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Instead of caching node_modules try to manage the Yarn cache: variables: YARN_CACHE_FOLDER: './yarn_cache/' ... cache: paths: - '$YARN_CACHE_FOLDER'

Temporarily rename the package.json file, and then install the required version. mv package.json package.json.old yarn set version berry mv package.json.old package.json

You don't need corepack. I'm at a loss for words why this works the way it is, but this is how I do it with version 4: mv package.json package.json.old yarn set version berry mv package.json.old ...

So, I thought the time-out advice in Yarn - There appears to be trouble with your network connection. Retrying was not working for me. I had to increase the time out tag from --network-timeout 100000 ...