https://wccftech.com/pubg-pc-5-1-brings-changes-to-miramar-performance-improvements/

A new PUBG PC update is now live on the test server, bringing major changes to one of the game's maps as well as new gameplay tweaks.

The biggest changes introduced by the PUBG 5.1 update are tweaks to the Miramar map. Item spawn balance has also been changed.