在创建项目时出错 ，这是什么原因？求助Your requirements could not be resolved to an installable set of packages.

[root@localhost wwwroot]# composer create-project laravel/laravel next.phplar.com 5.1.4
Installing laravel/laravel (v5.1.4)
- Installing laravel/laravel (v5.1.4)
Loading from cache

Created project in next.phplar.com
Loading composer repositories with package information
Installing dependencies (including require-dev)

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

Problem 1
- This package requires php >=5.5.9 but your PHP version (5.4.41) does not satisfy that requirement.
Problem 2
- laravel/framework v5.1.5 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- laravel/framework v5.1.4 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- laravel/framework v5.1.3 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- laravel/framework v5.1.2 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- laravel/framework v5.1.1 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- laravel/framework v5.1.0 requires php >=5.5.9 -> your PHP version (5.4.41) does not satisfy that requirement.
- Installation request for laravel/framework 5.1.* -> satisfiable by laravel/framework[v5.1.0, v5.1.1, v5.1.2, v5.1.3, v5.1.4, v5.1.5].

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在创建项目时出错 ，这是什么原因？求助