Ethereum's Fusaka upgrade goes live on Sepolia ahead of December mainnet launch

The rollout marks the second phase of Ethereum’s three-step roadmap, testing higher gas limits and the new PeerDAS data-sampling system.

Ethereum’s Fusaka upgrade has been activated on the Sepolia testnet, marking the next major step in the network’s ongoing push to improve scalability and performance.

The upgrade marks the second phase of a three-step rollout under Ethereum’s Fusaka roadmap, following the Holesky testnet activation on Oct. 1. The Sepolia deployment focuses on stress testing the network’s new data-availability system and higher block gas limit before developers push the code to the final Hoodi testnet later this month.

Fusaka’s rollout is introducing a suite of performance and consensus improvements. The full upgrade aims to increase Ethereum’s block gas limit to 60 million, allowing blocks to process more transactions and complex smart-contract activity while testing whether nodes can maintain stability at higher capacity.

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