• Fusaka Mainnet Announcement Posted by Protocol Coordination Team on November 6, 2025 Protocol Announcements Fusaka follows this year’sPectra upgrade, representing a major step forward in Ethereum’s scaling roadmap that improves L1 performance, increases blob throughput, and enhances user experience. • The Fusaka network upgrade is scheduled to activate on the Ethereum mainnet at slot13,164,544(December 3, 2025, 21:49:11 UTC). • Fusaka also introduces Blob Parameter Only (BPO) forks to safely scale blob throughput after PeerDAS activation. • These are minimal, config-only upgrades that adjust the blob target/max and fee update fraction. • See theactivation tablebelow for further details. • The Fusaka mainnet client releases are listedbelow.
Article Summaries:
- Fusaka Mainnet Upgrade
Ethereum will activate the Fusaka upgrade on December 3, 2025 (slot 13,164,544). The upgrade introduces Peer Data Availability Sampling (PeerDAS), a networking protocol that lets nodes verify blob availability by sampling rather than downloading full blobs, enabling higher blob throughput without compromising security. Following PeerDAS, two Blob Parameter‑Only (BPO) forks will raise the per‑block blob target and maximum from 6/9 to 10/15 and then to 14/21. Fusaka also includes execution‑layer optimizations (ModExp cost adjustments, a transaction gas‑limit cap) and network‑protocol clean‑ups to improve L1 performance and user experience.
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