Ethereum Fusaka Upgrade Rolls Out Key Testnet Features

Ethereum has reached an important milestone, as reported by Cointelegraph. The Fusaka upgrade is now live on the Hoodi testnet. This is a practice network where developers can test changes before going live on the main Ethereum network. The mainnet launch is said to be planned for December 3, 2025.

⚡️ UPDATE: Ethereum's Fusaka fork goes live on Hoodi testnet, setting the stage for Dec. 3 mainnet launch with security and scalability improvements. pic.twitter.com/ZQO7Kk7yWr

— Cointelegraph (@Cointelegraph) October 29, 2025

This is exciting news for anyone using Ethereum. The upgrade focuses on making the network faster, safer and able to handle more users and applications.

What Fusaka Does

Fusaka is not about flashy features. Instead, it improves the network in ways that most users will notice indirectly. The main goals are speed, security and efficiency.

For example, the upgrade introduces Peer Data Availability Sampling (PeerDAS). This helps nodes check data without downloading everything. It also saves time and computing power.

Moreover it increases the size of blobs, the data packets used by layer‑2 applications like rollups. This means Ethereum can handle more transactions at once.

Some riskier changes, such as certain Ethereum Improvement Proposals, have been delayed. The focus is on making the network more stable and reliable.

Testnet Timeline

Ethereum is following a careful plan to make sure everything works. First, upgrades go to smaller testnets, then bigger ones, before reaching mainnet.

• Holesky testnet: early October
  
• Sepolia testnet: shortly after Holesky
  
• Hoodi testnet: now live
  
• Mainnet: December 3, 2025 (tentative)
  

This phased approach allows developers to find bugs and fix them before the mainnet. It also gives users confidence that the network will run smoothly.

What This Means for Developers and Users

Developers will need to update their software to support Fusaka. They also need to test their applications to make sure they work with the new system. The larger blob size and PeerDAS feature mean some changes for nodes and layer‑2 apps.

For regular users, the upgrade should bring faster transactions and lower fees. Most importantly, funds and smart contracts remain safe. Fusaka is backward compatible, which means users don’t have to worry about losing their crypto.

Next Steps for Ethereum Scaling

After Fusaka, Ethereum plans to increase blob capacity further with follow-up updates. This is part of the network’s long-term roadmap to handle more users, more transactions and bigger applications.

The Ethereum Fusaka upgrade shows that Ethereum is growing. It is becoming faster, safer and more capable of handling global traffic. It also makes the network more efficient for developers building applications on Ethereum.

Fusaka’s Impact on the Network

Ethereum’s Fusaka upgrade is an important step forward. The testnet launch on Hoodi allows developers to test the system safely. If all goes well, the mainnet launch in December will improve speed, lower fees and make Ethereum stronger.

For developers, it means updating and testing applications. While for users, it means a smoother and more reliable Ethereum experience. Fusaka is another step in Ethereum’s journey to become a fully scalable and safe blockchain for the future.