Ethereum developers have tentatively scheduled the Glamsterdam upgrade for Ethereum’s Sepolia testnet on October 6 at 1:53 p.m. UTC, although private dev testing continues to uncover bugs.
The date gives developers a path to a mainnet release in December, but it remains conditional on the next phase of testing being able to produce a stable network.
Glamsterdam date depends on Devnet testing
Christine D. Kim, Protocol Specialist note in its latest newsletter, the developers accepted the Sepolia date of October 6 while acknowledging several caveats, the most important of which is that Glamsterdam has not yet successfully run on a stable private devnet.
Glamsterdam-Devnet-9 launched on September 1 with 1,000 validator nodes, making it the largest development of its type in terms of node count to date. But the network is not finalizing, which means too few validators are properly proposing and attesting to who is responsible for the chain.
Stefan Starflinger, development operations engineer at the Ethereum Foundation (EF), said the network’s size exposed issues, noting that it “showed that there were still a number of edge cases and issues” that needed to be addressed. He added that the previous devnet, Devnet-8, had an even more serious flaw, a bug that could freeze the entire network if a validator proposed a block sharing its parent’s hash.
Separately, EF researcher Maria Silva reported a bug related to EIP-8037, the increased cost of state creation gas, which will force every execution layer client to update their code.
Due to these fixes, another Devnet is coming, and as of this week, the one to watch is Devnet-11, not 10 as originally planned. Parithosh Jayanti, the Ethereum Foundation developer operations engineer who chaired the call, said that if the new devnet fails again, “we’ll have to go on a case-by-case basis” about whether Oct. 6 still works.
Dates of Hoodi and Mainnet remain uncertain
Developers have also delayed setting a date for Hoodi, Ethereum’s second public testnet currently being rolled out, with Consensys’ Enrico del Fante saying it would be reasonable to wait a few more weeks before committing to Hoodi given the issues encountered on Devnet-9.
The uncertainty extends to the main network. Developers are still hopeful that the upgrade can reach the Ethereum mainnet before the end of 2026, but the Sepolia date does not make the outcome more certain, especially since client implementations are not yet considered ready for the mainnet.
As CryptoPotato As previously reported, Ethereum’s broader roadmap foresees activation of the Glamsterdam mainnet for December 2026, before a separate push towards quantum-resistant infrastructure targeted for 2029.
This plan, tied to the Hegotá upgrade that follows Glamsterdam, indicates that Ethereum will ship major changes approximately twice a year, a pace it maintained last December when Fusaka was activated on schedule.
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