Ethereum developers have officially confirmed the rollout schedule for the highly anticipated Fusaka upgrade during today’s ACDC 165 call.
The Fusaka upgrade aims to hit four major networks in quick succession. These are Holesky testnet on October 1, Sepolia on October 14, Hoodi on October 28, and the Ethereum mainnet on December 3.
Many people believe that the Fusaka upgrade is one of Ethereum’s most significant system-level updates in recent years. It presents a technique called PeerDAS (Peer Data Availability Sampling) that aims to significantly increase Ethereum’s resource efficiency, scalability, and data capacity.
By 2026, PeerDAS will allow Ethereum to theoretically process up to 12,000 transactions per second. This would open the door for more reliable, affordable, and quick Layer 2 solutions like rollups.
In contrast to prior high-profile upgrades such as The Merge and Pectra, Fusaka prioritizes improvements to the infrastructure behind the scenes over additions that are directly visible to users. It consists of about eleven Ethereum Improvement Proposals (EIPs) focused on infrastructure and aims to improve node health, network resilience, and the operational efficiency of validators and developers.
What the Fusaka Upgrade Means for Users and Developers
Each phase offers the developer community ample opportunity to run critical checks, hunt down bugs, and optimize performance. The multi-stage process also allows client teams, node operators, and infrastructure providers to harmonize software upgrades before the changes reach mainnet.
For everyday Ethereum users, the Fusaka upgrade plans to happen seamlessly in the background. Most popular wallets and exchanges will integrate the necessary changes automatically. However, validators and node operators must upgrade their clients before each network’s Fusaka fork. This is to avoid downtime or penalties, underscoring the need for technical vigilance as Ethereum evolves.
For builders and enterprises, the Fusaka upgrade is a game-changer. It increases the permissible smart contract code size (from 24KB to 48KB), introduces new opcodes for more efficient computation, and integrates cryptographic standards favored by enterprise and mobile platforms. These technical improvements empower developers to build richer, more scalable decentralized applications, especially as data throughput and Layer 2 efficiency grow.
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