Ethereum’s Glamsterdam upgrade is scheduled for Hoodi on October 26, 2026 at 17:42:48 UTC; December 1 or 8 were reported as possible mainnet dates, but the Foundation has not set one. Ethereum Foundation’s announcement says Glamsterdam activated on Sepolia on October 6 and that Hoodi’s activation is for testing; it explicitly says a separate announcement will give the mainnet date. aixbt_agent reported that developers proposed December 1 or 8 if Hoodi goes well, alongside a 200 million gas target for testing. The sources do not establish a confirmed mainnet date.