无法安装dm-kit

max系统
7.3.5的php版本
Laravel框架。
问题：
composer require baidu-chelianwang/dm-kit
提示
Problem 1
- Installation request for baidu-chelianwang/dm-kit ^0.1.1 -> satisfiable by baidu-chelianwang/dm-kit[V0.1.1].
- baidu-chelianwang/dm-kit V0.1.1 requires symfony/yaml 2.8.45 -> satisfiable by symfony/yaml[v2.8.45] but these conflict with your requirements or minimum-stability.
yaml官方已经没有了2.8.45这个版本。目前是4.3

Start by reproducing the `composer require baidu-chelianwang/dm-kit` failure in the reported PHP and Laravel environment, then inspect the package dependency declaration that requires `symfony/yaml` 2.8.45. Done means the package can be installed with an available compatible YAML dependency and the reported conflict is resolved.

Written by the indexing model from the issue text.