Ethereum’s Fusaka upgrade, targeting a November 2025 mainnet fork, may be delayed by four weeks after client teams raised concerns over an aggressive September 1 deadline to finalize release candidates.
Lodestar’s Matthew Keil proposed moving the release-cut date to late September to allow more time for merging large feature branches and conducting stability testing. Prysm’s Manu Nalepa supported this, emphasizing critical testing on private mempool behavior and non-finality events where validators pause block finalization.
Fusaka aims to improve Ethereum’s data availability through PeerDAS, increase maximum blob limits from six to nine per block, reduce the target blob count for smoother gas prices, and introduce new opcodes and precompiles to boost Ethereum Virtual Machine efficiency.
The delay would help prevent last-minute bugs and ensure a smooth upgrade rollout by allowing thorough testing of the final code.
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