Install fails in new 5.6 project

[Robert Cooper]

$ composer require beyondcode/laravel-self-diagnosis
Using version ^0.2.0 for beyondcode/laravel-self-diagnosis
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for beyondcode/laravel-self-diagnosis ^0.2.0 -> satisfiable by beyondcode/laravel-self-diagnosis[0.2.0].
    - Conclusion: remove vlucas/phpdotenv v2.4.0
    - Conclusion: don't install vlucas/phpdotenv v2.4.0
    - beyondcode/laravel-self-diagnosis 0.2.0 requires vlucas/phpdotenv ~2.5 -> satisfiable by vlucas/phpdotenv[2.5.x-dev, v2.5.0].
    - Can only install one of: vlucas/phpdotenv[2.5.x-dev, v2.4.0].
    - Can only install one of: vlucas/phpdotenv[v2.5.0, v2.4.0].
    - Installation request for vlucas/phpdotenv (locked at v2.4.0) -> satisfiable by vlucas/phpdotenv[v2.4.0].


Installation failed, reverting ./composer.json to its original content.

Can I give you any further info?

[Robert Cooper]

I'm thinking this indicates I've a package installed which requires vlucas/phpdotenv v2.4.0 and this is causing the problem?

[Marcel Pociot]

What does composer why vlucas/phpdotenv give you?

[Robert Cooper]

composer why vlucas/phpdotenv
laravel/framework  v5.6.26  requires  vlucas/phpdotenv (~2.2)

[Marcel Pociot]

Please do a composer update in order to pull in version 2.5 of phpdotenv.
Then you should be able to install this package.

[Robert Cooper]

There we go!

Good job, looks like you are all set up.

Sorry for the n00b issue!