# London Testnets Announcement

DevFeed: [London Testnets Announcement](<https://devfeed.tech/articles/london-testnets-announcement-16967.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2021/06/18/london-testnets-announcement>)

Author: Tim Beiko

Published: 2021-06-18T00:00:00Z

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>), [Network](<https://devfeed.tech/topics/network.md>)

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

## AI overview

The article announces that the London upgrade is ready for deployment on Ethereum testnets, beginning with Ropsten around June 24, 2021. It describes compatibility changes, required client upgrades, the testnet rollout schedule, and the later transition plan for OpenEthereum.

## Source excerpt

The long-anticipated London upgrade is now ready for deployement on the Ethereum testnets! The upgrade will first go live on Ropsten, at block 10499401, which is expected to happen around June 24, 2021. This upgrade follows Berlin, which was activated only a few months ago on the Ethereum mainnet....