Ethereum is heading into one of its most important upgrades yet. On December 3, 2025, the network will activate the Fusaka hard fork, a step that could redefine its scalability and efficiency for years to come.
The upgrade has already been locked in after confirmation during the most recent Ethereum AllCoreDevs call. Before mainnet launch, Fusaka will be tested on Holesky, Sepolia, and Hoodi from October to mid-November — a crucial stage to iron out any issues before going live.
What Fusaka Brings to the Table
The headline feature of Fusaka is EIP-7594, better known as PeerDAS. This new data availability protocol is expected to effectively double Ethereum’s throughput. In practice, that means transactions will settle faster, Layer 2 networks will have more bandwidth to expand, and the overall developer experience will improve.
But PeerDAS isn’t the only story. Fusaka also includes gradual improvements to blob storage, which was first introduced with the Dencun upgrade in 2024. Over the course of two weeks after Fusaka goes live, Ethereum will expand blob capacity step by step, allowing the network to smoothly adjust to heavier workloads without risking instability.
Finally, security remains a top priority. The Ethereum Foundation has launched a four-week audit program with a $2 million bounty attached, a clear sign of how seriously the community takes this upgrade. Ethereum has learned from the past: a rushed release with vulnerabilities could have long-lasting consequences, so careful preparation is part of the process.
How Fusaka Fits Into Ethereum’s Story
To understand Fusaka’s importance, it helps to see it as part of Ethereum’s longer journey. The Merge in 2022 was a turning point that made the network environmentally sustainable by shifting to proof-of-stake. Dencun in 2024 introduced blobs, opening a path for scalable data handling. Fusaka takes that foundation and pushes it further, turning the idea of data efficiency into something that can support real-world adoption.
This upgrade is not happening in isolation. Ethereum’s developers are already looking ahead to Glamsterdam, planned for 2026, which will push scalability and security even further. But Fusaka feels like the bridge between where Ethereum has been and where it wants to go: a network capable of supporting not just millions, but potentially billions of users and applications.
Why This Matters Beyond Developers
Scalability upgrades like Fusaka often sound technical — throughput, blob storage, EIPs. But the real impact is broader. Faster and cheaper transactions open new doors for DeFi, gaming, NFTs, and enterprise use cases. They make Layer 2 networks more sustainable, meaning end-users can enjoy smoother experiences without thinking about gas fees. They also reassure institutions that Ethereum is not standing still, but constantly evolving to meet growing demand.
In short, Fusaka strengthens Ethereum’s claim as the leading smart contract platform in a world where competition is heating up. Networks like Solana and Avalanche have made scalability part of their pitch, but Ethereum continues to adapt without losing its core principles of decentralization and security.
NOWNodes and the Road Ahead
At NOWNodes, we see Fusaka as more than just another upgrade. It’s a sign of Ethereum’s resilience and its ability to set standards for the rest of the blockchain space. That’s why our Ethereum nodes and explorers will be updated and ready from day one, ensuring developers, businesses, and communities can rely on stable infrastructure without interruption.
We believe Ethereum’s story is still in its early chapters. Fusaka is another page being written, and it’s one that shows the network is not only surviving but thriving. And as Ethereum evolves, we’ll continue to provide the tools and infrastructure that keep builders connected to its heartbeat.
