# Checkpoint #4: Berlinterop

DevFeed: [Checkpoint #4: Berlinterop](<https://devfeed.tech/articles/checkpoint-4-berlinterop-17168.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2025/06/19/checkpoint-4>)

Author: Nixo Rokish

Published: 2025-06-19T00:00:00Z

Content type: news

Language: en

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

Topics: [Ethereum](<https://devfeed.tech/topics/ethereum.md>), [Development](<https://devfeed.tech/topics/development.md>), [Network](<https://devfeed.tech/topics/network.md>), [Testing](<https://devfeed.tech/topics/testing.md>)

Tags: [blockchain](<https://devfeed.tech/tags/blockchain.md>), [consensus](<https://devfeed.tech/tags/consensus.md>), [development](<https://devfeed.tech/tags/development.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [github](<https://devfeed.tech/tags/github.md>), [hardening](<https://devfeed.tech/tags/hardening.md>), [network](<https://devfeed.tech/tags/network.md>), [research-development](<https://devfeed.tech/tags/research-development.md>), [stress](<https://devfeed.tech/tags/stress.md>), [testing](<https://devfeed.tech/tags/testing.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

Ethereum's Checkpoint #4 reports on Berlinterop, an interop hacking week where core developers and researchers worked on Fusaka implementation, devnet progress, gas-limit increases, and longer-term research directions. The article also describes stress testing and plans to consult the public governance process before finalizing changes.

## Source excerpt

Ethereum's weekly All Core Developer calls are a lot to keep up with, so this "Checkpoint" series aims for high-level updates depending on what's happening in core development. See the previous update here. This is a special edition of the series! Kicking off Berlin Blockchain Week, ethereum core...