Small update installed to the live servers

Today PUBG Corporation released a small patch for the main client of PlayerUnknown's Battlegrounds, which increased the stability of the servers.There was no need to disable the game servers to install the update. The developers also announced the end of season 4. Information about it appeared in the official Twitter of PUBG support service:

A small update has been applied without downtime to improve the stability of back-end systems.
Please restart Steam to download the update.
Season 4 has now come to an end and we'll be sharing information on the new season soon.https://t.co/0JdQ8Rv5gb

— PUBG Support (@PUBG_Support) October 16, 2019