19 September 2025 – Ethereum’s next major hard fork, Fusaka, has officially been scheduled for December 3, 2025, marking the network’s third major upgrade in under two years. Positioned as a technical, infrastructure-focused update, Fusaka introduces several Ethereum Improvement Proposals (EIPs) aimed at enhancing scalability, validator efficiency, and Layer 2 performance, all without disrupting existing dApps or contracts.
Key Takeaways
Ethereum’s Fusaka upgrade is now confirmed for December 3, 2025, following earlier estimates around November.
The update focuses on backend scalability and performance with features like PeerDAS, blob parameter updates, and Verkle trees.
This is a non-disruptive hard fork designed to enhance Layer 2 performance, not introduce user-facing dApp changes.
Fusaka is part of Ethereum’s regular upgrade cycle and will be followed by “Glamsterdam” in early 2026.
What Is Fusaka?
Fusaka is the successor to May’s Pectra upgrade and part of Ethereum’s accelerated six-month development cadence. While it avoids flashy, user-facing features, it brings important behind-the-scenes changes to improve the Ethereum protocol’s speed, data availability, and node usability.
Fusaka focuses on:
PeerDAS (data availability sampling)
Validator performance
Blob data scaling for L2s
Gas efficiency and execution layer enhancements
Broader client and node accessibility
The name “Fusaka” continues Ethereum’s tradition of naming upgrades after global locations, although its exact reference remains undisclosed.
Confirmed Activation Date
While early developer discussions suggested a November rollout, recent confirmations from Ethereum Foundation contributors and dev team calls now set the official mainnet activation for December 3, 2025. This date allows for more thorough testnet evaluations and ensures stability prior to Devconnect Buenos Aires, which begins on November 17.
Key Features Of The Ethereum Fusaka Upgrdade
Testing Timeline and Development
Ethereum’s dev teams have followed a structured rollout process:
Devnet-3 testing began in July 2025
Holesky testnet activated in September (to be deprecated post-Fusaka)
Bug bounty program launched on September 17 with $2 million in rewards via Sherlock, Lido, and Gnosis
Public testnets will continue running through October for final stability assessments
This mirrors the Pectra and Dencun upgrades, which also followed staged testnet launches and public bounty programs.
Developer and Community Outlook
The Ethereum development community has emphasized incremental, production-ready delivery to avoid delays and ensure smooth transitions. Fusaka’s success will be measured less by immediate hype and more by its long-term impact on:
Lower rollup costs
Increased node decentralization
Higher transaction efficiency
Better integration with Web2 infrastructure
The upgrade aligns with Ethereum’s “Surge” roadmap phase, which targets scaling and decentralization. Following Fusaka, the next planned upgrade is Glamsterdam, expected in early 2026.
Market and Ecosystem Relevance
Fusaka won’t change how most users interact with Ethereum, but it significantly enhances the protocol’s backend capabilities. Key benefits include:
Rollup fees drop further due to expanded blob capacity
Node operators see reduced hardware requirements
Developers benefit from lower gas costs and easier deployment
Security researchers get better audit tools via stateless structures
Sentiment around the upgrade is positive, especially among developers and rollup teams who rely on Ethereum’s Layer 1 as a settlement and data layer.
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