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The Ethereum Pectra hard fork was activated on the Ethereum mainnet on May 7, 2025, at epoch 364032 and the ArbOS 40 upgrade on Arbitrum was specifically designed to align the Layer-2 network with this mainnet protocol upgrade
Ethereum’s Pectra upgrade has been activated on Arbitrum through the deployment of ArbOS 40, marking a major milestone in extending Ethereum’s protocol advancements to its leading Layer-2 network
The upgrade enables multiple Ethereum Pectra hard fork features, specifically for account abstraction, BLS cryptographic precompiles, accessing historical block hashes and a minor Stylus fix
The ArbOS 40 “Callisto” upgrade integrates Ethereum’s Pectra features into Arbitrum and is now active on both Arbitrum One and Nova, introducing advanced primitives for account abstraction, zero-knowledge tooling, and enhanced developer experience across Ethereum’s largest Layer-2 ecosystem

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