# Ethereum Istanbul Upgrade Announcement

DevFeed: [Ethereum Istanbul Upgrade Announcement](<https://devfeed.tech/articles/ethereum-istanbul-upgrade-announcement-16871.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2019/11/20/ethereum-istanbul-upgrade-announcement>)

Author: Hudson Jameson

Published: 2019-11-20T00:00:00Z

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>), [Blockchain](<https://devfeed.tech/topics/blockchain.md>), [Network](<https://devfeed.tech/topics/network.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [client](<https://devfeed.tech/topics/client.md>)

Tags: [announcement](<https://devfeed.tech/tags/announcement.md>), [blockchain](<https://devfeed.tech/tags/blockchain.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [network](<https://devfeed.tech/tags/network.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [protocol-announcements](<https://devfeed.tech/tags/protocol-announcements.md>), [scheduled](<https://devfeed.tech/tags/scheduled.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

This announcement states that the Ethereum network's Istanbul upgrade was scheduled for block 9,069,000, predicted for December 7, 2019, with the exact date subject to change. It explains that users should update their Ethereum clients and that unsupported clients could remain on the old chain after the upgrade.

## Source excerpt

The Ethereum network will be undergoing a scheduled upgrade at block number 9,069,000, which is predicted to occur on Saturday, December 7, 2019. The exact date is subject to change due to variable block times and timezones....