Ethereum Fusaka upgrade enters final testnet phase, introducing approximately 16.78 million single transaction gas limit

ChainCatcher news, according to Cointelegraph, Ethereum is entering the final testnet phase before the Fusaka upgrade scheduled for December 3. This upgrade introduces a single transaction gas limit of approximately 16.78 million units to improve block efficiency and prepare the network for parallel execution. It has already been activated on the Holesky and Sepolia testnets.

The gas limit restricts the processing power available to a single transaction, ensuring that no single transaction can monopolize an entire block, thereby allowing the network to handle activity more evenly. The next phase of the Fusaka upgrade is planned to be deployed on the Hoodi testnet on October 28, with the mainnet launch expected in December 2025. The Fusaka upgrade (EIP-7825) is an important part of the Ethereum roadmap, following the Dencun upgrade in March 2024 and the Pectra upgrade on May 6, 2025.

This upgrade introduces the following changes: increasing Ethereum's default block gas limit to 60 million, setting the single transaction gas limit to 16.77 million (EIP-7825), and launching PeerDAS—the core feature of this upgrade. PeerDAS (Peer Data Availability Sampling) allows Ethereum nodes to store only a small random portion of second-layer "data blocks" instead of the entire dataset. This approach maintains network security while reducing hardware requirements and enables cheaper, higher-throughput scaling for layer 2 networks.