For macOS users, if you installed yarn via brew, you can upgrade it using the below command:
brew upgrade yarn
On Linux, just run the below command at the terminal:
$ curl --compressed -o- -L https://yarnpkg.com/install.sh | bash
On Windows, upgrade with Chocolatey
choco upgrade yarn
Credits:
Added answers with the help of the below answers
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https://stackoverflow.com/a/54147594/842607
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https://stackoverflow.com/a/53710422/842607