At the 221st Ethereum All Core Developers’ Meeting (ACDE), Galaxy Research VP Christine Kim laid out the rollout schedule for the Fusaka testnet upgrade, which is set to publicly activate on October 1. Meeting notes show that coordination remains ongoing: four client teams have not yet released their builds for next week’s testnet upgrade, establishing a clear timeline for client implementation and cross‑stakeholder testing.

Developers confirmed that once all testnet upgrades are complete, the Fusaka mainnet client will default to a 60 million gas block limit. That change is intended to align client behavior ahead of broader network adjustments while giving node operators and dapp teams time to prepare for higher throughput.

Separately, the EthPandaOps team plans to deploy a Holesky shadow fork tomorrow as a procedural validation step. The shadow fork will exercise client code paths in a controlled environment to surface potential issues before mainnet activation.

The sequence — client builds, Holesky shadow fork, and Fusaka public testnet activation — underscores the emphasis on rigorous testing and coordination across the Ethereum ecosystem.

Developers, validators, and DeFi teams should monitor client releases and run compatibility checks to ensure smooth adoption.