- Ethereum has scheduled the Fusaka upgrade for December 3, 2025, following a successful final testnet.
- The update introduces PeerDAS, a new data-sampling method expected to improve layer-2 transaction speed and cost by expanding blob space in blocks.
- Vitalik Buterin called PeerDAS “the key to layer-2 scaling.”
- Fusaka will build on the 2024 Dencun upgrade, which introduced blobs to temporarily store layer-2 data on Ethereum blocks.
- Market reaction to Fusaka is uncertain; ETH was down 2.3% at $3,760, while users expect a possible rise above $4,500 with 61% confidence.
Ethereum developers have confirmed December 3, 2025, as the official date for the Fusaka network upgrade. This decision follows a smooth final testnet completed earlier this week. The update aims to enhance network performance, particularly for layer-2 transactions.
The Fusaka upgrade will add PeerDAS, a new method for data sampling that increases the available “blob” space in each Ethereum transaction block. This expansion is expected to make layer-2 transactions faster and significantly cheaper over time. The upgrade was formally scheduled during a recent meeting.
Alex Stokes, the Ethereum developer heading the meeting, described Fusaka as “a really big deal.” The new PeerDAS feature was originally planned for the February 2025 Pectra upgrade but was postponed for further testing. The expansion builds upon the 2024 Dencun upgrade, which introduced “blobs” that temporarily store layer-2 data on Ethereum blocks, helping reduce gas fees and processing time.
Vitalik Buterin, co-founder of Ethereum, has described PeerDAS as “the key to layer-2 scaling.”i He suggested that Fusaka could be a crucial step toward Ethereum’s goal of becoming a global settlement layer for blockchain-based transactions once crypto reaches mass adoption.
At the time of announcement, the price of ETH was about $3,760, down roughly 2.3% for the week. After the previous Pectra upgrade, ETH price surged nearly 29% amid other favorable macroeconomic conditions. On the prediction market called Myriad, hosted by Decrypt’s parent company Dastan, users gave a 61% probability that ETH would move above $4,500 next, compared to a 39% chance it would dip below $3,100. The exact market impact of Fusaka remains uncertain.
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