Ethereum Completes Fusaka Testnet Launch on Hoodi Ahead of December Upgrade Launch

The much-anticipated Ethereum upgrade, Fusaka, has successfully completed its launch on the Hoodi testnet, paving the way for the mainnet activation later this year. The Fusaka upgrade will introduce the Ethereum network to PeerDAS, more blob capacity, and network stability improvements, with a proposed mainnet launch on December 3.

Ethereum Completes Fusaka Upgrade on Hoodi Testnet

Ethereum has completed another major milestone towards achieving improved scalability and security. Developers have announced the successful launch of the Fusaka upgrade on the Hoodi testnet, marking the final testing phase before it goes live on mainnet. 

The Hoodi testnet was the last of a three-stage simulation process following Fusaka activations on the Holesky and Sepolia testnets. A popular Ethereum client, Nethermind, wrote on X that the Hoodi Fork was “running seamlessly on the Nethermind Client.”

The Ethereum Foundation has announced that the Fusaka mainnet launch should be expected 30 days after the successful Hoodi activation. However, Ethereum developers have fixed December 3 as the tentative date for the activation of Fusaka on the mainnet.  

What To Expect From the Fusaka Upgrade

The Fusaka upgrade builds on the groundwork laid by April’s Pectra upgrade and is designed to improve the scalability, security, and cost efficiency of the Ethereum network. When Fusaka goes live on Mainnet, it will introduce several technical improvements spanning more than a dozen Ethereum Improvement Proposals (EIPs). 

One of the most highly anticipated improvements is the EIP-7594, or Peer Data Availability Sampling (PeerDAS). The EIP-7594 will allow validators to verify only portions of data, rather than entire “blobs” on the network, to reduce bandwidth demands and operational costs for validators and Layer 2 networks.

There is also a second blob capacity hard fork that will take effect as part of Fusaka to further improve the efficiency of the Ethereum network. EIPs 7825 and 7935 will set gas limits to enhance efficiency and prepare the network to run jobs simultaneously, and EIPs 7939 and 7951 will improve performance and sign a zero-knowledge proof.

Once these upgrades are live, they will reduce the transaction costs to users and developers and will also prepare the Ethereum network for the next stage of rollup scaling.

These upgrades will come in phases to the mainnet. After the launch, blob capacity increase should be expected on the network on December 17, while the second hard fork to expand blob capacity has a proposed date of January 7, 2026.

What Fusaka Means for Developers and Users

For developers, the increased blob size and PeerDAS feature that Fusaka brings would mean some changes for nodes and layer‑2 apps. Once Fusaka goes live, Ethereum developers will have to upgrade their software to work with Fusaka.

The developers will also be required to test their applications in order to confirm that they are compatible with the new upgrade. To users in the Ethereum network, Fusaka equates to faster transactions at reduced costs as well as safer smart contracts.

What’s Next for Ethereum?

When Fusaka goes live, it will improve the scalability of the Ethereum network to solve one of the “blockchain trilemmas,” a term coined by Ethereum co-founder Vitalik Buterin. After Fusaka, the next phase will be the Glamsterdam upgrade, which is also focused on making the Ethereum network more scalable.