After months of anticipation and behind-the-scenes development, Ethereum core contributors have finally set a date for the Fusaka upgrade.
Summary
- Ethereum’s Fusaka upgrade has been scheduled for Dec 3, 2025.
- Testnet upgrades on Holesky, Sepolia, and Hoodi will take place in October before the main rollout.
- The upgrade introduces major scalability changes, aimed at making the network more efficient.
- Two follow-on Blob Parameter Only upgrades will gradually raise blob capacity from 6 to 15, then 21 blobs per block, boosting data throughput for rollups.
Ethereum developers have officially confirmed that the Fusaka upgrade, the next major network update, will roll out on December 3, 2025. The announcement was made during the latest AllCoreDevs meeting, pushing the release back from the originally scheduled November timeline.
Fusaka is aimed at scaling Ethereum, particularly by improving data availability for Layer 2 (L2) networks, making the network faster and cheaper. Unlike previous forks like Pectra, which introduced visible user-facing features, Fusaka focuses on optimizations, bundling 11 Ethereum Improvement Proposals (EIPs) to enhance core protocol functionality.
Ethereum researcher Christine D. Kim confirmed that testnet upgrades on Holesky, Sepolia, and Hoodi will occur in October to prepare the network for Fusaka, with exact timing to be unveiled in the coming days.
To support the rollout, developers also scheduled two “blob parameter only” (BPO) upgrades to follow Fusaka. These BPO upgrades will lift the maximum number of “blobs,” special data packets that rollups use to store and share information cheaply, from the current 6 to 15 blobs per block in the first step and 21 blobs per block in the second.
The extra lead time will help catch any consensus bugs, allow node operators to upgrade without pressure, and
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Author: Grace Abidemi
