# Altair Mainnet Announcement

DevFeed: [Altair Mainnet Announcement](<https://devfeed.tech/articles/altair-mainnet-announcement-16981.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2021/10/05/altair-announcement>)

Author: Danny Ryan

Published: 2021-10-05T00:00:00Z

Content type: release

Language: en

Sources: [Ethereum Foundation Blog](<https://devfeed.tech/sources/ethereum-foundation-blog.md>)

Topics: [Ethereum](<https://devfeed.tech/topics/ethereum.md>), [releases](<https://devfeed.tech/topics/releases.md>), [Security](<https://devfeed.tech/topics/security.md>), [Bug Bounty](<https://devfeed.tech/topics/bugbounty.md>)

Tags: [announcement](<https://devfeed.tech/tags/announcement.md>), [bug-bounty](<https://devfeed.tech/tags/bug-bounty.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [protocol-announcements](<https://devfeed.tech/tags/protocol-announcements.md>), [release](<https://devfeed.tech/tags/release.md>), [releases](<https://devfeed.tech/tags/releases.md>), [security](<https://devfeed.tech/tags/security.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

The Altair beacon chain upgrade is scheduled for activation on the Ethereum mainnet at epoch 74240 on October 27, 2021. Beacon node operators and validators must update their clients to remain on the upgraded chain. The announcement also doubles vulnerability bounties for Altair-related issues for four weeks after launch.

## Source excerpt

The Altair beacon chain upgrade is ready to be activated on the Ethereum mainnet. The upgrade will go live at epoch 74240 (Oct 27, 2021, 10:56:23am UTC)....