Ethereum (ETH) developers will activate the Glamsterdam upgrade on the Hoodi testnet on October 26. Alongside this, the Hoodi testnet’s gas limit will be significantly increased to 200 million, while the timing of its mainnet deployment remains undecided.
Key points
Glamsterdam will go live on Hoodi on October 26 at 17:42:48 UTC, 20 days after its deployment on Sepolia on September 6.
At the same time, Hoodi’s gas limit will be increased from 60 million to 200 million.
The mainnet fork date has not yet been finalized, and ordinary ETH holders do not need to do anything right now.
Ethereum Glamsterdam: Hoodi schedule
The **Ethereum Foundation** announced on October 16 that the Glamsterdam hard fork will activate at 17:42:48 UTC, at Hoodi epoch 132,352, slot 4,235,264. The upgrade was already deployed on the Sepolia testnet on October 6.
Client teams plan to check the software and network behavior on Hoodi before making a final decision on the mainnet deployment date.
Hoodi’s gas limit will increase from 60 million to 200 million at the time of the fork. That is about 3.3 times the current limit and matches the value already in use on Sepolia. This is strictly a testnet setting, not a commitment to apply the same figure on mainnet.
Hoodi node operators and validators must upgrade both their execution and consensus clients to the latest versions before the fork. Nodes running the old rules will not be able to follow the upgraded chain. During the Sepolia fork, some validator clients kept the default gas target at 60 million, so operators had to change their settings manually to propose 200-million-gas blocks. Mainnet ETH holders, on the other hand, do not need to take any action at this time.
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Toni Wahrstätter’s perspective
Ethereum researcher **Toni Wahrstätter** noted in an X post that Hoodi is the final testnet before mainnet, and said that once the gas limit settles at 200 million, “300 million seems like a realistic next step.” However, 300 million gas is not an officially specified figure for the Glamsterdam upgrade.
Glamsterdam includes two key changes. First, it introduces Enshrined Proposer-Builder Separation (ePBS) explicitly at the protocol level, bringing the division of roles between block proposers and builders into the Ethereum protocol itself. The goal is to reduce reliance on trusted intermediaries such as relays. It also introduces block-level access lists, which explicitly record the accounts and storage information referenced by each block, allowing clients to read state and validate transactions in parallel.
Glamsterdam and gas cost adjustments
This upgrade also increases the cost of creating new state. Replaying past mainnet transactions revealed that gas assumptions may break for some smart contracts. Simply raising the gas limit will not make processing faster or automatically lower fees.
Developers first tested Glamsterdam’s gas model on the Plataberget testnet, launched on August 13. Just a few days later, the Foundation’s Protocol DevOps team warned in an announcement that tools with hard-coded maximum gas limits “will malfunction if left unchanged” and must be updated. Sepolia followed on October 6, and Hoodi will now be the third testnet stage.
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