Ethereum’s Glamsterdam Test Receives Last-Minute Fix Ahead of Capacity Boost

Ethereum developers have issued a last-minute software update ahead of a Sepolia test for the upcoming Glamsterdam upgrade, allowing the network to properly evaluate a major increase in block capacity.

Prysm, one of Ethereum’s primary validator clients, released version 7.2.1 late Monday, just hours before the scheduled test. The update automatically raises the maximum gas limit from the previous 60 million to 200 million when Glamsterdam activates on Sepolia.

Without the update, validators running the earlier Prysm version could have continued proposing blocks at the lower 60-million-gas limit. That would have weakened the test because the purpose of Tuesday’s trial is to measure how the network performs with substantially larger blocks.

Validators running Prysm 7.2.1 are expected to begin proposing blocks with a 200 million gas limit once Glamsterdam activates on Sepolia at approximately 13:53 UTC on October 6.

Glamsterdam Tests Ethereum’s Capacity

Glamsterdam is Ethereum’s next major upgrade and will first be tested on Sepolia, a public test network where developers can trial protocol changes using tokens that have no real-world value.

Tuesday’s experiment will increase Sepolia’s gas limit from roughly 60 million to 200 million. Gas measures the amount of computational work that can be included in an Ethereum block. Increasing the limit gives each block greater capacity for transactions and more computationally demanding operations, although it also increases the workload placed on validators.

Ethereum developers have been increasing block capacity gradually rather than making a single large jump. Each test helps determine how much additional workload validators can handle before operating the network becomes excessively demanding or costly.

A larger block capacity could eventually provide room for additional trading activity, stablecoin transfers and other applications without users having to compete as aggressively for limited block space. When block space becomes scarce, competition can push transaction fees higher.

Mainnet Deployment Is Still Ahead

The 200-million-gas limit is currently specific to the Sepolia test and does not apply to Ethereum’s mainnet. Glamsterdam itself has not yet been activated on the main network.

The October 6 test will give developers a clearer picture of whether validators can reliably process blocks more than three times larger than Sepolia’s previous default.

The results will help determine how much of the tested capacity can eventually be adopted for Ethereum’s main network. For now, the 200-million-gas setting remains an experimental benchmark rather than a confirmed mainnet configuration.