Arbitrum is preparing to roll out a major protocol upgrade. The network is introducing ArbOS Dia, a new operating system update designed to improve gas fee predictability, unlock higher throughput, and modernize authentication for both mobile users and enterprises. The upgrade is planned for early January 2026, according to Arbitrum’s announcement. It marks one of the most comprehensive changes to the Arbitrum stack since Nitro, touching pricing mechanics, execution performance, onboarding flows, and Ethereum compatibility. At a time when Layer 2 networks are competing on cost, speed, and usability, ArbOS Dia targets all three. The goal is simple. Make Arbitrum
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