Ethereum Fusaka upgrade is slated for December, according to the original report, and it targets major throughput gains for the network. Developers plan to scale Layer 2 capacity and push Ethereum toward higher transaction speeds.
PeerDAS and higher throughput
The Fusaka upgrade introduces Peer Data Availability Sampling (PeerDAS), which, according to the source, aims to help Ethereum theoretically process up to 12,000 transactions per second by 2026. As a result, Layer 2 throughput could see an eight-fold increase. This Ethereum Fusaka upgrade therefore focuses on data availability and scaling, not tokenomics.
Meanwhile, the change also increases the permissible smart contract code size from 24KB to 48KB. Developers can therefore deploy more complex logic within a single contract, which may simplify some architectures.
Blob capacity expands in two phases
Blob capacity will more than double through a two-step path of Blob Parameter Only (BPO) hard forks. The plan raises blobs from 6 to 15 per block around December 17 and then to 21 blobs by January 7, 2026. Consequently, data space for rollups should expand, supporting the Ethereum Fusaka upgrade objective of higher L2 throughput.
Additionally, the upgrade aims to raise the block gas limit from 30 million to 150 million units. If adopted by clients and validators, this could further improve execution capacity. However, final effects will depend on network conditions and implementation details.
What it means for users and builders
In practical terms, users could see faster and cheaper transactions on rollups as data space and sampling improve. Builders, meanwhile, get larger contracts and more headroom for scaling experiments.
- PeerDAS targets greater data availability.
- Two BPO forks expand blob counts.
- Gas and code size ceilings rise.
For context on data availability and rollups, see this primer from Binance Academy. To learn how value stays stable across layers, read our guide on how stablecoins work.
As always, timelines and impacts are subject to change as clients upgrade and the ecosystem tests these features. The Ethereum Fusaka upgrade remains focused on scaling without altering the asset’s monetary policy.
