Ethereum Fusaka Upgrade: What It Means for ETH Price

Ethereum’s next major upgrade, called Fusaka, is scheduled for December 3, 2025, and it could play a central role in lowering scaling costs and supporting ETH’s bullish momentum.

Developers confirmed the timeline after successful testnet deployments on Holesky, Sepolia, and Hoodi earlier this fall.

What’s Inside the Ethereum Fusaka Upgrade?

The upgrade brings about PeerDAS (EIP-7594), which enables the nodes to verify only portions of blob data rather than downloading the entire content. The network is more efficient with this change, and the ground is laid out to do full danksharding in the future. Together with PeerDAS, developers will release two Blob Parameter Only (BPO) forks. These modifications add progressively more capacity to blobs without necessitating new client software.  BPO-1 will increase the target of the blob, which was 6/9 to 10/15, one week after Fusaka activates. BPO-2 will increase it to 14/21 a week later, which is over twice the capacity.

Blobs, brought with the Dencun upgrade, reduce the expense of submitting data to the layer-2 (L2) networks. The usage of blobs has since been intense, with a robust demand being evident among rollups such as Arbitrum and Unichain. 

In the case of Ethereum, reduced L2 prices would imply greater on-chain utilization. This is a standard feedback into ETH demand, as gas charges and staking rewards are usage-dependent.

In the medium term, the increased data capacity should enhance the role played by Ethereum as the settlement layer of decentralized finance.

The upgrade arrives at a time when ETH is trading in a bullish setup, with analysts pointing toward the $6,000 range by October if momentum holds. 

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How Could the Fusaka Upgrade Impact Ethereum’s Role in DeFi?

Ethereum developers have confirmed the public testnet timeline and the schedule for upcoming Blob Parameter Only (BPO) forks, according to researcher Christine D. Kim, who shared the update on X after the latest All Core Devs Consensus (ACDC) call.

Important decisions were made on today's Ethereum developer call, ACDC #165. Developers confirmed the public testnet schedule and BPO hard fork schedule for Fusaka.

Let's get into it. pic.twitter.com/mNrYMYyDj2

— Christine D. Kim (@christine_dkim) September 18, 2025

Two new charts offer insight into how the network is being used ahead of the Fusaka upgrade, set for December 3.

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