Ethereum’s Glamsterdam test gets last-minute fix before major capacity jump
Updated Oct 6, 2026, 1:51 a.m. EDTPublished Oct 6, 2026, 12:49 a.m. EDT
2 min read
Summary
- Ethereum developers released a last-minute Prysm update to ensure validators automatically produce blocks with a 200 million gas limit during the Glamsterdam upgrade’s Sepolia test.
- Without the update or a manual configuration change, some validators would have continued producing blocks at Sepolia’s previous 60 million gas limit, undermining the capacity test.
- The test will assess whether validators can reliably handle blocks more than three times larger before developers determine an appropriate capacity for Ethereum’s main network.
Ethereum developers have pushed out a last-minute software update to ensure that Tuesday's experimental trial run of the upcoming "Glamsterdam" upgrade can properly test a massive network capacity increase.
The urgent update was released late Monday by Prysm, a popular software program used to run the network. This new version (7.2.1), released late Monday, automatically scales the network's maximum computing power per block or transaction processing capacity up to a 200-million gas limit, up from the earlier version that capped it at 60-million gas.
Had it stayed that way, it would have diluted the test run specifically designed to see how the network copes with larger block sizes. In other words, blocks proposed at the old limit would have diluted the test, which is meant to show how the network copes with the larger size.
Validators on the latest version will start proposing 200 million-gas blocks automatically when Glamsterdam activates on Sepolia at around 13:53 UTC on Oct. 6.
Glamsterdam is Ethereum's next major upgrade, and it activates first on Sepolia, a test network where developers rehearse changes using tokens with no real value. A Tuesday's test raises Sepolia's gas limit from about 60 million to 200 million.
Gas is the unit Ethereum uses to measure how much computing work fits into a block. A higher limit gives the network room to process more transactions and more complex activity at once, though it also asks more of the computers that run Ethereum.
Read More: Ethereum’s upcoming Glamsterdam upgrade clears rehearsal for a big jump in capacity
Ethereum has been raising block capacity in steps, testing how far it can go before running a validator becomes too demanding or expensive. More block space can eventually mean room for more trades, stablecoin transfers and other applications before users start competing for space and pushing fees higher.
The 200 million setting applies only to Sepolia, and Glamsterdam has not yet activated on Ethereum's main network.
Tuesday's test will show whether validators can consistently handle blocks more than three times Sepolia's previous default before developers decide how much of that capacity suits Ethereum itself.
Read More: Ethereum developers warn ‘any teenager’ could disrupt upcoming Glamsterdam test
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The Definitive Stablecoin Landscape Series: Asia Pacific
The Definitive Stablecoin Landscape Series: Asia Pacific
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Why it matters:
As stablecoins move into regulated finance, APAC is becoming a key proving ground. This report maps the region’s rules, use cases, and RLUSD’s role.
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