Ethereum’s Sepolia testnet activated the Glamsterdam upgrade on October 6 at epoch 353,024, increasing its block gas limit to nearly 200 million—more than three times the main network’s 60 million gas cap. The change was implemented at 13:53:36 UTC and marked a major technical trial for the Ethereum ecosystem.
Glamsterdam upgrade details
The higher gas limit enables each block to potentially handle much more computational work than before, allowing for greater throughput in times of network congestion. However, block activity since the upgrade shows that this new ceiling is largely unfilled. An Etherscan snapshot of 25 consecutive blocks—numbers 11,872,013 through 11,872,037—revealed actual gas usage between 47.1 million and 85.9 million per block, or approximately 24% to 43% of the maximum allowed.
Despite the substantial increase, not all that capacity is actively used. Higher ceilings provide flexibility when transaction demand rises, but the network only benefits from lower congestion if blocks are filled closer to their limit. This adjustment aims to help mitigate fee spikes during peak periods.
Past and future adjustments
Ethereum’s gas limit has risen gradually. A validator vote in February 2025 narrowly approved moving from 30 million to 32 million, with the ceiling subsequently reaching 60 million in 2025. The Fusaka upgrade set this figure as the default after going live in December 2025. Ethereum researchers have previously cautioned that network propagation issues could occur above a 40 million gas limit, so increases have typically been conservative.
The Foundation outlined two major roadmap changes to prepare for future scaling. Block-level access lists will record which accounts and data each block references, allowing nodes to batch-verify transactions. Meanwhile, enshrined proposer-builder separation will move the process that selects who assembles each block directly onto the protocol, reducing reliance on external middleware.
Ethereum co-founder Vitalik Buterin described in July a broader shift that could overhaul most of the protocol over the next several years, with Glamsterdam seen as a landmark step and potential precursor to a further gas-limit increase approaching 200 million.
No mainnet gas limit change for now
Sepolia functions as a non-financial test network, allowing developers to experiment on live infrastructure without risking real assets. It previously hosted the Merge rehearsal in July 2022, ahead of Ethereum’s mainnet switch to proof of stake.
Currently, no official date is set for Hoodi, the next public testnet. The main Ethereum network retains its 60 million gas limit, with no planned upgrade scheduled.
While these developments demonstrate ongoing efforts to raise network capacity, Ethereum’s developers remain cautious in scaling up the mainnet’s computational limits. Continuous monitoring and testing are expected before moving forward with upgrades beyond the test environment.
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A higher ceiling does not guarantee a proportional increase in transactions. Instead, it ensures the network can accommodate traffic spikes, stabilize user fees, and prepare for anticipated protocol upgrades.
