Ethereum Fusaka upgrade activates on Hoodi testnet, marking the final pre-mainnet test before year-end launch. This hard fork enhances scalability by expanding block gas limits and blob capacity, while introducing PeerDAS for efficient data verification, boosting efficiency and security for Layer 2 solutions.
-
Hoodi testnet activation completes third and final testing phase for Fusaka.
-
Upgrade includes EIP-7594 for Peer Data Availability Sampling, reducing validator data download needs.
-
Mainnet launch targeted for December 3, following audit contest with up to $2 million in rewards uncovering key vulnerabilities.
Ethereum Fusaka upgrade live on Hoodi testnet, paving way for mainnet scalability boost. Learn how this hard fork enhances efficiency, security, and Layer 2 support—essential for developers and enterprises. Stay updated on Ethereum’s roadmap today.
What is the Ethereum Fusaka Upgrade?
Ethereum Fusaka upgrade is the network’s next major hard fork, designed to improve scalability, efficiency, and security on the world’s leading smart contract platform. Activated on the Hoodi testnet on October 28, 2025, at approximately 18:53 UTC, it follows successful tests on Holesky and Sepolia earlier in the month. This upgrade introduces key Ethereum Improvement Proposals to handle increased transaction volumes and enhance data availability for Layer 2 ecosystems.
How Does PeerDAS Improve Ethereum’s Data Availability?
The Ethereum Fusaka upgrade incorporates EIP-7594, known as Peer Data Availability Sampling or PeerDAS, which allows validators to verify large datasets by sampling small portions from peer nodes rather than downloading full blobs. This innovation significantly reduces bandwidth requirements for validators, enabling more efficient processing of data blocks essential for rollups and Layer 2 solutions. According to Ethereum core developers, PeerDAS could expand blob capacity, supporting up to 150 million gas units per block compared to the current 30 million, as discussed in the ACDC #165 developer call. Experts from the Ethereum Foundation emphasize that this feature strengthens overall network security by minimizing full data exposure risks while maintaining high verification standards. Short implementation timelines ensure compatibility across nodes, with testing confirming no disruptions to existing operations.
Frequently Asked Questions
What Are the Key Features of the Ethereum Fusaka Upgrade?
The Ethereum Fusaka upgrade features EIP-7594 for PeerDAS, increasing the block gas limit to 150 million units to support more transactions, and expanding blob capacity for better Layer 2 scalability. It also adds new node security measures and includes about a dozen improvement proposals to enhance efficiency. Following an audit contest hosted on Sherlock platform with rewards up to $2 million, the upgrade ensures robust security before mainnet deployment, as confirmed by Ethereum Foundation announcements.
When Will the Ethereum Fusaka Upgrade Launch on Mainnet?
The Ethereum Fusaka upgrade is set to launch on mainnet around December 3, 2025, at least 30 days after its final Hoodi testnet activation. This timeline was established during core developer calls, building on successful tests on Holesky on October 1 and Sepolia on October 14. Ethereum Foundation officials, including co-executive director Tomasz K. Stanczak, have stressed coordinated efforts to meet this deadline without delays, focusing community resources on delivery.
Key Takeaways
- Final Testnet Success: Hoodi activation completes Ethereum Fusaka upgrade testing, confirming readiness for mainnet with no major issues reported.
- Scalability Enhancements: Features like expanded gas limits and PeerDAS will reduce costs and improve data handling for high-volume Layer 2 applications.
- Future Roadmap Focus: Post-Fusaka, Ethereum teams plan Glamsterdam for 2026, prioritizing faster block times and enshrined proposer-builder separation.
Conclusion
The Ethereum Fusaka upgrade represents a pivotal step in advancing the Ethereum Fusaka upgrade‘s core strengths in scalability and security, as evidenced by its successful Hoodi testnet deployment and comprehensive audit processes. With PeerDAS and increased blob capacity, the network is better equipped to support enterprise adoption and growing Layer 2 ecosystems. As mainnet activation approaches in December 2025, stakeholders should monitor developer updates closely, preparing nodes for seamless integration to capitalize on these efficiency gains in the evolving blockchain landscape.
