Ethereum's Glamsterdam Upgrade Hits Sepolia With a 200M Gas Limit — and Barely Fills a Block

Ethereum just finished its biggest rehearsal of the year. On October 6, the Glamsterdam upgrade went live on Sepolia — a testnet where the tokens are worth nothing — and pushed the per-block gas limit from roughly 60 million to nearly 200 million.

That is more than triple the room. For anyone who has watched a hyped mint eat the chain alive, that number is the whole story: more block space could eventually mean more trades landing before fees start fighting each other.

What Glamsterdam changes

Two features do the heavy lifting. Enshrined proposer-builder separation, or EIP-7732, moves the split between block proposers and builders into Ethereum's consensus protocol instead of leaning on outside middleware, and it separates consensus validation from execution validation so validators get more time to check payloads.

Block-level access lists, EIP-7928, are the other half. They record the accounts and storage slots a block touched, plus the state changes that followed, letting clients read and validate transactions in parallel.

There is a repricing too. Creating state gets more expensive and separately metered under EIP-8037, while EIP-8038 updates state-access costs. Contracts that assume fixed gas stipends may need edits.

The test was not actually full

Here is the honest part — Sepolia did not come close to maxing out. More than 25 consecutive blocks used between 52 million and 92 million gas, or 26% to 46% of the new ceiling, and none pushed toward 200 million.

Developers also had to scramble. A last-minute Prysm release, version 7.2.1, shipped hours before activation so validators would produce 200M-gas blocks automatically; without it they would have stayed at 60 million and quietly ruined the experiment.

The numbers that did land were clean. Across a six-minute voting window, all 32 scheduled blocks were proposed and 99.97% of eligible testnet stake voted toward finality.

Why this matters

None of it touches mainnet yet. Glamsterdam has no activation date on Ethereum itself and no production gas limit has been set, with Hoodi only tentatively penciled in for October 27.

Treat this as a signal, not a switch. Ethereum is testing whether validators can handle blocks three times larger without the network creaking. If it works, cheaper blocks decide whether airdrop farmers keep their gains or hand them back in gas. If it does not, Hegotá is already queued up behind Glamsterdam.