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Ethereum developers are targeting activation of the Glamsterdam upgrade on Sepolia at 13:53 UTC on Oct. 6, according to ACDC meeting 186 notes. The schedule remains provisional because Glamsterdam has not yet activated successfully on a stable devnet: Devnet-9 is failing to finalize, while earlier testing found a major consensus-layer bug and an execution-layer issue tied to EIP-8037. Developers are preparing Devnet-10.
Why it matters
The Sepolia date is a readiness checkpoint, not a confirmed mainnet launch. Ethereum's upgrade path still depends on a stable devnet before the testnet rollout can proceed. If Devnet-10 remains unstable or exposes another major issue, developers could postpone the Sepolia activation.
Market impact
The tentative schedule gives ETH markets a concrete near-term milestone, but no dates have been set for the Hoodi testnet or Ethereum mainnet. Developers still target a possible December mainnet launch, making Devnet-10 stability and the Sepolia checkpoint the key signals for the upgrade timeline.
Frequently asked questions
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Why is the Sepolia date still provisional?
Glamsterdam has not yet activated successfully on a stable devnet, and Devnet-9 is failing to finalize. If Devnet-10 remains unstable, the activation could be postponed.
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What issues surfaced during Glamsterdam testing?
Earlier testing found a major consensus-layer bug and an execution-layer issue tied to EIP-8037. Devnet-9 is also failing to finalize.
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What role does Devnet-10 play in the upgrade timeline?
Developers are preparing Devnet-10 as the next testing step. Its stability will help determine whether the Sepolia activation stays on track or is postponed.
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Have developers set Hoodi or Ethereum mainnet dates?
No. Dates have not been set for the Hoodi testnet or Ethereum mainnet, although developers still target a possible December mainnet launch.
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What should ETH markets watch next?
Devnet-10 stability and the tentative Sepolia checkpoint are the key signals. The possible December mainnet launch remains conditional on that testing path.
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