Ethereum Fusaka hard fork to be launched by the end of 2025 Tomasz Kajetan Sta ń czak, the joint executive director of Ethereum, revealed in a post that the Fusaka hard fork upgrade plan is scheduled to be implemented in the third or fourth quarter of 2025, but the specific time has not yet been finalized. Core developer Tim Beiko announced on the same day that the controversial EVM Object Format (EOF) upgrade has been removed from Fusaka due to technical uncertainty that may affect the upgrade progress.