Ethereum developers have successfully launched the Fusaka upgrade on the Sepolia testnet, following a previous trial on the Holesky testnet. This marks a significant step in the upgrade process, with a final rehearsal scheduled for the Hoodi testnet on October 28th. The Fusaka upgrade introduces PeerDAS, a data verification method designed to reduce bandwidth requirements and lower costs for institutional users and Layer 2 networks by allowing validators to process only a portion of the data. The successful deployment on Sepolia brings developers closer to finalizing the mainnet activation date.