Fusaka is activated: Ethereum enters a new era
Thu Dec 04 2025 ▪ 4 min read
On December 3, 2025, Ethereum reached an important milestone with the activation of Fusaka, its most ambitious upgrade in years. With the promise of greater scalability, reduced fees, and an improved user experience, this technical evolution has generated excitement among investors and developers. Here we present an analysis of an event that could redefine the future of cryptocurrencies.
In brief
Fusaka is now active on Ethereum since December 3, successfully implemented to increase accumulation capacity by 8 and reduce transaction costs.
Fusaka's improvements include PeerDAS, a higher gas limit, and access key signatures, optimizing scalability and user experience.
Ethereum Fusaka could drive ETH adoption and influence its price, with expected impacts on Layer 2 and the crypto ecosystem.
Ethereum Fusaka is finally here: a retrospective look at a historic day
The Fusaka upgrade was successfully implemented on December 3, 2025, at 21:49 UTC, marking a turning point for Ethereum. After months of testing and anticipation, the crypto community followed its live activation on social media and through a live YouTube stream organized by the Vitalik Buterin team. Unlike previous upgrades, Fusaka was deployed in just 15 minutes, with no significant network disruptions, demonstrating the growing maturity of the ecosystem.
This update carries a symbolic name, Fusaka, which merges Fulu (consensus layer) and Osaka (execution layer), in tribute to Devcon 2025, held in Japan. Developers highlighted the importance of this step, which is part of Ethereum's long-term roadmap.
