Ethereum’s Fusaka Update: Paving the Way for 12,000 TPS Scalability by 2026

Ethereum’s Fusaka upgrade, a major milestone in the network’s journey toward greater scalability, will launch its initial public testnet on October 1, 2025, starting with Holesky. This event signals the start of a staged deployment across testnets, leading up to the mainnet release on December 3, 2025. The update will set a new default gas limit of 60 million—double the current 30 million—and will introduce Peer Data Availability Sampling (PeerDAS) to boost data throughput and lower rollup costs Ethereum Fusaka Upgrade Targets Dec 3 Mainnet Launch [ 1 ]. The timeline was confirmed by developers during the ACDC 165 meeting, with Sepolia and Hoodi testnets scheduled for October 16 and October 30, respectively, following Holesky Ethereum Sets Fusaka Upgrade Timeline: Testnets in October, … [ 2 ].

Increasing the gas limit is central to Fusaka’s scalability ambitions. By raising the block gas ceiling to 150 million,

aims to achieve a fourfold increase in transaction capacity, resulting in quicker processing and reduced fees. Early trials on Devnet-5 revealed that blob capacity doubled within two weeks of implementation, highlighting the upgrade’s promise for supporting Layer 2 technologies Ethereum Fusaka Upgrade Targets Dec 3 Mainnet Launch [ 1 ]. PeerDAS further streamlines resource management by enabling validators to sample data from peers rather than downloading full datasets, making validation more efficient and boosting network performance Countdown to Fusaka: Ethereum Locks Dates for … [ 3 ].

The phased testnet rollout is designed to ensure thorough validation and minimize risk. Holesky, despite its planned retirement, was selected as the first testnet to rigorously test peer sampling mechanisms Ethereum Fusaka Upgrade Timeline On Testnets [ 4 ]. Sepolia and Hoodi will follow, each acting as a checkpoint for identifying bugs and optimizing performance before the mainnet goes live. Activations are scheduled mid-week (such as October 2 for Holesky) to coordinate with developer meetings and avoid scheduling conflicts Ethereum Fusaka Upgrade Timeline On Testnets [ 4 ].

Fusaka’s technical improvements go beyond just gas limits and data handling. The upgrade will also introduce Verkle Trees for more compact proofs, better EVM efficiency, and an increased smart contract code size limit (from 24KB to 48KB). These enhancements are expected to give developers the tools to create more advanced decentralized applications while preserving decentralization Ethereum Fusaka Upgrade Targets Dec 3 Mainnet Launch [ 1 ]. Experts predict that by 2026, PeerDAS could allow Ethereum to handle up to 12,000 transactions per second, putting it on par with centralized platforms in terms of throughput Countdown to Fusaka: Ethereum Locks Dates for … [ 3 ].

Following the mainnet launch on December 3, the Glamsterdam upgrade is expected in 2026, focusing on further scalability improvements like the full EVM Object Format (EOF) and faster block production Ethereum Fusaka Upgrade Targets Dec 3 Mainnet Launch [ 1 ]. Developers emphasize that this multi-phase strategy allows for comprehensive testing, with each testnet phase offering vital feedback for mainnet reliability. For end users, the transition will be mostly automatic, as wallets and exchanges will update in the background. However, validators and node operators must update their clients to avoid penalties Countdown to Fusaka: Ethereum Locks Dates for … [ 3 ].

The Fusaka upgrade is a significant leap forward for Ethereum’s technical foundation, focusing on behind-the-scenes enhancements rather than user-facing features. This approach sets the stage for a more scalable and robust blockchain network. As the testnets go live in the coming weeks, the community will closely track performance data to assess the upgrade’s impact on Ethereum’s future in decentralized finance and enterprise solutions Ethereum Fusaka Upgrade Targets Dec 3 Mainnet Launch [ 1 ].