The Ethereum network has announced the final dates for the implementation of the major update Fusaka, which is set to take place on the mainnet on December 3, 2025. Developers expect this update to significantly impact the throughput and further scalability of the platform.
This is reported by Finway
Key Dates and Phases of the Fusaka Launch
The implementation of the Fusaka hard fork will occur in stages across several Ethereum test networks in October, with the final transition to the main network planned for early December. Testing will begin on Holesky on October 1, followed by Sepolia on October 14, then Hoodi on October 28, and the final phase will be activation on the mainnet on December 3.
“Important decisions were made during today’s Ethereum developers call, ACDC #165. Developers confirmed the schedule for the launch of public testnets and the BPO hard fork for Fusaka.”
Technical Changes and Future Development of Ethereum
The Fusaka update includes a phased increase in blob throughput. In the first week after activation, parameters will rise from 6/9 to 10/15, and in the second week to 14/21. This approach allows for a gradual increase in network load and ensures stable operation during the integration of new features.
Fusaka will be the next major hard fork following Pectra, which was successfully implemented on May 7, 2025, and included 11 protocol improvement proposals. Pectra is considered the largest update since the Merge.
To ensure the security of the upcoming release, the Ethereum Foundation announced a competition for auditors on the Sherlock platform on September 15, with a prize pool of $2 million. The main goal is to identify potential vulnerabilities in the Fusaka code before its release on the mainnet. The competition will last for four weeks.
At the same time, changes are ongoing in the Ethereum ecosystem at the level of test networks. At the beginning of September, the closure of Holesky was confirmed, with support set to be completely discontinued two weeks after the implementation of Fusaka. This decision was made due to technical difficulties encountered during the launch of Pectra.
Fusaka is expected, like previous hard forks, to contribute to the further scalability of the network and serve as a foundation for the next stages of Ethereum’s development, including the planned Glamsterdam update in 2026.