Ethereum developers postponed the Glamsterdam upgrade on the Hoodi testnet after security researchers identified gas-accounting risks affecting smart contracts.

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The Ethereum Foundation delayed deployment of the Glamsterdam hard fork on the Hoodi testnet because of security concerns that EIP-8037 could weaken defenses in existing mainnet contracts

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EIP-8038 aims to increase Ethereum's transaction capacity by aligning gas charges more closely with the resources smart contracts consume.

The Hoodi testnet postponement also suspends the planned activations of both the Amsterdam execution layer and the Gloas consensus layer on the network.

The Glamsterdam upgrade successfully activated on the Sepolia testnet on October 6, 2026, running with a gas limit of approximately 200 million.

The Ethereum Foundation announced on October 22, 2026, that the Glamsterdam upgrade scheduled for October 26, 2026, on Hoodi would no longer proceed.

The Ethereum Foundation has not announced a replacement activation date for Hoodi or confirmed a mainnet deployment schedule for Glamsterdam.

ChainSecurity disclosed on October 22, 2026, that it had identified 13 real-world deployed mainnet contracts vulnerable to gas-accounting changes under Glamsterdam.

EIP-8037's state-gas reservoir passes to child calls without being subject to the EIP-150 rule that caps forwarded execution gas at 63/64.

ChainSecurity stated it is conducting responsible disclosure with the 13 affected projects while declining to publicly identify specific contracts.

ChainSecurity calculated that creating a new storage slot under proposed Glamsterdam rules could require up to 110,020 gas when state allowance is exhausted.

Prior to the Hoodi postponement, Ethereum developers were considering December 1, December 8, and December 9, 2026, as potential mainnet activation dates.