Ethereum core developers have set a tentative date of December 3 for the Fusaka upgrade to launch on the mainnet, following a series of testnet activations on Holesky (Oct. 1), Sepolia (Oct. 14), and Hoodi (Oct. 28). The schedule was announced during the latest ACDC #165 developer call, with final confirmations of timing and epoch numbers expected soon. Developers also anticipate blob capacity on the network to double within two weeks of the upgrade.

Fusaka is Ethereum’s next major hard fork, designed to advance scalability without compromising decentralization or security. Its key feature, Peer Data Availability Sampling, will allow validators to confirm large datasets, or “blobs,” by sampling smaller portions from peers instead of downloading full datasets.

The upgrade also proposes raising the block gas limit from 30 million to 150 million, enabling more transactions per block, while integrating Verkle Trees for more efficient data storage and smaller proof sizes. Performance improvements to the Ethereum Virtual Machine (EVM) are also part of the package, aimed at speeding up smart contract execution.

To ensure security ahead of the mainnet rollout, the Ethereum Foundation has launched a four-week audit contest offering up to $2 million in rewards for researchers who identify vulnerabilities. Looking ahead, Ethereum’s following major upgrade, Glamsterdam, is expected in 2026, with a focus on further scalability improvements, including the full rollout of the EVM Object Format (EOF) and potentially faster block times.