When i try to run "composer update" i am getting following errors.

PHP 7.1.20

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for magento/product-community-edition 2.3.0 -> satisfiable by magento/product-community-edition[2.3.0].
    - magento/product-community-edition 2.3.0 requires colinmollenhour/cache-backend-file ~1.4.1 -> satisfiable by colinmollenhour/cache-backend-file[v1.4.1, v1.4.2, v1.4.3, v1.4.4] but these conflict with your requirements or minimum-stability.

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