Ethereum developers have announced a new date for the long-awaited network upgrade, known as Fusaka, which is now scheduled to go live on December 3, 2025 (tentatively).
Fusaka was originally expected to be ready between November 5th and 12th of this year, but the developers decided to delay this event for another month. The changes brought by this hard fork are intended to improve scalability, efficiency, and the overall user experience on Ethereum, one of the most significant cryptocurrency networks globally.
The process will begin in two days, on September 22nd, with the "code freeze." This means that, starting on that date, developers will stop introducing new features or significant changes to the update code. The rest of the tentative roadmap is as follows:
• Sept 25 – release of testnet clients.
• Oct 1 – Holesky fork.
• Oct 14 – Sepolia fork.
• Oct 28 – Hoodi fork.
• Nov Principles – mainnet clients.
• Dec 3 – Fusaka activated on mainnet.
Developer call discussing the update roadmap.
The upgrade, which combines improvements to the Fulu consensus layer and the Osaka execution layer, introduces 13 Ethereum Improvement Proposals (EIPs). Among the most notable is EIP-7594, which will implement the PeerDAS (Data Availability Sampling) system. This technology will allow nodes to specialize in storing different types of data, dramatically reducing transaction costs on Layer 2 networks such as Arbitrum and Base.
In addition, Fusaka will bring other important optimizations. EIP-7642 will remove the requirement for nodes to store stale data, speeding up synchronizations. Meanwhile, EIP-7823 and EIP-7883 are designed to protect the network from denial-of-service (DoS) attacks by limiting data inflow. Gas limits will also be adjusted with EIP-7825 and EIP-7935, setting a smaller limit for individual transactions but a higher limit for blocks, in order to increase network capacity without compromising its security.
Developers are also working on EIP-7951, which promises to improve the user experience on hardware wallets and mobile devices running iOS and Android , making the network more accessible to a wider audience. Overall, the Fusaka upgrade is expected to transform Ethereum into a lighter, faster, and more decentralized network, laying the groundwork for future upgrades such as "Glamsterdam" in 2026.
