Ethereum target December for Fusaka upgrade launch as $2M bug bounty heats up
Ethereum’s core builders have mapped out a launch window for the long-anticipated Fusaka upgrade, with mainnet activation penciled in for Dec. 3.
The draft schedule, shared in the course of the Sept. 17 All Core Developers’ Call (ACDC), nonetheless requires remaining affirmation, nevertheless it alerts rising momentum toward one of Ethereum’s most important technical overhauls.
The rollout will start on take a look at networks in phases. Holesky is ready to upgrade on Oct. 1, adopted by Sepolia on Oct. 14 and Hoodi on Oct. 28. Provided these rehearsals run easily, the modifications shall be able to migrate onto Ethereum’s foremost community in December.
Phased Blob forks
Christine Kim, former analysis vp at Galaxy Digital, emphasized that the community builders will proceed refining dates, epochs, and timing over the approaching weeks.
She added:
“They additionally agreed that based mostly on some preliminary evaluation on Fusaka Devnet-5, blob capability ought to greater than double over the 2 weeks following Fusaka activation.”
Blobs, launched by EIP-4844, are short-term on-chain knowledge containers that enable Layer 2 rollups to publish transaction knowledge to Ethereum at a decrease price. Unlike everlasting name knowledge, blobs expire after roughly two weeks, serving to to scale back storage calls for whereas sustaining knowledge integrity.
This mechanism is designed to decrease prices for rollups and enhance Ethereum’s scalability.
To decrease dangers, Ethereum builders agreed to progressively roll out through Blob Parameter Only (BPO) forks. So, as a substitute of elevating blob capability in a single step, thresholds shall be elevated in phases.
As a consequence, the primary BPO fork, anticipated Dec. 17, will increase blob targets from 6/9 to 10/15. A second fork on Jan. 7, 2026, will push these limits to 14/21.
Meanwhile, Fusaka’s impending rollout was introduced simply days after the Ethereum Foundation launched a $2 million security contest. The initiative, hosted on the Sherlock testnet from Sept. 15 to Oct. 13, incentivizes researchers to determine vulnerabilities within the upgrade.
To encourage early participation, findings submitted within the first week earn double factors, whereas submissions within the second week qualify for a 1.5x multiplier.
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