Sepolia Schedules Testnet Fork as Glamsterdam Upgrade Nears
Ethereum's Glamsterdam upgrade is one step closer to reality as the Sepolia testnet fork has been scheduled for October 6, 2026. This marks significant progress towards scaling upgrades on the Ethereum network.
The distinction between a testnet fork and mainnet deployment is crucial. The roadmap lists mainnet deployment in Q4 2026, but notes that this date has not been confirmed. A testnet fork is a rehearsal, not a production release, allowing developers to identify bugs and make necessary adjustments before going live.
The upgrade's scope is currently frozen due to the meta Ethereum Improvement Proposal remaining in draft form. However, as devnets surface bugs and proposals graduate to public testnets like Sepolia, further development will continue.