12-9-2025 – Ethereum’s core developers have proposed a new timeline for the Fusaka upgrade, aiming for a potential mainnet launch by November 2025, according to a summary of the 220th Ethereum Execution Layer Core Developers Meeting by Christine Kim, Vice President of Research at Galaxy. The upgrade, designed to enhance Ethereum’s scalability and efficiency, marks a critical step in the blockchain’s evolution following the Pectra upgrade.
The meeting highlighted progress on Fusaka Devnet-3, where developers completed a second round of non-finality testing. However, unresolved technical issues and defects were noted, requiring further refinement. Developers are now preparing for Devnet-5, where they will analyze a blob parameter-only (BPO) hard fork. This focused approach aims to optimize blob data handling, a key feature for improving Layer 2 transaction throughput and reducing costs for validators.
Fusaka’s advancements, including PeerDAS and potential gas limit increases, build on Ethereum’s prior upgrades like Dencun and Pectra, which improved staking and cost efficiency. The proposed timeline reflects optimism but hinges on resolving current technical challenges to ensure network stability. Developers will provide updates on Devnet-5 testing and client readiness in upcoming meetings, with the community closely watching for confirmation of the November target.
