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

[logue]

The framework (Laravel) used in my project can not be installed because it requires a new version of sebastian/diff.
Can you change the definition of composer.json or support the latest version?

  Problem 1
    - Installation request for bircher/php-merge ^2.0 -> satisfiable by bircher/php-merge[2.0.0].
    - Conclusion: remove sebastian/diff 3.0.1
    - Conclusion: don't install sebastian/diff 3.0.1
    - bircher/php-merge 2.0.0 requires sebastian/diff ^1.3 -> satisfiable by sebastian/diff[1.3.0, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.x-dev].
    - Can only install one of: sebastian/diff[1.3.0, 3.0.1].
    - Can only install one of: sebastian/diff[1.4.0, 3.0.1].
    - Can only install one of: sebastian/diff[1.4.1, 3.0.1].
    - Can only install one of: sebastian/diff[1.4.2, 3.0.1].
    - Can only install one of: sebastian/diff[1.4.3, 3.0.1].
    - Can only install one of: sebastian/diff[1.4.x-dev, 3.0.1].
    - Installation request for sebastian/diff (locked at 3.0.1) -> satisfiable by sebastian/diff[3.0.1].

[bircher]

I just tagged 2.1.0 and 3.0.0 which should both be compatible with your other dependencies.