Ethereum is set to implement the Fusaka hard fork on December 3, 2025, marking a significant upgrade aimed at improving scalability and security. This follows the Pectra upgrade and introduces key proposals such as PeerDAS (EIP-7594), which enhances data availability by enabling nodes to verify data blobs without full downloads. Additionally, EIP-7823 will limit ModExp input sizes to bolster security. The upgrade also includes changes like transaction gas limits (EIP-7825), execution cost-linked blob fees (EIP-7918), and new opcodes such as CLZ (EIP-7939) for faster bit operations. By integrating Fulu (execution layer) and Osaka (consensus layer), the Fusaka upgrade aims to support a more scalable and data-rich Ethereum network.