- The Ethereum network team confirmed the launch dates for the Fusaka hard fork.
- Testnets will start in October, and the update will be launched on the main network on December 3.
- It is expected that Fusaka will change Ethereum through a gradual increase in blob capacity.
Ethereum developers confirmed the launch dates for the Fusaka upgrade. It is planned to activate it on the main network on December 3, 2025, after a series of deployments on test networks. Analyst Kristin Kim reported this after the weekly call of All Core Developers Consensus (ACDC) 165.
"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."
According to the plan, the deployment of the Fusaka upgrade will take place as follows:
- Holesky - October 1;
- Sepolia - October 14;
- Hoodi - October 28;
- mainnet - December 3.
It was separately confirmed that blob capacity after the activation of Fusaka will increase in two stages:
- in the first week - from 6/9 to 10/15;
- in the second - until 14/21.
Fusaka will be the next major hard fork of Ethereum after Pectra, which was successfully activated on May 7, 2025. Pectra contained 11 improvement proposals (EIP), and its deployment was called the largest since the Merge.
The Ethereum Foundation is also actively preparing for the release of Fusaka. On September 15, the organization announced an auditor competition on the Sherlock platform with a prize pool of $2 million. Its goal is to identify vulnerabilities in the code before the main release. The competition will last four weeks.
At the same time, changes are taking place in the network at the level of testnet infrastructure. In early September, the Ethereum Foundation reminded about the closure of Holesky, which will be discontinued two weeks after the installation of Fusaka. This decision was made after technical difficulties during the deployment of Pectra.
It is expected that Fusaka, like previous hard forks, will make the network more scalable, and the gradual increase in blob capacity will serve as a basis for further updates, including Glamsterdam, which has already been announced for 2026.