Ethereum
Ethereum Glamsterdam Upgrade Scheduled for Sepolia Testnet on October 6
Ethereum developers plan to launch the Glamsterdam upgrade on the Sepolia testnet on October 6, 2026, ahead of any mainnet deployment.
The Ethereum Glamsterdam upgrade is scheduled to activate on the Sepolia testnet on October 6, 2026, rather than on the Ethereum mainnet. Because Sepolia is an isolated testing network where assets have no monetary value, the transition requires no action, wallet modifications, or token swaps from regular ETH holders on exchanges or private wallets.
Testnets like Sepolia serve to trial protocol modifications under real operating conditions prior to a wider release. The Ethereum Foundation has specified that node operators on Sepolia must update both their execution and consensus clients ahead of the activation. The planned date follows an earlier target of September 28 that passed before implementation.
A calendar date for the mainnet activation remains unconfirmed. Official Ethereum Foundation documentation notes that the upgrade is currently undergoing devnet testing, with an estimated mainnet window in the fourth quarter of 2026. Further steps, including testing on the validator-focused Hoodi testnet, have yet to receive scheduled dates.
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