Today, Apple came out with a small OS update for both IOS devices and Macs. For the Mac, 10.11.3 is now out which improves the stability, compatibility, and security of your Mac. It is about 1.47GB in size. If you want specifics:
This 10.11.3 update:
Fixes an issue that may prevent some Mac computers from waking from sleep when connected to certain 4K displays.
Third-party .pkg file receipts stored in /var/db/receipts are now retained when upgrading from OS X Yosemite.
For iPhone, iPad, and iPod touch, iOS 9.2.1 is now out which provides non-specific security and bug fixes and also fixes an MDM server issue where apps failed to download. It is just over 40MB in size.
Although these are not the updates a lot of users have been hearing rumors about (and witnessing in beta forms) which will offer some new features, security improvements are always welcome.
So far we have not seen any issues with these updates.