TL;DR
- Prysm v7.2.1 added Sepolia’s 200 million gas schedule hours before Ethereum’s Glamsterdam test, fixing a default that otherwise kept validators at 60 million gas.
- The Sepolia experiment will test whether validators and clients can reliably handle blocks with more than three times the previous gas capacity.
- Glamsterdam remains a testnet upgrade for now; Hoodi and mainnet dates are undecided, and 200 million gas is not a confirmed Ethereum mainnet setting.
Ethereum is entering its Sepolia Glamsterdam test with a last-minute Prysm fix ensuring validators propose 200 million-gas blocks. The Prysm v7.2.1 release added Sepolia’s GAS_LIMIT_SCHEDULE hours before the October 6 fork at epoch 353024. The previous release defaulted validators to 60 million gas unless operators configured 200 million manually. The update removes that configuration gap so Prysm validators can participate consistently in the capacity test.
Prysm Fix Aligns Validators With Sepolia’s 200M Gas Test
Prysm v7.2.1 sets the 200 million gas limit automatically from the Gloas fork, while operators can still override it through proposer settings or the keymanager API. The change follows earlier Glamsterdam capacity testing that pushed block capacity from 60 million toward 200 million gas. Without the fix or manual configuration, Prysm validators could have proposed smaller blocks and weakened Sepolia’s capacity experiment.
The release also fixes Gloas issues affecting the first post-fork block and historical state replay. Glamsterdam combines Amsterdam execution-layer changes with Gloas consensus changes, including enshrined proposer-builder separation and block-level access lists. Those features aim to support higher Layer 1 throughput while changing how blocks are built and validated, making the October 6 Sepolia deployment an important rehearsal for protocol changes.
Moving from 60 million to 200 million gas gives each block room for more computational work, potentially accommodating more transactions before block space becomes constrained. It also increases demands on validators and execution clients, explaining why developers are testing the setting outside mainnet. The 200 million figure is a Sepolia test parameter, not a confirmed mainnet gas limit, and results will help determine whether nodes handle larger blocks reliably.
Glamsterdam has already been tested on Platåberget, a public environment created to expose wallets, indexers and gas estimators to breaking changes. That phase warned developers against hardcoded maximum gas assumptions and gave applications time to adapt. Sepolia moves the upgrade into a longer-lived testnet where client interoperability and validator behavior face a more representative environment, building on Platåberget’s Glamsterdam rehearsal.
The 200 million gas schedule applies only to Sepolia. Hoodi and Ethereum mainnet activation dates remain undecided, leaving later deployments dependent on results. Prysm’s last-minute release fixes an immediate configuration problem rather than confirming Ethereum will adopt 200 million gas on mainnet, keeping Glamsterdam’s final capacity decision tied to evidence gathered during testing.
