SecurityTokenizer
Subscribe Our Newsletter
Ethereum targets Oct. 6 for Glamsterdam on Sepolia
204
Sep 11, 2026
Ethereum developers have tentatively scheduled the Glamsterdam upgrade for activation on Sepolia at 13:53 UTC on Oct. 6, 2026, while another private devnet test remains necessary before the public testnet fork proceeds.
ACDC #186 meeting notes and subsequent reporting from Ethereum protocol researcher Christine D. Kim show that the date remains conditional. Developers had not completed a stable Glamsterdam activation on a private development network when they selected the Sepolia schedule.
The testing plan has since moved forward by another iteration. Kim said on Sept. 11 that attention had turned to Glamsterdam-Devnet-11, which is expected to launch on Monday, Sept. 14. Earlier plans had identified Devnet-10 as the next major test.
No activation dates have been confirmed for the Hoodi testnet or Ethereum mainnet. Developers have discussed a possible December mainnet release, but testing results will determine whether that schedule remains practical.
Ethereum Glamsterdam upgrade date remains tentative
During the Sept. 3 All Core Developers Consensus meeting, participants agreed on Sepolia epoch 351232 for the proposed activation. Kim reported that the corresponding time would be Oct. 6 at 13:53 UTC. The meeting was held before developers had demonstrated stable performance across the private test networks used for Glamsterdam.
Selecting the epoch gives client teams, infrastructure operators and application developers a common planning target. It does not make the activation final. Developers can postpone the fork if the next testing phase uncovers a major fault or if client teams cannot prepare reliable releases.
The caveat remains relevant after Devnet-9 experienced finality problems. According to the meeting material, the network included approximately 1,000 validator nodes, making it the largest Glamsterdam devnet by validator count at that stage.
Finality requires enough validators to agree on the state of the chain. When a test network fails to finalize, developers must determine whether the cause involves client software, validator participation, network configuration or an interaction between separate protocol changes.
Devnet-11 will test fixes before Sepolia
The original plan called for Devnet-10 after faults appeared during previous trials. Kim’s latest update now identifies Devnet-11 as the next test that developers are watching, indicating that the private testing sequence advanced beyond the earlier plan.
A stable Devnet-11 would give Ethereum client teams another environment for testing the combined Glamsterdam specifications. Layer-2 teams, staking providers and other infrastructure operators need working client implementations before they can safely test their systems against the proposed fork.
Client diversity makes the process more complex. Ethereum operates through several independently developed execution and consensus clients, and the upgrade must work across different client combinations. A fault confined to one implementation can still interrupt a test network when affected validators hold enough weight.
Source>> Ethereum targets Oct. 6 for Glamsterdam on Sepolia
Trending News
Subscribe Our Newsletter