Ethereum Schedules Fusaka Upgrade with PeerDAS Launch for Dec. 3

Highlights:

• Ethereum confirms December 3 as the Fusaka Upgrade mainnet launch.
• PeerDAS enables faster and cheaper Layer-2 transactions.
• Fusaka boosts blob space and gas limits for better scalability.

Ethereum developers’ core team has officially decided upon the date of the Fusaka Upgrade on December 3, 2025, signaling the second hard fork of the network for the year. This upgrade is a result of the successful testing conducted on Holesky, Sepolia, and eventually, the Hoodi testnet.

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The mainnet implementation is scheduled to occur when the blockchain reaches slot 13,164,544, approximately 21:49 UTC. The confirmation was made during the All Core Developers Consensus Layer call on Thursday. Two days after the last testnet passed without complications, the developers and researchers agreed on this date.

Fusaka Upgrade Features PeerDAS for Layer-2 Scaling

The main feature of the Fusaka Upgrade is PeerDAS, which stands for Peer Data Availability Sampling, allowing the validators to check only a portion of the data and not the whole blobs. Thus, the upgrade reduces the bandwidth and accelerates the transactions on Layer-2 networks, giving them lower costs.

All Core Devs – Consensus (ACDC) #168

🦓 Fusaka upgrade: 📅 mainnet Dec 3! BPO1 Dec 9, BPO2 Jan 7; releases Nov 3
⭐️ Glamsterdam upgrade: CL scope writeups Nov 13, FOCIL adds ~2 months; mascot?
🐡 PeerDAS cell-level deltas: unlock 72 max blobs
🌟 H-star upgrade: named Heka pic.twitter.com/Q83Wgx71Dg

— abcoathup.eth 🐡 🛡️🦇🔊 (@abcoathup) October 31, 2025

Initially, PeerDAS was a part of the Pectra upgrade, but later on was postponed for thorough testing. Ethereum co-founder Vitalik Buterin highlighted PeerDAS as “the key to layer-2 scaling” in September. Developers are convinced that this transformation supports the Ethereum vision of becoming a global transaction platform with low-cost transactions.

In addition to the PeerDAS feature, the upgrade will raise the block gas limit from 30 million to 150 million units. The change is backward-compatible and encompasses about a dozen Ethereum Improvement Proposals. These proposals are aimed at performance, efficiency, and developer experience.

Community Anticipation Builds After Successful Testnets

Fusaka passed all tests after going live on three testnets without problems. The developers expressed confidence in the product’s readiness during the conference. Alex Stokes, the Ethereum Foundation researcher who guided the meeting, said,

“Let’s go ahead and do this. This is a really nice fork.”

Ethereum’s Dencun upgrade came up with the idea of blobs for temporary data storage. Fusaka now improves on that by doubling the blob size of each block. This development helps Layer-2 chains to scale up even more and, at the same time, reduce network congestion.

The Ethereum Foundation had already come up with a four-week audit contest in September. The contest awarded up to $2 million to the security researchers who found vulnerabilities before the mainnet launch. This step showed the importance of the upgrade and the need for thorough testing.

Researchers. The @ethereum Fusaka Audit Contest and your chance at rewards of up to $2,000,000 is almost here.

Mark your calendars for September 15th. pic.twitter.com/aRpMEwI5Dh

— SHERLOCK (@sherlockdefi) August 26, 2025

Developers Eye Faster Transactions and Lower Fees

The Fusaka Upgrade is a step forward in the direction of Ethereum’s scaling roadmap. It not only doubles the blob capacity but also ensures quicker transaction processing, thus resulting in lower fees and users as well as developers being the beneficiaries.

The increased data per block results in little or no delays and much better throughput. The Layer-2 chains will gradually become more flexible and reliable due to these changes. Furthermore, developers will get more opportunities to create large-scale decentralized applications with fewer infrastructure constraints.

Ethereum’s native token, ETH, hit a new all-time high at $4,953 in August this year. However, recent market fluctuations have seen ETH correct, even dropping below the $4,000 mark several times before recovering again. Currently, ETH is trading around $3,838 with a market capitalization of $460 billion.

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