# Ethereum Schedules Fusaka Hard Fork for December 3 Mainnet Activation ▴ News

**Published:** 2025-09-19
**Categories:** News

---

The Fusaka upgrade represents a critical evolution in Ethereum’s data layer architecture. By decoupling blob parameter adjustments from client-side updates, the system gains significant operational flexibility. This architectural choice enables a phased, methodical expansion of data availability for Layer-2 rollups. The immediate consequence is a structural reduction in the cost basis for L2 transactions, directly enhancing the capital efficiency of the entire rollup ecosystem.

This is a foundational infrastructure enhancement, designed to augment the network’s core throughput capacity. It reinforces the protocol’s capacity to serve as a primary settlement layer.

This upgrade codifies a strategic architectural shift, enabling phased data capacity expansion to systematically lower L2 operational overhead.

- 
**Mainnet Activation Date** ▴ December 3

- 
**Post-Activation Blob Capacity** ▴ Phased increase to 21 max blobs by January 7, 2026

- 
**Architectural Method** ▴ Blob-Parameter Only (BPO) forks

Signal Acquired from ▴ <a href="https://cointelegraph.com/news/ethereum-fusaka-upgrade-moves-to-december-blobs-to-double-after?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" target="_blank" rel="nofollow">Cointelegraph</a>

**Tags:** [Blob Capacity](https://options.greeks.live/area/blob-capacity/), [Mainnet Activation](https://options.greeks.live/area/mainnet-activation/), [Transaction Costs](https://options.greeks.live/area/transaction-costs/), [Layer 2 Networks](https://options.greeks.live/area/layer-2-networks/), [Data Availability](https://options.greeks.live/area/data-availability/), [Parameter Only Forks](https://options.greeks.live/area/parameter-only-forks/)	

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---

**Original URL:** https://options.greeks.live/news/ethereum-schedules-fusaka-hard-fork-for-december-3-mainnet-activation/
