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Byzantium HF Announcement - Ethereum Blog

The Ethereum network will be undergoing a planned hard fork at block number 4.37mil (4,370,000) , which will likely occur between 12:00 UTC and 13:00 UTC on Monday, October 16, 2017 . The Ropsten test network underwent a hard fork on September 19th (UTC) at block number 1.7mil (1,700,000). A countdown timer can be seen at .