Ethereum developers have made a last-minute change to validator software ahead of a major Glamsterdam capacity experiment on Sepolia. The update is intended to ensure the test measures the network at its planned 200 million gas limit rather than the previous lower setting.
Prysm, one of the major client implementations used by Ethereum validators, released version 7.2.1 late Monday. The software is configured to automatically increase the maximum gas limit per block to 200 million when Glamsterdam activates on Sepolia, compared with the 60 million limit used by the earlier version.
That adjustment matters because validators that had remained on the previous release could have continued proposing blocks at 60 million gas. Such blocks would have reduced the value of a test designed specifically to examine how Ethereum handles significantly larger blocks.
When Glamsterdam activates on Sepolia at approximately 13:53 UTC on October 6, validators running the updated Prysm software are expected to begin proposing blocks with the 200 million gas limit automatically.
Testing a Major Increase in Block Capacity
Glamsterdam is Ethereum’s next major network upgrade and is being introduced first on Sepolia, where developers can test protocol changes using assets that have no real monetary value.
The scheduled experiment will move Sepolia’s gas limit from roughly 60 million to 200 million, representing more than a threefold increase.
Ethereum uses gas to quantify the computational work required for transactions and other network operations. A higher block gas limit allows more transactions or more complex computations to fit into each block. At the same time, larger blocks increase the processing, storage and propagation demands placed on validators.
Ethereum developers have been approaching higher capacity gradually, using test networks to identify the point at which larger blocks could become too demanding or expensive for validators to operate reliably.
If the higher capacity proves sustainable, additional block space could eventually accommodate more trading, stablecoin transfers and other on-chain applications. It could also reduce competition for block space during periods of high activity, potentially limiting fee pressure.
Mainnet Capacity Remains Unchanged
The 200 million gas setting is currently limited to the Sepolia experiment. It has not been adopted by Ethereum’s mainnet, and Glamsterdam has not yet activated on the production network.
The October 6 trial is intended to provide evidence on whether validators can reliably process blocks more than three times the size of Sepolia’s previous default.
Developers will use the results to determine how much of the tested capacity, if any, should eventually be introduced to Ethereum mainnet. For now, the 200 million gas figure represents an experimental target rather than a confirmed mainnet limit.
