The Ethereum Foundation has confirmed that the Fusaka upgrade will go live on December 3, 2025, at 21:49:11 UTC, at slot 13,164,544. The new hard fork is designed to boost performance and data availability on the mainnet, improving efficiency across both the consensus and execution layers.
What Fusaka Brings to Ethereum
Fusaka introduces two key innovations: the Blob-only fork and Peer Data Availability Sampling (PeerDAS). The Blob-only fork optimizes the management of large data volumes, allowing Ethereum to process temporary information without overloading permanent storage. PeerDAS implements a peer sampling system that increases data-handling capacity, reduces validator load, and improves network synchronization.
According to the Ethereum Foundation, these upgrades will enable greater scalability at the Layer 1 level and directly benefit Layer 2 solutions that rely on the base network’s efficiency. PeerDAS, in particular, will expand data execution capacity and strengthen interoperability across applications and rollups. Developers from Prysm and Lodestar emphasized that the rollout will proceed with extreme caution, prioritizing ecosystem stability and consensus integrity.
The market has reacted with a mix of caution and optimism. While ETH’s price has not shown significant movement, analysts expect Fusaka to strengthen Ethereum’s position against other high-performance blockchains, particularly in areas such as DeFi and modular rollups.
Ethereum Shows No Immediate Price Reaction to Upgrade News
ETH is currently trading at $3,338.50, with a market capitalization of $402.95 billion and an 11.89% market dominance. Daily trading volume stands at around $35.17 billion, reflecting a 50.22% drop compared to the previous day. Over the past week, ETH’s price has fallen 12.04%, marking a correction phase ahead of the upgrade launch.
Fusaka follows Dencun, the 2024 upgrade that significantly improved scalability and reduced transaction costs. With this new iteration, Ethereum continues to refine its infrastructure to support an increasingly complex ecosystem, where efficient data management will be the cornerstone of the next stage of expansion.