Ethereum's highly anticipated Fusaka upgrade is set to activate on December 3, 2025, representing a pivotal shift in the network's approach to scaling and efficiency. The upgrade centers on Ethereum Improvement Proposal (EIP)‑7594, Peer Data Availability Sampling (PeerDAS), which optimizes how nodes handle data from rollups by allowing validators to sample smaller pieces of data rather than downloading entire blobs. This reduces duplication and bandwidth usage, enabling higher data throughput without forcing node operators to upgrade to data-center hardware, thereby preserving decentralization.
The Ethereum Foundation has issued detailed preparation steps for developers, emphasizing that PeerDAS is expected to deliver up to an 8× increase in data throughput. Key technical changes include the introduction of EIP-7825, which enforces a per-transaction gas cap of 2^24, and support for secp256r1 passkeys via EIP-7951. Additionally, the gas limit will increase from 45 million to 60 million, with pre-planned blob capacity adjustments scheduled for December 9 (BPO1) and January 7 (BPO2) under a new "blob‑parameter‑only" upgrade schedule.
Chris Berry, head of onchain engineering at Bitwise Onchain Solutions, noted, "Ethereum is now trying to be more strategic in what it’s delivering and how quickly it’s delivering it." The upgrade also rebalances fees between layer 1 and layer 2 to ensure fair pricing, as highlighted by Steve Berryman, head of client partnerships at Bitwise, who said, "PeerDAS reduces that duplication of data" and observed that gas prices are currently at historic lows due to pre-fork activations.
Designed to remain accessible to home stakers, Fusaka has undergone extensive testnet runs to validate that increased capacity does not compromise consumer-grade hardware. The success metric, as Berry argued, will be measured by secure deployment and rising network utilization, with the upgrade aiming to foster a symbiotic relationship between L1 and L2 ecosystems for long-term scalability.
