How to downgrade or install a specific version of Composer?

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If you already installed composer and if you want to change the composer version the use below command.

composer self-update --1

When you want to go back to version 2 (which you should, after updating or removing the incompatible plugins):

composer self-update --2

The above will take you to the latest on any of the two major versions.

You can also “update” to a specific version just by passing the version number to self-update:

composer self-update 1.10.12
composer self-update 2.0.7

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