The link below has information on the latest version of the Ultimate Inventory System. This version adds compatibility with Unity 6.5. If you are not using Unity 6.5 there are no other changes.
opsive.com
This update has been released on the Opsive Store and will be on the Asset Store soon.
Ultimate Inventory System 1.3.8 Released - Opsive
The latest version of the Ultimate Inventory System is making its way to the Opsive Store and the Asset Store. If you are upgrading from . . .
opsive.com
This update has been released on the Opsive Store and will be on the Asset Store soon.