Skip to content{"success":true,"data":{"id":"ethereum-foundation-a6hh54","title":"Glamsterdam Testnet Announcement","summary":"Glamsterdam follows the Fusaka upgrade, advancing Ethereum's L1 scaling roadmap with enshrined proposer-builder separation, block-level access lists, and changes to gas pricing that better reflect the cost of execution and state growth. The Glamsterdam network upgrade is scheduled to activate on Sepolia at epoch 353,024, slot 11,296,768 (October 6,...","canonicalUrl":"https://blog.ethereum.org/en/2026/09/17/glamsterdam-testnet-announcement","sourceName":"Ethereum Foundation Blog","sourceUrl":"https://blog.ethereum.org/","publishedAt":"2026-09-28T00:00:00.000Z","publishedPrecision":"datetime","updatedAt":null,"language":"en","timeZone":"UTC","region":"crypto","country":"","market":"Crypto / Web3","topics":["crypto","web3","technology"],"relatedAssets":[],"importance":"normal","image":null,"imageRights":null,"contentType":"official-release","disclosure":"Official-source metadata and summary. Follow the original link for the complete release.","provenance":{"sourceId":"ethereum-foundation","sourceType":"web3","official":true,"verification":"PRIMARY_SOURCE_METADATA","fetchedAt":"2026-09-29T09:57:33.902Z","stale":true,"archived":true,"classificationMethod":"RULE_BASED"}},"meta":{"generatedAt":"2026-09-29T10:01:58.348Z","providers":[{"id":"jiguang-news-archive","name":"Jiguang Finance source archive","kind":"news","status":"degraded","itemCount":1,"cache":"STALE","fetchedAt":"2026-09-29T09:57:33.902Z","sourceUrl":"https://jiguang.uk/sources.html","message":"Archived publisher metadata; original publication and fetch times retained. Archive availability is not source freshness."}],"stale":true,"apiVersion":"v2"},"error":null}