Ethereum’s Fusaka Upgrade Goes Live on Sepolia — Mainnet Launch Set for December

Ethereum just deployed its most anticipated performance upgrade of the year. The Fusaka upgrade boosts block capacity, introduces data sampling tech, and moves the world’s largest smart contract network closer to true scalability.

⚡ Quick Hits

• 🧱 Upgrade: Fusaka (EIP-7594)
• 🧪 Deployed on: Sepolia testnet
• 🚀 Mainnet launch: December 2025
• ⛽ New block gas limit: 60 million
• 🧩 Core feature: PeerDAS (Peer Data Availability Sampling)
• ⚙️ Goal: higher throughput, faster validation, better scalability

🔥 What Fusaka Brings to Ethereum

Ethereum’s Fusaka upgrade just went live on the Sepolia testnet, marking a major milestone in the network’s ongoing evolution.

Following multiple test runs on Holesky, Fusaka introduces a 60 million block gas limit — a significant jump that allows for more complex transactions and higher-capacity smart contracts per block.

“This upgrade forms a vital part of our roadmap toward a more scalable and efficient network,” said the Ethereum development team.

This enhancement directly addresses one of Ethereum’s longest-standing pain points — scalability — without sacrificing decentralization or network reliability.

By handling larger transaction loads more efficiently, Ethereum positions itself to support enterprise-grade dApps, high-frequency trading, and large-scale DeFi ecosystems.

🧠 Inside the Tech: PeerDAS (EIP-7594)

The headline innovation of Fusaka is Peer Data Availability Sampling (PeerDAS) — a method that allows validators to confirm transaction data without downloading entire blocks.

Instead, validators sample portions of data from multiple peers, verifying authenticity through distributed redundancy.

That means:

• ⚡ Faster processing — lighter load per validator
• 🧱 Higher data availability — even under congestion
• 🧠 Improved efficiency — validators handle more transactions with fewer resources

This marks a pivotal shift in how Ethereum manages on-chain data — transitioning toward a modular, bandwidth-optimized validation layer capable of supporting future Layer 2 and rollup growth.

🧩 Why It Matters

Fusaka isn’t just another upgrade — it’s the infrastructure layer that sets the stage for Ethereum’s next evolution: more throughput, more decentralization, and fewer bottlenecks.

With data availability becoming a key battleground for Layer 1 chains, PeerDAS gives Ethereum a competitive edge over newer high-throughput blockchains by leveraging its massive validator set more intelligently.

“We believe Fusaka’s features will significantly enhance the performance of the network,” the Ethereum dev team emphasized.

The December mainnet launch will integrate these improvements into live Ethereum operations — and the community is watching closely to ensure testnet stability translates to mainnet performance.

🧠 Bigger Picture: Ethereum Reclaims Its Scaling Lead

The Fusaka upgrade reinforces Ethereum’s leadership in decentralized infrastructure just as competitors like Solana and Avalanche chase transaction speed through more centralized models.

By upgrading core validation mechanics rather than compromising decentralization, Ethereum continues to prove that scaling and security can coexist.

Fusaka’s modular efficiency also lays groundwork for Ethereum’s next wave of rollup integrations, cross-chain bridges, and AI-powered agents — all requiring bandwidth, reliability, and fast validation.

TL;DR

• 🧪 Ethereum’s Fusaka upgrade deployed on Sepolia
• 🚀 Mainnet launch expected December 2025
• ⛽ Block gas limit increased to 60 million
• 🧩 Introduces PeerDAS (EIP-7594) — validator data sampling for faster throughput
• 💡 Boosts scalability, transaction speed, and network resilience
• 🧱 Positions Ethereum as the benchmark for next-gen blockchain infrastructure