# Fusaka Testnet Announcement

DevFeed: [Fusaka Testnet Announcement](<https://devfeed.tech/articles/fusaka-testnet-announcement-17185.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2025/09/26/fusaka-testnet-announcement>)

Author: EF Protocol Support

Published: 2025-09-26T00:00:00Z

Content type: news

Language: en

Sources: [Ethereum Foundation Blog](<https://devfeed.tech/sources/ethereum-foundation-blog.md>)

Topics: [Ethereum](<https://devfeed.tech/topics/ethereum.md>), [Network](<https://devfeed.tech/topics/network.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [releases](<https://devfeed.tech/topics/releases.md>)

Tags: [announcement](<https://devfeed.tech/tags/announcement.md>), [availability](<https://devfeed.tech/tags/availability.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [network](<https://devfeed.tech/tags/network.md>), [networking](<https://devfeed.tech/tags/networking.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [protocol-announcements](<https://devfeed.tech/tags/protocol-announcements.md>), [releases](<https://devfeed.tech/tags/releases.md>), [scale](<https://devfeed.tech/tags/scale.md>)

## AI overview

Ethereum's Fusaka upgrade introduces PeerDAS and planned Blob Parameter Only forks to increase blob throughput while maintaining data-availability guarantees. The article announces activation schedules for the Holesky, Sepolia, and Hoodi testnets and describes expected scaling benefits for layer 2 rollups.

## Source excerpt

Fusaka follows this year's Pectra upgrade, representing a major step forward in Ethereum's scaling roadmap by introducing PeerDAS and key improvements that enhance blob throughput, L1 performance, and user experience. This post announces the testnet activation schedule for the first three testnets, beginning with Holesky at slot 5,283,840 (October...