Prysm, one of Ethereum’s most widely used consensus clients, shipped a last-minute patch on Oct. 5 so validators can automatically propose blocks with a 200 million gas limit when the Glamsterdam upgrade’s Sepolia test activates. The Prysm v7.2.1 release adds the Sepolia gas-limit schedule, meaning operators need no manual configuration before the fork set for 13:53 UTC on Oct. 6.
The update closes a gap left by the previous version. Prysm v7.2.0, released on Sept. 28, scheduled the fork but did not include the gas-limit change, so validators running it would have kept producing blocks at Sepolia’s old 60 million gas default and diluted the capacity test. Version 7.2.1 defaults validators to 200 million gas automatically.
Why a 200 million gas limit matters
Gas measures how much computational work fits into a single Ethereum block. Raising Sepolia’s limit from roughly 60 million to 200 million gives the test network room for more than three times as much activity per block, including additional transactions, stablecoin transfers and complex applications before users begin competing for block space and fees climb. The trade-off is that larger blocks place heavier demands on the hardware running validators, which is exactly what the test is meant to measure.
What the Sepolia test is expected to show
Sepolia is where Ethereum developers rehearse changes using test tokens with no real value before anything reaches the main network. The earlier Platåberget test already gave developers a first look at the upgrade, and this run will show whether validators can consistently handle blocks more than three times larger than Sepolia’s previous default. Glamsterdam has not yet been scheduled for Ethereum’s mainnet, and developers will use the results to decide how much of that capacity the main network should adopt.
What happens next
The Sepolia fork activates at 13:53 UTC on Oct. 6, and validators on v7.2.1 will begin proposing 200 million gas blocks without any manual change. Beyond the gas-limit schedule, the patch also turns on partial data columns by default and reworks how builders are configured in the validator client. Ethereum’s main network is not yet scheduled for the upgrade, and the Sepolia results will shape how large a capacity increase developers ultimately roll out, a process that also runs through the foundation’s longer-term Layer 1 roadmap .
