Ethereum's Sepolia test network has activated the Glamsterdam upgrade, significantly increasing its block gas limit to nearly 200 million. This new limit is more than three times the 60 million gas limit currently enforced on Ethereum's mainnet.
Gas is the fundamental unit used to measure the amount of computational effort required to execute operations on the Ethereum network. The gas limit per block determines how much of this computational work can be included in a single block.
The 200 million gas limit was scheduled to go into effect at epoch 353,024, a specific marker in Ethereum's timeline. However, initial usage of this increased capacity has been modest. A review of 25 blocks on Etherscan between October 8 showed gas consumption ranging from approximately 24% to 43% of the new limit.
While a higher block limit does not automatically translate to three times the transaction throughput, it provides more headroom. This increased capacity can help mitigate transaction fee spikes during periods of high network activity by reducing congestion. However, larger blocks can pose challenges for validators, the entities that stake ETH to secure the network. Researchers from the Ethereum Foundation had previously expressed concerns that block limits exceeding 40 million might face propagation issues across the network, leading to a gradual increase in these limits over time.
Previous adjustments to the gas limit include a validator vote in February 2025 that raised it from 30 million to 32 million, followed by an increase to 60 million. The Fusaka upgrade on December 3, 2025, made this 60 million limit the default.
Ethereum's development roadmap includes other measures to enhance network scalability, such as block-level access lists, which allow for more efficient transaction verification, and enshrined proposer-builder separation, which aims to integrate the block assembly auction process into the protocol's core rules.
Glamsterdam represents a near-term step in Ethereum's evolution, with developers considering further gas limit increases toward 200 million. Sepolia, as a testnet, allows developers to test such changes without real financial risk. It previously served as a rehearsal ground for the Merge, Ethereum's transition to proof-of-stake.
No specific date has been set for the Hoodi testnet, nor has a mainnet upgrade been scheduled. Therefore, Ethereum's main network will continue to operate with its current 60 million gas limit.
