One of the biggest updates to Ethereum (ETH) in years is just around the corner. At the beginning of December, the network will receive a series of technical innovations that, according to developers, will pave the way for a new phase of scalability.
What does the Fusaka upgrade mean for Ethereum?
Fusaka is the next big step in Ethereum’s development. The upgrade will go live on December 3, 2025, to be precise during slot 13,164,544 (similar to the block time for Bitcoin (BTC)).
The core of the upgrade revolves around scalability. To enable faster and cheaper transactions, Fusaka focuses mainly on rollups. These are technologies that process transactions outside Ethereum and then place them on the network as one package, reducing costs and speeding up processing.
Fusaka increases the data capacity for these rollups and makes the network lighter and more secure at the same time. The upgrade therefore forms the basis for a multi-year scaling program that could ultimately bring the transaction speed towards 100,000 transactions per second.
PeerDAS and other big changes
The most important part to increase scalability is PeerDAS. This new method ensures that validators no longer have to download all rollup data. Instead, they only check small pieces of data to see if the full data is available.
PeerDAS allows nodes to use significantly less bandwidth and storage and creates space for much larger transaction bundles, possibly up to eight times more than today, according to developers. That’s especially important for Layer 2 (L2) networks, the additional layers on top of Ethereum that process transactions off the main chain and then return them as one packet. The larger these bundles can be, the more L2s can transmit at once and the lower the costs per transaction.
Fusaka is also introducing so-called BPO forks. These are small interim updates that allow developers to simply increase the settings for the amount of rollup data. By regularly adjusting these values, the network remains flexible and increases in scale can be implemented in small steps, without having to wait years for a major hard fork.
In anticipation of Fusaka, Ethereum has increased the gas limit per slot from 45 to 60 million. The majority of validators agreed. The gas limit determines how much calculation can be processed in one block or slot. By increasing that limit, Ethereum can accommodate more transactions and reduces the pressure during peak times.
Wat to like the Fusaka?
The next big step after Fusaka is the upgrade called Glamsterdam, expected in 2026. Developers want to implement a number of long-planned improvements. An important component is ePBS, a built-in system that should better protect the network against risks surrounding Maximum Extractable Value (MEV).
MEV stands for the extra profit a validator can make by arranging transactions in a favorable order. That can lead to unfair block production. ePBS should make such practices more difficult and keep the network more fair.
Important steps before Fusaka were the Merge in 2022, when Ethereum switched to proof-of-stake (PoS). In this system, the network is secured by validators that lock up crypto, instead of through energy-intensive mining as with Bitcoin. The Dencun upgrade followed in 2024, which brought the first big leap in rollup scalability with new data techniques. Several more improvements followed, including Pectra in 2025.
Will there be another big ETH rally?
Traders are also watching intently what the Fusaka upgrade can do to the Ethereum price. Dutch analyst Ted points out that ETH rose by 50 percent in May after the Pectra upgrade. He now wonders again whether another strong rise is in prospect as Fusaka approaches. If Ethereum makes a similar move, it would mean a price around $4,500.
Source: https://newsbit.nl/grote-ethereum-upgrade-nadert-dit-gaat-er-veranderen/
