Can't install with Laravel 5.2

[ChristianGiupponi]

I tried to install the package with Laravel 5.2.

here is my composer.json file:

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "laracasts/flash": "^2.0",
        "pingpong/modules": "~2.0",
        "pingpong/themes": "~2.0"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~4.0",
        "symfony/css-selector": "2.8.*|3.0.*",
        "symfony/dom-crawler": "2.8.*|3.0.*",
        "barryvdh/laravel-ide-helper": "~2",
        "barryvdh/laravel-debugbar": "~2.0"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/",
            "Modules\\": "modules/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "pre-update-cmd": [
            "php artisan clear-compiled"
        ],
        "post-update-cmd": [
            "php artisan ide-helper:generate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

Here the output of composer update:

> php artisan clear-compiled
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
    - Conclusion: remove laravel/framework v5.2.23
    - Conclusion: don't install laravel/framework v5.2.23
    - Conclusion: don't install laravel/framework v5.2.22
    - Conclusion: don't install laravel/framework v5.2.21
    - Conclusion: don't install laravel/framework v5.2.20
    - Conclusion: don't install laravel/framework v5.2.19
    - Conclusion: don't install laravel/framework v5.2.18
    - Conclusion: don't install laravel/framework v5.2.17
    - Conclusion: don't install laravel/framework v5.2.16
    - Conclusion: don't install laravel/framework v5.2.15
    - Conclusion: don't install laravel/framework v5.2.14
    - Conclusion: don't install laravel/framework v5.2.13
    - Conclusion: don't install laravel/framework v5.2.12
    - Conclusion: don't install laravel/framework v5.2.11
    - Conclusion: don't install laravel/framework v5.2.10
    - Conclusion: don't install laravel/framework v5.2.9
    - Conclusion: don't install laravel/framework v5.2.8
    - Conclusion: don't install laravel/framework v5.2.7
    - Conclusion: don't install laravel/framework v5.2.6
    - Conclusion: don't install laravel/framework v5.2.5
    - Conclusion: don't install laravel/framework v5.2.4
    - Conclusion: don't install laravel/framework v5.2.3
    - Conclusion: don't install laravel/framework v5.2.2
    - Conclusion: don't install laravel/framework v5.2.1
    - pingpong/themes 2.0.0 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes 2.0.10 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes 2.0.15 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes 2.0.20 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes 2.0.21 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes 2.0.5 requires illuminate/config 5.0.* -> satisfiable by illuminate/config[v5.0.0, v5.0.22, v5.0.25, v5.0.26, v5.0.28, v5.0.33, v5.0.4].
    - pingpong/themes v2.1.0 requires illuminate/config 5.1.* -> satisfiable by illuminate/config[v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.6, v5.1.8].
    - pingpong/themes v2.1.4 requires illuminate/config 5.1.* -> satisfiable by illuminate/config[v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.6, v5.1.8].
    - pingpong/themes v2.1.5 requires illuminate/config 5.1.* -> satisfiable by illuminate/config[v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.6, v5.1.8].
    - pingpong/themes v2.1.6 requires illuminate/config 5.1.* -> satisfiable by illuminate/config[v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.6, v5.1.8].
    - pingpong/themes v2.1.7 requires illuminate/config 5.1.* -> satisfiable by illuminate/config[v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.6, v5.1.8].
    - don't install illuminate/config v5.0.0|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.22|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.25|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.26|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.28|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.33|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.0.4|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.1|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.13|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.16|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.2|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.20|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.22|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.25|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.28|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.30|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.31|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.6|don't install laravel/framework v5.2.0
    - don't install illuminate/config v5.1.8|don't install laravel/framework v5.2.0
    - Installation request for laravel/framework 5.2.* -> satisfiable by laravel/framework[v5.2.0, v5.2.1, v5.2.10, v5.2.11, v5.2.12, v5.2.13, v5.2.14, v5.2.15, v5.2.16, v5.2.17, v5.2.18, v5.2.19, v5.2.2, v5.2.20, v5.2.21, v5.2.22, v5.2.23, v5.2.3, v5.2.4, v5.2.5, v5.2.6, v5.2.7, v5.2.8, v5.2.9].
    - Installation request for pingpong/themes ~2.0 -> satisfiable by pingpong/themes[2.0.0, 2.0.10, 2.0.15, 2.0.20, 2.0.21, 2.0.5, v2.1.0, v2.1.4, v2.1.5, v2.1.6, v2.1.7].

[semsphy]

Workaround, modify your composer.json

"pingpong/themes":"dev-master as 2.2-dev"
composer update