Ethereum Foundation Sets Glamsterdam Sepolia Testnet Activation for Oct. 6
The Ethereum Foundation scheduled Glamsterdam for Sepolia on Oct. 6 at 13:53:36 UTC, while Hoodi and mainnet dates stay undecided.
Why it matters
The Sepolia activation is a public-network test rather than a mainnet event, so the practical effect for ETH holders on mainnet is limited until a mainnet date is set. What is scheduled is the widest protocol change to block production and validation since the Merge per CoinGape, and the gas repricing can force edits to contracts that assume fixed stipend levels.
Where the sources disagree
Mainnet launch timing for Glamsterdam
Q4 2026, with no official date yet
U.Today, Crypto News (CryptoNews.net)
No mainnet date set or announced
Cointelegraph, Crypto.News, CoinGape
U.Today and Crypto News place the mainnet launch in Q4 2026 while Cointelegraph, Crypto.News and CoinGape report that no mainnet date has been set and none is official.
Hoodi testnet timing
Tentatively discussed for October 27, unconfirmed
Crypto.News
No date set
Cointelegraph, CoinGape
Crypto.News reports Hoodi is tentatively discussed for October 27 while developers have not confirmed it, and the other outlets that address Hoodi simply say no date is set.
Characterization of the upgrade's development stage
Final stretch, per Ethereum Foundation researcher Toni Wahrstätter
U.Today, Crypto News (CryptoNews.net)
According to reports, with no named source
Bitcoin Insider
U.Today and Crypto News describe the work as in its final stretch based on one researcher's post, while Bitcoin Insider, an aggregator, refers only to unnamed reports that developers plan an October testnet deployment without naming a source.
Key facts
The Ethereum Foundation scheduled Glamsterdam to activate on the Sepolia testnet on October 6, 2026 at 13:53:36 UTC, at epoch 353,024 and slot 11,296,768.
Disputed figureReported by Cointelegraph
Sepolia node operators must update both execution-layer and consensus-layer clients before the activation.
Reported by Cointelegraph
Hoodi and mainnet activation dates for Glamsterdam remain undecided.
Reported by Cointelegraph
Glamsterdam combines the Amsterdam execution-layer upgrade with the Gloas consensus-layer upgrade.
Reported by Crypto.News
Glamsterdam enshrine proposer-builder separation, moving the handoff between block builders and validators into the protocol.
Reported by Cointelegraph
Glamsterdam introduces block-level access lists, tracked as EIP-7928, which record the accounts and storage locations used in each block.
Reported by Cointelegraph
Glamsterdam changes gas pricing to better reflect data creation and access costs, and contracts relying on fixed gas stipends or hardcoded limits may need changes.
Reported by Cointelegraph
Ethereum Foundation researcher Toni Wahrstätter said on X that Glamsterdam and EIP-7928 are close to the final mile.
Reported by U.Today
What happened
The Ethereum Foundation said on Monday that the Glamsterdam upgrade will activate on the Sepolia testnet on Oct. 6 at 13:53:36 UTC, at epoch 353,024 and slot 11,296,768, and Sepolia node operators must update both execution-layer and consensus-layer clients before activation. Glamsterdam bundles the Amsterdam execution-layer upgrade with the Gloas consensus-layer upgrade, and its headline changes include proposer-builder separation written into the protocol, block-level access lists that record the accounts and storage slots touched in each block, and gas pricing changes meant to reflect the cost of creating and accessing data; contracts with fixed gas stipends or hardcoded limits may need edits. Ethereum Foundation researcher Toni Wahrstätter wrote on X that Glamsterdam and EIP-7928, the block-level access lists, are near the final mile, and U.Today reported that he expects Glamsterdam to be one of the biggest forks yet. U.Today and Crypto News frame the upgrade around three aims, faster processing through parallelization, capacity increases and snap v2 syncing, and protection against database bloat. Hoodi and mainnet dates remain unset, though Crypto.News reports Hoodi is tentatively discussed for October 27 without confirmation, and U.Today and Crypto News both put the mainnet launch in Q4 2026 with no official date. Cointelegraph reports the following upgrade is targeted for 2027 under the name Hegotá, and both Cointelegraph and Crypto News quote Vitalik Buterin saying on Sunday that Hegotá could be the last 'normal' fork before work shifts to recursive STARKs, automated formal verification, optimized consensus and quantum-safe cryptography. CoinGape, reporting the same day as Cointelegraph and Crypto.News, separately said ETH overtook BTC in perpetual futures open interest on Hyperliquid on Tuesday.
How the story developed
- Update
Buterin says Hegotá could be Ethereum's last normal fork
On Sunday the Ethereum co-founder said the upgrade expected to follow Glamsterdam might be the last 'normal' hard fork before development shifts to recursive STARKs, automated formal verification, optimized consensus and quantum-safe cryptography; Cointelegraph puts Hegotá in 2027.
- First report
First report by U.Today
Ethereum's Glamsterdam Upgrade in Final Stretch, Here Are Key Dates to Watch
- Update
Ethereum Foundation researcher says Glamsterdam and EIP-7928 are near the final mile
Toni Wahrstätter posted on X that the upgrade and block-level access lists are close to completion, with testing continuing on devnets.
- Official statement
Ethereum Foundation sets Sepolia activation for Oct. 6
The foundation announced Glamsterdam will activate at epoch 353,024 and slot 11,296,768 on Sepolia, at 13:53:36 UTC, and told Sepolia node operators to update execution and consensus clients beforehand. Hoodi and mainnet dates stayed undecided.
- Independent corroboration
Independently corroborated by Cointelegraph
Ethereum schedules Glamsterdam upgrade on Sepolia for Oct. 6
How coverage built up
Independent sources over time, counted the way the consensus panel counts them: a republication of a wire story does not move the line.
- 27 Sept 2026, 14:15 UTC: U.Today — 1 independent source, 1 reports
- 27 Sept 2026, 15:40 UTC: Bitcoin Insider — 2 independent sources, 2 reports
- 29 Sept 2026, 10:46 UTC: Cointelegraph — 3 independent sources, 4 reports
- 29 Sept 2026, 10:59 UTC: Crypto.News — 4 independent sources, 5 reports
- 29 Sept 2026, 11:06 UTC: CoinGape — 5 independent sources, 6 reports
Affected entities
Also mentioned: Base, Bybit
Original sources
| Publisher | Report | Role | Published |
|---|---|---|---|
| U.Today Crypto media | Ethereum's Glamsterdam Upgrade in Final Stretch, Here Are Key Dates to Watch | Original | |
| Cointelegraph Crypto media | Ethereum schedules Glamsterdam upgrade on Sepolia for Oct. 6 | Independent | |
| Crypto.News Crypto media | Ethereum will test a major speed upgrade on Oct. 6 | Independent | |
| CoinGape Crypto media | ETH Flips BTC on Hyperliquid as Ethereum Foundation Confirms Glamsterdam Upgrade Date | Independent | |
| Bitcoin Insider Aggregator | October Testnet Deadline Puts Ethereum’s Glamsterdam Upgrade in Final Stretch | Syndicated | |
| Crypto News (CryptoNews.net) Aggregator | Ethereum Glamsterdam upgrade enters final phase ahead of October testnet | Syndicated |
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