Ethereum’s core developers agreed to launch the Fusaka hard fork on December 3, introducing 12 Ethereum Improvement Proposals (EIPs). The upgrade will enable high levels of scalability and security, while minimizing expenses throughout the network.
Following the Fusaka upgrade, blob capacity will increase in two separate hard forks. The first and second expansions will take place on December 17 and January 7, 2026, respectively. Ethereum researcher Christine D. Kim verified that at least these changes will increase the present blob capacity more than twice.
Three testnets of the mainnet will be held between October and mid-November before the mainnet activation. According to developers, this gradual process will be stable and will give participants time to prepare for the transition.
The Fusaka plan adjusts blob targets and limits using several Blob Parameter Only (BPO) forks that do not require client-side updates. According to ethPandaOps, an Ethereum community group, the first conclusion is that we can proceed with a Maximum blob count of 15 with BPO1 and 21 with BPO2. Fusaka will have five BPOs in total, so we can safely guarantee mainnet scales by a significant margin.
Blobs assist in storing extensive data sets outside of the chain, thus making layer-2 networks more efficient and lowering the cost of transactions. Information given by Dune reveals that the average usage per block of the blobs has risen, whereas it was 0.9 in March 2023 and 5.1 since the Dencun upgrade in March 2024.
To enhance security and safeguard, the Ethereum Foundation declared a four-week code audit. It awarded 2 million dollars in tokens to developers who found bugs or defects in the Fusaka codebase.
Fusaka follows the Pectra upgrade from May, which lifted validator staking limits, introduced account abstraction, and improved layer-2 efficiency.
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Meanwhile, the Ethereum pullout line was at a record high. Approximately 2.6 million ETH, worth $12 billion, moved to the queue last week. In the meantime, the line to enter the staking pool has gone down to a four-week low, which raises concern that selling pressure will be evident when withdrawals are made.
Ethereum co-founder Vitalik Buterin explained the long checkout line by stating that reducing limits would undermine the chain's credibility. His comments were in response to Galaxy Digital Michael Marcantonio, who termed the long wait times problematic.