Ethereum is preparing to test its next major upgrade, called Glamsterdam, on a public test network on Oct. 6, 2026. The test is scheduled for the Sepolia testnet and marks a key step before any changes could reach the main Ethereum network where real funds are held.
A merged core-developer scheduling proposal sets the Glamsterdam activation on Sepolia at epoch 353,024, slot 11,296,768, corresponding to Tuesday, Oct. 6, 2026 at 13:53:36 UTC. Timing for Ethereum’s Hoodi testnet and mainnet remain to be determined. For related coverage, see Citi Clients Can Accept Stablecoins Through Spring by Citi.
What Is Sepolia and Why Does This Test Matter?
Sepolia is one of Ethereum’s public test networks, environments that mimic how Ethereum works but use tokens with no real monetary value. Developers use testnets to run upgrades and catch problems before making any changes to the live network where real money is at stake. For related coverage, see How the First Major AI Hack Targeted Bitcoin Users.
Think of it like a dress rehearsal. If something goes wrong on Sepolia on Oct. 6, engineers can identify and fix the issue without any risk to people’s actual funds. A successful Sepolia run is a prerequisite for moving forward with broader deployment discussions.
Glamsterdam is the name for Ethereum’s next combined upgrade. The name blends “Gloas” and “Amsterdam,” following Ethereum’s tradition of naming upgrades after cities that have hosted its developer conferences. The official Ethereum roadmap confirms the Sepolia fork on Oct. 6, 2026 as the upgrade’s next milestone, while noting that a mainnet date has not been set.
What Glamsterdam Includes
Two notable changes are part of Glamsterdam. The first is enshrined proposer-builder separation, or ePBS, which expands the window for block propagation from 2 seconds to about 9 seconds. This gives validators more time to receive and process blocks, improving network reliability.
The second is Block-Level Access Lists, defined in EIP-7928. These provide an upfront map of which parts of the blockchain each transaction will touch, enabling Ethereum to begin processing multiple transactions at once rather than one after another. This is a building block for parallel transaction processing, which could increase Ethereum’s throughput in the future.
On the engineering side, Ethereum’s execution-specs team reviewed all 15 execution-layer EIPs included in Glamsterdam and expanded the Amsterdam test suite from 3,996 unique parameterized cases to 4,824, a net increase of 828 cases, or about 21%. Greater test coverage means engineers have stronger confidence that edge cases have been examined before deployment.
ETH, Ethereum’s native token, was trading at $2,730.85 at the time of writing, up about 2.4% over the previous 24 hours, with a market capitalization near $333 billion. The broader crypto market sentiment indicator, the Fear & Greed Index, sat at 73, a reading classified as “Greed.”
What to Watch After Oct. 6
The Oct. 6 Sepolia test is the immediate event to follow. If the activation completes without issues, Ethereum developers would likely discuss next steps for Hoodi, another testnet, before any conversation about a mainnet date.
Post-test developer call notes and client team announcements will carry the next confirmed signals about the upgrade’s progress. The broader institutional environment for crypto is also developing in parallel, as seen with the CFTC approving Coinbase Clearing as a derivatives clearinghouse and Greece adding its first providers to the EU’s MiCA register, both signs of maturing market infrastructure.
Anyone holding ETH or using Ethereum-based applications does not need to take any action at this stage. Testnet activity has no direct effect on mainnet assets or applications. This is a technical milestone, and the next confirmed signal will come from developer communications after the Oct. 6 activation. The Cardano Foundation’s recent blockchain education partnership with UCLA Anderson reflects the kind of long-term ecosystem-building that public blockchain networks, including Ethereum, are investing in alongside technical upgrades.
Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always consult a qualified financial professional before making investment decisions.
Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.
