how to upgrade version of composer

Question

I was trying to require a package using composer require command, and I faced following error

Some Symfony Flex features may not work as expected: your version of Composer is too old Please upgrade using https://getcomposer.org/

I visited mentioned website for upgrading, but I couldn't find anything about updating composer.

How can I update composer?

I am using Linux Mint 18.3.

Answer 1

Use this command to update the version of composer:

composer self-update