Network upgrades
This document is currently in public preview and may change significantly as feedback is captured from readers like you. Click the Request an update button at the top of this document or join the Arbitrum Discord to share your feedback.
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 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-announcementsand#node-runnersDiscord channels in the Arbitrum Discord server - Follow the official Arbitrum (
@Arbitrum) and Arbitrum Developers (@ArbitrumDevs) X accounts, formerly Twitter.