我正在安装这个https://github.com/antonioribeiro/tracker使用以下命令在my Laravel 5.2上安装软件包：

composer require pragmarx/tracker

但是我得到了这个错误：

无法将您的需求解析为可安装的软件包集。

Using version ^2.0 for pragmarx/tracker
./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 pragmarx/tracker ^2.0 -> satisfiable by pragmarx/tracker[v2.0.0].
    - Conclusion: remove ramsey/uuid 3.4.1
    - Conclusion: don't install ramsey/uuid 3.4.1
    - pragmarx/tracker v2.0.0 requires ramsey/uuid ~2.8 -> satisfiable by ramsey/uuid[2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.9.0].
    - Can only install one of: ramsey/uuid[2.8.0, 3.4.1].
    - Can only install one of: ramsey/uuid[2.8.1, 3.4.1].
    - Can only install one of: ramsey/uuid[2.8.2, 3.4.1].
    - Can only install one of: ramsey/uuid[2.8.3, 3.4.1].
    - Can only install one of: ramsey/uuid[2.8.4, 3.4.1].
    - Can only install one of: ramsey/uuid[2.9.0, 3.4.1].
    - Installation request for ramsey/uuid (locked at 3.4.1) -> satisfiable by ramsey/uuid[3.4.1].


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

我不想破坏我的申请。那我该怎么办？