Planned server maintenance will take place on:
June 07 at 9:30 AM (New York, EDT)
June 07 at 2:30 PM (Central European Time, CEST)
June 07 at 4:30 PM (Moscow, MSK)
June 07 at 9:30 PM (Beijing, CST)
June 07 at 10:30 PM (Tokyo, JST)
Upcoming server update
Source: Steam Community (opens in a new tab)