This document provides an overview and update on the MITRE ATT&CK framework. It discusses the growth and updates made to ATT&CK in 2019, including the addition of 43 new techniques and 1 new tactic. It also previews upcoming work on implementing sub-techniques to provide more granular detail within techniques, and expanding ATT&CK to new domains like cloud computing and industrial control systems. The large community contribution to ATT&CK is also acknowledged.