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Ethereum's core developers have tentatively scheduled the network's next major hard fork, dubbed Fusaka, for November 2025. This upgrade aims to enhance network efficiency and scalability by incorporating several Ethereum Improvement Proposals (EIPs). Following Fusaka, the subsequent upgrade, Glamsterdam, is already in the planning stages, with its feature set to be confirmed in August.
Key Takeaways
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The Fusaka hard fork is slated for early December 2025, preceding the Devconnect conference.
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Fusaka focuses on infrastructure improvements, including scalability and node resilience, without altering smart contracts.
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The Glamsterdam upgrade, planned for 2026, will introduce further significant changes.
Fusaka: Enhancing Efficiency and Scalability
The Fusaka upgrade is designed to refine Ethereum's core infrastructure, bundling 11 EIPs focused on improving scalability, node resilience, and overall efficiency. Unlike previous upgrades that introduced user-facing features, Fusaka's changes are primarily behind-the-scenes, ensuring compatibility with existing decentralized applications (DApps).
Key proposals within Fusaka include:
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EIP-7594 (PeerDAS): Introduces peer data availability sampling, allowing nodes to verify rollup data without downloading full blobs, thus reducing bandwidth and storage requirements.
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EIP-7825 (Spam Resistance Checks): Aims to make the network more resilient to malicious transaction spam.
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EIP-7935 (Default Block Gas Limit): Raises the default gas target to 60 million units, potentially increasing throughput.
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EIP-7951 (secp256r1 Precompile): Adds native support for the P-256 elliptic curve, enhancing compatibility with Web2 security standards and passkey wallets.
To facilitate faster testing and development, certain proposals like EIP-7907 and the EVM Object Format have been excluded from Fusaka.
The Road to Fusaka and Beyond
The development timeline for Fusaka is aggressive, with a devnet launched in July 2025, followed by public testnets in September and October. This accelerated cadence aligns with Ethereum's new semiannual upgrade cycle. Developers are working towards a mainnet activation in early November, strategically timed just before the Devconnect conference in Buenos Aires.
Glamsterdam: The Next Frontier
Even as Fusaka nears completion, attention is already turning to the Glamsterdam hard fork, expected in 2026. Discussions for Glamsterdam include potential block time reductions from 12 seconds to six seconds, which could effectively double transaction throughput. Other considerations involve further gas limit adjustments and support for the growing DeFi ecosystem.
Decisions regarding the specific features for Glamsterdam will be finalized during the upcoming AllCoreDevs – Execution meeting on August 1. This ongoing cycle of upgrades underscores Ethereum's commitment to continuous improvement and adaptation.
Sources
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How the Fusaka Upgrade Advances Ethereum’s Long-Term Roadmap in 2025, cointelegraph.com.
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