Ethereum said the Glamsterdam upgrade is scheduled for Hoodi on Oct. 26, with a 200M gas limit increase and no mainnet date yet.
Ethereum has scheduled its Glamsterdam network upgrade for the Hoodi testnet on Oct. 26, 2026, following the upgrade’s activation on Sepolia on Oct. 6, according to the Ethereum blog post published Oct. 16, 2026. The announcement matters because Glamsterdam is described as part of Ethereum’s L1 scaling roadmap, with changes aimed at improving block production, validation and gas accounting. The mainnet activation date has not yet been decided.
According to the announcement, Glamsterdam is set to activate on Hoodi at epoch 132,352, slot 4,235,264, which the post timestamps as Oct. 26, 2026 at 17:42:48 UTC. At the same epoch, Hoodi’s gas limit will be raised to 200M, matching Sepolia. The post also says node operators must update both execution and consensus layer clients before activation.
The announcement includes a deployment table showing Sepolia already activated on Oct. 6, while mainnet remains listed as TBD. It says Hoodi-compatible client versions will be added to the release tables as they are confirmed, and that only releases whose notes explicitly confirm support for the Hoodi Glamsterdam activation should be used.
Glamsterdam combines the Amsterdam execution layer upgrade with the Gloas consensus layer upgrade, and its headlining changes are enshrined proposer-builder separation, or ePBS, and block-level access lists, or BALs. The post says these changes are intended to support greater L1 throughput while keeping block validation practical for node operators.
Under EIP-7732, ePBS brings the separation between block proposers and builders into Ethereum’s consensus protocol.
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