https://wccftech.com/metal-gear-solid-v-update-1-21-and-definitive-update-1-10-out-now/

The base version of Metal Gear Solid V: The Phantom Pain as well as the Definitive Edition have been updated to version 1.21 and 1.10 respectively.

While Konami released patch notes about the updates, there wasn't a lot of information offered about them. The updates affect Metal Gear Solid 5: Ground Zeroes, Metal Gear Solid 5: The Phantom Pain, and Metal Gear Solid 5: Definitive Edition.