Ethereum developers pushed out a last-minute Prysm update ahead of Tuesday’s Glamsterdam test on the Sepolia testnet, fixing a setting that could otherwise have left part of the validator set producing much smaller blocks than planned.
One of the main goals of the Sepolia rehearsal is to raise the block gas limit from about 60 million to 200 million. In Ethereum, gas measures how much computational work can fit into a block. A higher limit gives the network room to process more transactions and more complex activity at the same time, but it also increases the burden on the machines running validators.
Prysm 7.2.1 adds the 200 million gas setting
According to CoinDesk, Prysm, one of Ethereum’s main validator clients, released version 7.2.1 late Monday with the 200 million gas parameter built in.
The previous release had been completed before Sepolia’s new configuration was added. That meant validators still running the older version would have kept proposing blocks at the prior 60 million gas limit unless operators changed the value manually.
Developers issued the update shortly before the test so validators on the latest version would automatically begin proposing 200 million-gas blocks once Glamsterdam goes live on Sepolia. Without that change, smaller blocks would have diluted the results of the capacity trial.
Sepolia is the first stop for Glamsterdam
Glamsterdam is Ethereum’s next major upgrade, and Sepolia is the first network where it will activate. Sepolia is a testnet, where protocol changes are rehearsed with tokens that have no real-world value.
CoinDesk reported that Glamsterdam is scheduled to activate on Sepolia at 13:53:36 UTC on Oct. 6. Validators running the latest Prysm release are expected to start proposing 200 million-gas blocks automatically at that point.
If some validators were to continue proposing blocks under the old limit, the exercise would no longer reflect the full stress test developers are trying to run.
Developers are measuring how much larger blocks Ethereum can support
Ethereum has been increasing block capacity in stages, testing how far it can go before running a validator becomes too demanding or too expensive.
This Sepolia test is designed to show whether validators can consistently handle blocks that are more than three times larger than the testnet’s previous default. The result is expected to inform how much of that capacity is appropriate for Ethereum’s main network.
More block space could eventually leave room for more trades, stablecoin transfers and other applications before users begin competing more intensely for limited capacity and pushing fees higher.
The 200 million gas limit does not yet apply to mainnet
For now, the 200 million gas setting applies only to Sepolia. Glamsterdam has not yet been activated on Ethereum’s mainnet.
Tuesday’s rehearsal is meant to answer a narrower question first: whether validators can handle this larger block size reliably and repeatedly. Only after that will developers decide what level of capacity fits Ethereum itself.