Glamsterdam Hoodi Testnet Announcement
The Ethereum Foundation’s report details the upcoming Glamsterdam upgrade on the Hoodi testnet, slated for Oct 26 2026. It highlights new proposer‑builder separation, block‑level access lists and a gas‑limit jump to 200 M.
Points clés
- Glamsterdam introduces ePBS and BALs to boost L1 throughput.
- The Hoodi gas limit will rise from current levels to 200 M at activation.
- Node operators must update both execution and consensus clients before Oct 26 2026.
- Developers need to retest contracts against new gas‑pricing rules.
- Mainnet timing remains undecided; the testnet serves as a proving ground.
- Gas limit after upgrade
- 200M
- Activation epoch
- 132,352
- Activation slot
- 4,235,264
- Activation time (UTC)
- 17:42:48
What the upgrade aims to test
The Ethereum Foundation’s “Glamsterdam” upgrade is the next step in Ethereum’s L1 scaling roadmap, now targeted for the Hoodi testnet. The report asks whether the combined execution‑layer changes (Amsterdam) and consensus‑layer changes (Gloas) can safely deliver proposer‑builder separation (ePBS) and block‑level access lists (BALs) while handling a higher gas limit.
Data and methodology
The Foundation outlines a concrete activation schedule: epoch 132,352, slot 4,235,264 on Oct 26 2023 – 17:42:48 UTC (the date is listed as 2026). The plan includes a gas‑limit increase to 200 M, mirroring the Sepolia schedule. Node operators are required to run compatible client releases for both execution and consensus layers, and validators must adopt new duties for ePBS and the payload timeliness committee. The report also lists the full set of EIPs (EIP‑7732, EIP‑7928, EIP‑8037, etc.) that will be live at activation.
Main findings
According to the Foundation, the upgrade will let blocks be produced with separate proposer and builder roles, reducing reliance on trusted middleware and giving validators more time to validate execution payloads. Block‑level access lists enable parallel state reads, speeding up validation. Gas accounting is overhauled: EIP‑8037 raises state‑creation costs, while EIP‑8038 revises state‑access pricing, together delivering a more accurate reflection of execution and storage costs.
Caveats and open questions
The mainnet rollout has not been scheduled; the testnet serves as a sandbox for real‑world performance and bug‑hunting. The Foundation warns that contracts with hard‑coded gas limits or assumptions about remaining gas may need revisions. Moreover, builders and validator tooling must be updated to support the new ePBS duties, and the bug‑bounty program remains active for any specification gaps.
What it means for readers
For validators and node operators on Hoodi, the key action is to upgrade to the announced client versions before the Oct 26 deadline. Developers should test their contracts on Hoodi after activation, focusing on gas‑price changes and new opcodes. Mainnet users can stay tuned for a separate announcement, as no immediate action is required on the live network.