Ethereum (ETH) developers will switch on the Glamsterdam upgrade on the Hoodi testnet Oct. 26, lifting the testnet's gas limit to 200 million while mainnet timing stays undecided.
Key Points:
- Glamsterdam goes live on Hoodi at 17:42:48 UTC on Oct. 26, 20 days after its Sepolia debut.
- Hoodi's gas limit will jump from 60 million to 200 million at the same epoch.
- Developers have not set a mainnet date, and ordinary ETH holders need not act.
Ethereum Glamsterdam Hoodi Date
The Ethereum Foundation said in an Oct. 16 announcement that the fork will activate at Hoodi epoch 132,352, slot 4,235,264, at 17:42:48 UTC. The upgrade went live on the Sepolia testnet Oct. 6.
Client teams will use the Hoodi run to test software and network behavior before they choose a date for the main chain.
Hoodi's gas limit will climb from 60 million to 200 million at the fork epoch, about 3.3 times its former level and in line with the setting already used on Sepolia. That is a test setting, not a mainnet commitment.
Node operators and validators on Hoodi need updated execution and consensus clients before activation, since a node running the old rules cannot follow the upgraded chain. During the Sepolia fork, some validator clients defaulted to a 60 million gas target, so operators had to change the setting by hand to propose 200 million gas blocks. Mainnet ETH holders have nothing to do yet.
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Toni Wahrstätter's View
Ethereum researcher Toni Wahrstätter wrote in a post that Hoodi is the final testnet before mainnet, adding that "300M feels like a realistic next step" once the 200 million limit is in place. That figure is not a confirmed Glamsterdam setting.
Glamsterdam rests on two core changes. Enshrined proposer-builder separation, or ePBS, moves the handoff between block proposers and builders into Ethereum's protocol and reduces reliance on trusted middlemen. Block-level access lists record the accounts and storage a block touches, letting clients read state and validate transactions in parallel.
Glamsterdam Gas Repricing
The upgrade also raises the cost of creating state, and replays of past mainnet transactions flagged a small group of contracts whose gas assumptions may break. A higher ceiling alone doesn't guarantee faster confirmations or lower fees.
The Plataberget testnet went live on Aug. 13, giving developers an early place to test Glamsterdam's gas model. Days later, the foundation's Protocol DevOps team warned that any tool relying on a hardcoded maximum gas limit "will break" and must be updated. Sepolia followed on Oct. 6, and Hoodi is next in line.
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