apple TV

The latest version of watchOS is 4.3.1. Learn how to update the software on your Apple Watch.