Core developers agreed on ACDE call #248 to pull the Glamsterdam activation on the Hoodi testnet, which had been scheduled for October 26 at epoch 132,352. The goal is to further investigate how EIP-8037 gas changes interact with existing mainnet smart contracts.

The rollback removes both the Amsterdam execution layer and Gloas consensus layer activations, plus a gas-limit schedule that would have lifted Hoodi's limit to 200M. Hoodi's chain history is not reverted, and the updated configuration contains no replacement epoch or timestamp.

Hoodi was the next test step before Glamsterdam reaches mainnet, and no mainnet date has been set.

Node and validator operators need to update execution and consensus clients before October 26. Besu 26.10.1, Nethermind 2.2.1 and Lodestar v1.50.1 already ship the revised config, while other clients will follow. No action is required from mainnet users or ETH holders.