Ethereum core developers scheduled the Fusaka mainnet upgrade for November 5, with key testnets in September and October. Planning for the next upgrade, Glamsterdam, is already underway.
Key Takeaways
Ethereum’s Fusaka mainnet upgrade is scheduled for November 5, 2025.
Candidate release clients will be ready by September 1, with public testnet upgrades on Sept. 15, Sept. 22, and Oct. 6.
Developers are reviewing proposals for the Glamsterdam upgrade, including EIP-7732, EIP-7783, and EIP-7805.
Ethereum Confirms Fusaka Upgrade Timeline
Ethereum core developers have set November 5, 2025, as the launch date for the Fusaka mainnet upgrade, according to Christine Kim’s summary of the 161st Ethereum Consensus Core Developers Meeting (ACDC).
The roadmap includes:
Sept. 1: Candidate release client ready
Sept. 15, 22, and Oct. 6: Public testnet upgrades
Nov. 5: Fusaka mainnet upgrade
The Fusaka hard fork aims to improve Ethereum’s efficiency and scalability while laying groundwork for future upgrades.
Glamsterdam Upgrade Discussions Begin
Beyond Fusaka, Ethereum developers are already preparing for the Glamsterdam upgrade. A shortlist of headline proposals is under review:
EIP-7732 (ePBS): Enhances proposer-builder separation.
EIP-7783: Proposes reducing slot times to six seconds.
EIP-7805 (FOCIL): Aims to improve consensus and finality efficiency.
Final decisions on Glamsterdam’s features will be made at the August 8 ACDC meeting.
Developer Debate on ePBS
One key topic in the meeting was the ePBS “free option” issue. Developers noted that extending the block verification window may allow builders to cancel blob transactions at the last minute, potentially raising the empty block rate to gain financial benefits.
