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Ethereum Foundation Schedules Fusaka Upgrade for December 3, 2025

Ethereum Foundation announces the Fusaka mainnet upgrade, featuring Blob-Only Parameter fork for post-PeerDAS blob throughput expansion and Layer 1 performance improvements.

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Summary

According to the Ethereum Foundation’s official statement, the Fusaka mainnet upgrade is set for slot 13,164,544 on December 3, 2025 UTC. The update will implement a Blob-Only Parameter fork to increase blob throughput following PeerDAS activation. Additionally, execution and consensus layer enhancements aim to boost Layer 1 efficiency. This upgrade is positioned as a key step in Ethereum’s scalability strategy.

Terms & Concepts
  • Blob-Only Parameter fork: A protocol upgrade on Ethereum that focuses solely on increasing blob data throughput parameters without altering other chain rules.
  • PeerDAS: A data availability sampling feature designed to improve scalability by enabling efficient verification of blob data.
  • Execution layer: The Ethereum network subsystem responsible for executing transactions and smart contracts.