Network upgrades

PUBLIC PREVIEW DOCUMENT

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This page has information on the state and timelines of major software updates to Arbitrum One and Arbitrum Nova. Software updates that alter an Arbitrum chain's ability to produce valid Arbitrum blocks are referred to as ArbOS upgrades and, as outlined in the Arbitrum DAO Constitution, will always require a Constiutional AIP to pass for DAO-governed chains.

Visit Inside Arbitrum Nitro to learn more about Nitro's architecture; more information about ArbOS software releases is available on the Arbitrum DAO forum as well as in the documentation for the overview of ArbOS software releases.

Network activation statuses

Upgrade	Governance Approval Status	Link to most recent governance stage	Arbitrum Sepolia (YYYY-MM-DD)	Arbitrum One (YYYY-MM-DD)	Arbitrum Nova (YYYY-MM-DD)
ArbOS 31 Bianca	Passed Temperature Check Vote	Temperature check results on Snapshot: Activating Stylus, Nova Fee Router AIP, & Adding RIP-7212 for Account Abstraction Wallets	Mon, 2024-06-17 at 17:00:00 UTC	Coming soon!	Coming soon!
ArbOS 20 Atlas	Approved & executed	On-chain Tally vote	Thu, 2024-02-29 at 18:00:00 UTC	Thu, 2024-03-14 01:48:09 PM UTC	Thu, 2024-03-14 01:48:09 PM UTC
ArbOS 11	Approved & executed	On-chain Tally vote	Tues, 2024-01-30 at 17:00:00 UTC	Thu, 2024-02-24 at 20:01:13 UTC	Thu, 2024-02-24 at 20:01:13 UTC

Stay up to date

To stay up to date with proposals, timelines, and statuses of network upgrades to Arbitrum One and Nova:

• Subscribe to the Arbitrum Node Upgrade Announcement channel on Telegram
• Join both the #dev-announcements and #node-runners Discord channels in the Arbitrum Discord server
• Follow the official Arbitrum (@Arbitrum) and Arbitrum Developers (@ArbitrumDevs) X accounts, formerly Twitter.