Composer дает ошибку «Your requirements could not be resolved to an installable set of packages»?

Using version ^2.1 for pbmedia/laravel-ffmpeg
./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
    - pbmedia/laravel-ffmpeg 2.1.0 requires php-ffmpeg/binary-driver dev-master -> no matching package found.
    - Installation request for pbmedia/laravel-ffmpeg ^2.1 -> satisfiable by pbmedia/laravel-ffmpeg[2.1.0, 2.1.1].
    - Conclusion: remove laravel/framework v5.5.40
    - Conclusion: don't install laravel/framework v5.5.40
    - pbmedia/laravel-ffmpeg 2.1.1 requires illuminate/log 5.6.* -> satisfiable by illuminate/log[v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.19, v5.6.2, v5.6.20, v5.6.21, v5.6.22, v5.6.23, v5.6.24, v5.6.3, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9].
    - don't install illuminate/log v5.6.0|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.1|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.10|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.11|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.12|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.13|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.14|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.15|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.16|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.17|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.19|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.2|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.20|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.21|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.22|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.23|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.24|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.3|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.4|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.5|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.6|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.7|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.8|don't install laravel/framework v5.5.40
    - don't install illuminate/log v5.6.9|don't install laravel/framework v5.5.40
    - Installation request for laravel/framework (locked at v5.5.40, required as 5.5.*) -> satisfiable by laravel/framework[v5.5.40].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
 - It's a private package and you forgot to add a custom repository to find it

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

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