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.

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 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.

EIP-8037 introduces a state-gas reservoir, creating a separate gas budget specifically for state-creation costs that operates independently of standard execution gas.

The postponement of the Glamsterdam upgrade was agreed upon during the October 22, 2026, All Core Developers Execution meeting #248.

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

The Hoodi testnet postponement cancels the planned increase in Hoodi's gas limit to 200 million.

Under EIP-8037, gas restored during execution allows contracts designed around older rules to complete failure-handling instructions instead of cleanly reverting.

EIP-8038 modifies the gas costs associated with accessing and modifying existing blockchain state.

Lodestar released consensus client v1.50.1 and Besu released execution client 26.10.1 on October 22, 2026, to unschedule Glamsterdam on Hoodi.

Following the Hoodi testnet postponement, Sepolia is the only remaining active testnet where the Glamsterdam upgrade is currently running.

Ethereum core developers cancelled the Glamsterdam network upgrade after identifying an application-layer gas vulnerability

Ethereum researcher Toni Wahrstätter suggested a 300 million gas limit could be a realistic next step after Ethereum's 200 million gas limit target

Mainnet activation timing for Ethereum's Glamsterdam upgrade will be announced once decided by client teams following post-testnet reviews

The Ethereum Foundation said the Hoodi testnet gas limit will increase from 60 million to 200 million at epoch 132,352 during the October 26, 2026 Glamsterdam activation