Ethereum delays Glamsterdam Hoodi upgrade over EIP-8037 review

Ethereum developers have postponed the planned Glamsterdam upgrade on the Hoodi testnet, removing the October 26 activation and leaving no replacement date in place, according to an Oct. 22, 2026 update from the Ethereum blog.

What changed on Hoodi

The update says core developers decided at ACDE #248 to delay the Hoodi fork so they could investigate interactions between EIP-8037 and mainnet smart contracts. The change removes the scheduled Amsterdam execution-layer activation and Gloas consensus-layer activation, along with the gas-limit schedule that would have increased Hoodi's gas limit to 200 million at the same epoch, the post said.

The blog said the postponement rolls back configuration for a future upgrade but does not revert Hoodi's chain history. It also said the October 26 activation at 17:42:48 UTC, epoch 132,352, is no longer scheduled and that a replacement activation epoch or timestamp has not been set.

Operator guidance and scope

For node and validator operators, the Ethereum blog advised checking both execution and consensus layer clients for instructions that reflect the postponed activation before October 26. It warned that software or custom network configurations still pointing to the old fork time need to be updated to match the revised Hoodi configuration. The post also said operators should follow their client teams' release notes rather than treating earlier release tables as confirmation that a version already includes the postponement.

The announcement listed new Hoodi client releases as they are confirmed, including consensus-layer versions such as Grandine, Lighthouse, Lodestar, Nimbus, Prysm and Teku, and execution-layer releases including Besu, Ethrex, Erigon, go-ethereum, Nethermind and Reth. It said builder and validator tooling guidance will be added when confirmed.

Why it matters

Glamsterdam combines Amsterdam and Gloas and is part of Ethereum's broader scaling roadmap. Background material supplied with the announcement says the upgrade includes EIP-7732, which introduces enshrined proposer-builder separation, and EIP-7928, which adds block-level access lists to support parallel state reads and transaction validation. The same background notes that Glamsterdam activated on Sepolia on Oct. 6, 2026, but the Hoodi delay does not set a mainnet activation date.

The post explicitly said no action is required from Ethereum mainnet users or ETH holders as a result of the Hoodi update. A revised Hoodi schedule will be announced separately, but the timing is unknown.