Fusaka mainnet launch is scheduled for early November
Public testnet upgrades begin in late September
The upgrade focuses on network scalability and efficiency
Ethereum developers have finalized the timeline for the highly anticipated Fusaka upgrade, aimed at enhancing the network’s scalability and performance. The mainnet rollout is expected in early November 2025, while public testnet upgrades are set to begin in late September. This upgrade comes as Ethereum continues to evolve post-Merge, pushing toward a more efficient and scalable infrastructure.
The Fusaka upgrade is part of Ethereum’s broader roadmap to optimize the network and reduce congestion. It brings in improvements designed to prepare Ethereum for more rollups and high-throughput dApps, making it a significant step forward in the network’s evolution.
Testnet Rollouts Start in September
According to Ethereum core developers, Fusaka will be rolled out across three main public testnets throughout late September and October. These include Sepolia, Goerli, and Holesky testnets. The purpose of this phase is to identify any bugs or unexpected behavior in a controlled environment before the final deployment to mainnet.
Developers and node operators are encouraged to participate actively in testing to ensure a smooth upgrade process. Based on past upgrades like Shanghai and Dencun, the timeline for testnet to mainnet deployment typically spans around six weeks, making the early November mainnet launch feasible.
UPDATE: Ethereum devs agree on Fusaka upgrade timeline for early November mainnet launch, with public testnet upgrades starting late September. pic.twitter.com/lVrRWWA4bM
— Cointelegraph (@Cointelegraph) July 21, 2025
What Fusaka Means for the Ethereum Ecosystem
The Fusaka upgrade is designed to improve data availability, which is essential for Ethereum’s rollup-centric scaling strategy. By optimizing how data is processed and stored on the network, Fusaka will reduce costs for layer-2 solutions and improve transaction throughput across the ecosystem.
This move signals Ethereum’s ongoing commitment to its modular roadmap and improving user experience across decentralized applications. If Fusaka’s implementation goes smoothly, it will set the stage for even more advanced updates in 2026.
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