From Decrypt · By Jose Antonio Lanz
In brief
Ethereum's Sepolia testnet activated Glamsterdam on October 6 at epoch 353,024, with a block gas limit of nearly 200 million, more than three times mainnet's 60 million.
Sepolia blocks 11,872,013 through 11,872,037 used between 47.1 million and 85.9 million gas, roughly 24% to 43% of the limit.
The announcement sets no date for the Hoodi testnet and schedules no mainnet upgrade, so mainnet's limit stays at 60 million for now.
Ethereum's Sepolia test network activated the Glamsterdam upgrade on October 6 and began producing blocks with a gas limit of nearly 200 million, more than three times the 60 million that Ethereum's main network allows. Gas is the unit that measures computing work on Ethereum, and the gas limit caps how much of that work fits into a single block.
The 200 million figure was scheduled in a commit tied to epoch 353,024, a 6.4-minute time marker in Ethereum's calendar that began at 13:53:36 UTC.
Myriad: Where does Ethereum go next? Click to make your prediction.
Blocks used only a fraction of that room. A snapshot of 25 consecutive blocks on Etherscan taken on October 8, numbers 11,872,013 through 11,872,037, shows gas use at roughly 24% to 43% of the limit.
A higher ceiling does not mean three times as many transactions, only that a block can hold more when demand shows up. For everyday users, that headroom is what helps keep fees from spiking when many people use Ethereum at once, because congestion feels like strangers outbidding each other to get into the next block.
Bigger blocks are harder on validators, the computers that put up ETH as collateral to check and confirm each block. Ethereum Foundation researchers had warned that limits above 40 million could "fail to propagate as expected" across the network, so the number has crept up in small steps.
One of those steps was a 52%-to-48% validator vote in February 2025 that moved the limit from 30 million to 32 million. The limit was later raised to 60 million during 2025, double the original 30 million, and the Fusaka upgrade, which went live on December 3, 2025, made that the default.
BitcoinBTC · USD$81,757−3.4%Oct 1Oct 3Oct 5Oct 7Oct 8$86.8k$84.8k$82.8k$80.7k24h HighHigh$83,45924h LowLow$80,427VolVol$1.8BMarket projectionsOdds by MyriadTodayBelow $82,000Below $82k56% chanceThis weekBelow $82,000Below $82k53% chance→Buy Bitcoin with USDTPowered by JupiterPrice data by CoinGeckoCoinGeckoMore Bitcoin news and projections →Two changes on Ethereum's roadmap are meant to help the network handle more load. Block-level access lists record which accounts and data each block touches, so computers can check many transactions at once instead of one by one. Enshrined proposer-builder separation moves the auction that decides who assembles each block, today run through outside middleware, into Ethereum's own rules.