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Ethereum’s Fusaka Upgrade Clears Final Test, Mainnet Next
Last Updated: October 29, 2025
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Key Takeaways
- Ethereum’s Fusaka upgrade has passed final testing on the Hoodi testnet and is set to go live on the main network on December 3;
- Fusaka brings updates like PeerDAS, higher gas limits, and progress toward running smart contracts in parallel;
- The upgrade will roll out in three steps, after which focus will shift to Ethereum’s next update, Glamsterdam.
With this successful run, the network is set to activate the update on its main blockchain on December 3. The goal of this upgrade is to improve how the network handles traffic and to make it more secure.
On October 28, the software team at Nethermind confirmed that their validator client worked smoothly with the new changes.
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Fusaka includes several technical updates. One of them, called PeerDAS (short for Peer Data Availability Sampling), will help Ethereum handle data more efficiently by letting validators read smaller parts of data rather than large chunks.
Other planned changes will increase the gas limit and help the network move toward a feature called parallel execution. This feature will enable Ethereum to handle many smart contracts simultaneously.
Some of the updates will also support the development of rollups that use zero-knowledge technology, which helps make transactions faster and more private.
The Fusaka upgrade will be implemented in three phases. First, the mainnet will switch over to the new version. Then, Ethereum will increase the amount of data the network can store. After that, another update will raise that data limit again.
Once Fusaka is complete, developers will begin focusing on the next upgrade, called Glamsterdam.
Recently, the Ethereum development community introduced a new roadmap called Kohaku. What is it? Read the full story.
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