Ethereum’s Fusaka Upgrade Set for December With Bigger Blobs Coming

Upgrade timeline locked in

Ethereum developers confirmed the Fusaka hard fork will launch on December 3. The upgrade packs 12 EIPs to boost scalability, improve security, and cut costs.

Blob expansion follows

Blob capacity will more than double in two waves. The first increase hits Dec. 17, and another lands on Jan. 7, 2026. Researcher Christine Kim said blobs will scale safely with new blob-parameter forks (BPOs).

Testing and audits

Three public testnets will run from October to November. Ethereum is also funding a $2 million code audit to catch vulnerabilities in Fusaka’s code.

Why blobs matter

Blobs store large chunks of data offchain. This reduces mainnet pressure and makes layer-2 networks cheaper and faster. Since the March 2024 Dencun upgrade, average blob use has jumped from 0.9 to 5.1 per block.

Staking exit queue spikes

Validators are leaving in record numbers. Over 2.6 million ETH ($12B) hit the exit queue last week. The wait time now sits around 43 days. Vitalik Buterin defended the long queue, warning that cutting it down would make Ethereum “less trustworthy.”