Ethereum developers released Prysm 7.2.1 just hours before the Glamsterdam upgrade is due to be tested on the Sepolia testnet, fixing a block gas limit configuration issue in the validator client so validators can automatically produce blocks with a 200 million gas limit.
Glamsterdam is Ethereum’s next major upgrade, and Sepolia will be the first network to run it. A central change in this round of testing is an increase in Sepolia’s block gas limit from about 60 million to 200 million.
Higher gas limit means larger block capacity
Gas is the unit used to measure how much computational work an Ethereum block can carry. Raising the gas limit means a single block can include more transactions and more complex onchain activity. It also increases the computing demands placed on machines running validator nodes.
Prysm is one of the main clients used by Ethereum validators. When its earlier version was released, Sepolia’s configuration did not yet include the 200 million gas setting. That meant validators still running the older version, without manually changing parameters, would continue producing blocks under the previous 60 million gas limit.
Prysm 7.2.1 includes the new 200 million gas setting
The 7.2.1 release, published by Prysm on Monday evening, includes the 200 million gas configuration by default. After upgrading, validators can automatically adopt the new block capacity once Glamsterdam is activated.
Under the test schedule, Glamsterdam will go live on Sepolia at 13:53:36 UTC on Oct. 6. Validators running the latest Prysm version will then automatically begin proposing blocks with a 200 million gas limit.
If some validators continue producing blocks under the old 60 million gas cap, that would weaken the test’s ability to evaluate how the network performs under larger block capacity.
Test focuses on validator stability at more than triple the prior default capacity
The main purpose of the test is to see whether Ethereum validators can stably process blocks that exceed the previous default capacity by more than three times. Ethereum has been gradually increasing block capacity and using tests to assess whether adding more block space would make validator operation too expensive or push hardware requirements too high.
If higher block capacity can run stably, Ethereum would gain more block space in the future, allowing more transactions, stablecoin transfers, and other onchain applications before competition for block space drives network fees higher.
The 200 million gas setting applies only to the Sepolia testnet for now. Glamsterdam has not yet been activated on Ethereum mainnet. Results from this test will help developers judge what block capacity may be appropriate for Ethereum mainnet going forward.