Ethereum Foundation: The Fusaka upgrade is expected to be activated on the mainnet at 05:49 Beijing time on December 4th.

The Ethereum Foundation has announced the Fusaka upgrade, scheduled for activation on Ethereum mainnet slot 13,164,544, at 21:49:11 UTC on December 3, 2025 (05:49:11 Beijing time on December 4). This upgrade introduces a Blob-only (BPO) fork to safely scale blob throughput after PeerDAS activation. A key feature of Fusaka is PeerDAS (Peer Data Availability Sampling), which significantly improves blob throughput. Fusaka also optimizes the execution and consensus layers to enhance L1 layer performance and improve user experience.