Ethereum Foundation Locks Glamsterdam Sepolia Fork to Epoch 353024

Epoch 353024 on Sepolia sets the activation point for the Glamsterdam upgrade at slot 11296768 on October 6 at 135336 UTC.

The Ethereum Foundation Protocol team published the Glamsterdam Testnet Announcement on September 28, 2026. Glamsterdam follows Fusaka and merges the Amsterdam execution-layer changes with the Gloas consensus-layer changes. This post focuses only on the Sepolia schedule while Hoodi and mainnet dates stay TBD.

Headliner EIPs driving the upgrade

EIP-7732 brings enshrined proposer-builder separation. Builders commit to blocks with a later payload reveal and a new payload timeliness committee. This structure aims to improve block production efficiency on the network.

EIP-7928 introduces block-level access lists. The change supports parallel state reads and validation while reducing state-root computation costs. Developers expect these lists to streamline how nodes process larger blocks over time.

Gas and state accounting updates

EIP-8037 raises the cost of state creation and meters it separately. EIP-8038 adjusts state-access costs. Additional revisions cover intrinsic gas, calldata pricing, access-list mechanics, and block-gas accounting. Applications that rely on fixed gas stipends or hardcoded limits may require updates before the fork lands on mainnet later.

EIP-7773 tracks all scheduled inclusions for Glamsterdam. The tracker lists EIPs 2780, 7688, 7708, 7732, 7778, 7843, 7928, 7954, 7976, 7981, 7997, 8024, 8037, 8038, 8045, 8061, 8246, and 8282 along with related networking changes.

Client upgrade requirements on Sepolia

Sepolia node operators and stakers must update both execution and consensus clients before activation. Consensus clients listed include Grandine 3.0.0-rc.0, Lighthouse 8.3.0-rc.0, Lodestar 1.49.0, Nimbus 26.10.0, Prysm 7.2.0, and Teku 26.9.1. Execution clients include Besu 26.9.0, Ethrex 28.0.0, Erigon 3.7.1, geth 1.17.7, Nethermind 2.1.0, and Reth 2.7.0.

Prysm and Teku default to a 60 million gas limit after the fork unless operators configure them for 200 million gas. Mainnet users and holders have no required actions from this Sepolia-only announcement.

Daily community monitoring cadence

Testnet forks like Glamsterdam keep the community focused on the upgrade timeline. Node operators check client releases daily while stakers verify their setups ahead of the epoch. A bug bounty remains active for Glamsterdam specifications and EIPs, giving researchers a direct channel to report issues.

The Ethereum Foundation blog post from September 28, 2026, supplies the full schedule and client tables. Community members track the countdown through official channels and coordinate upgrade windows in real time. This cadence repeats with each testnet milestone as the network prepares for larger changes.

The announcement keeps attention on Sepolia execution without projecting mainnet dates. Operators who complete the listed client upgrades position their nodes for the October 6 activation at the stated epoch and slot.