Ethereum’s Fusaka Upgrade Set for December 3, 2025
Ethereum’s highly anticipated Fusaka upgrade will debut on December 3, 2025. Ethereum developers announced this milestone during their AllCoreDevs meeting, marking a slight delay from the initial November timeline.
Fusaka aims to enhance Ethereum’s scalability, focusing on Layer 2 (L2) networks. It bundles 11 Ethereum Advancement Proposals (EIPs) to optimize the core protocol, unlike previous user-facing updates like Pectra.
christine D.Kim, an Ethereum researcher, revealed that testnet upgrades on Holesky, Sepolia, and Hoodi will happen in October. Exact dates will be shared soon.
- Testnet upgrades in October
- Main network launch on December 3, 2025
- Blob capacity increase in two steps post-upgrade
To support this, two Blob Parameter Only upgrades will follow. These will escalate blob capacity from 6 to 15, and later to 21 blobs per block. Blobs are special data packets vital for affordable rollup operations.
For Fusaka’s launch, the ethereum Foundation started a four-week audit contest offering up to $2 million in rewards. This encourages researchers to find any potential bugs.
Post-upgrade, Ethereum aims for 12,000 transactions per second by 2026. Fusaka won’t alter smart contracts right away but will set the stage for meaningful improvements in scalability.
the upgrade will cut gas fees for L2 projects, making Ethereum more accessible for DeFi, gaming, and real-world asset protocols. New spam-prevention measures will maintain stability by increasing costs for flood attacks while keeping user fees unchanged.
with Fusaka, the countdown starts. Stay tuned for October testnets and the December mainnet launch as Ethereum moves towards better scalability.
