The Ethereum Foundation has announced the activation of the Fusaka network upgrade, set for December 3, 2025, at 21:49:11 UTC. This upgrade will occur at Ethereum mainnet slot 13,164,544. Fusaka introduces the Blob Parameter Optimization (BPO) fork, aimed at safely expanding blob throughput following the activation of PeerDAS. Key features of the upgrade include PeerDAS, which significantly enhances blob throughput, and various optimizations to the execution and consensus layers. These improvements are designed to boost Layer 1 performance and enhance the overall user experience on the Ethereum network.