Laravel Composer更新没有'；t通过

我使用Laravel 5.0，我需要使用maatewebsite/excel来完成我的工作，但之后，我更新了Composer，我出现了以下错误：

 Problem 1
    - Conclusion: remove laravel/framework v5.0.35
    - Conclusion: don't install laravel/framework v5.0.35
    - Conclusion: don't install laravel/framework v5.0.34
    - Conclusion: don't install laravel/framework v5.0.33
    - Conclusion: don't install laravel/framework v5.0.32
    - Conclusion: don't install laravel/framework v5.0.31
    - Conclusion: don't install laravel/framework 5.0.30
    - Conclusion: don't install laravel/framework v5.0.29
    - Conclusion: don't install laravel/framework v5.0.28
    - Conclusion: don't install laravel/framework v5.0.27
    - Conclusion: don't install laravel/framework v5.0.26
    - Conclusion: don't install laravel/framework v5.0.25
    - Conclusion: don't install laravel/framework v5.0.24
    - Conclusion: don't install laravel/framework v5.0.23
    - Conclusion: don't install laravel/framework v5.0.22
    - Conclusion: don't install laravel/framework v5.0.21
    - Conclusion: don't install laravel/framework v5.0.20
    - Conclusion: don't install laravel/framework v5.0.19
    - Conclusion: don't install laravel/framework v5.0.18
    - Conclusion: don't install laravel/framework v5.0.17
    - Conclusion: don't install laravel/framework v5.0.16
    - Conclusion: don't install laravel/framework v5.0.15
    - Conclusion: don't install laravel/framework v5.0.14
    - Conclusion: don't install laravel/framework v5.0.13
    - Conclusion: don't install laravel/framework v5.0.12
    - Conclusion: don't install laravel/framework v5.0.11
    - Conclusion: don't install laravel/framework v5.0.10
    - Conclusion: don't install laravel/framework v5.0.9
    - Conclusion: don't install laravel/framework v5.0.8
    - Conclusion: don't install laravel/framework v5.0.7
    - Conclusion: don't install laravel/framework v5.0.6
    - Conclusion: don't install laravel/framework v5.0.5
    - Conclusion: don't install laravel/framework v5.0.4
    - Conclusion: don't install laravel/framework v5.0.3
    - Conclusion: don't install laravel/framework v5.0.2
    - Conclusion: don't install laravel/framework v5.0.1
    - laravelcollective/html v5.2 requires illuminate/view 5.2.* -> satisfiable by illuminate/view[v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.6, v5.2.7].
    - laravelcollective/html v5.2.1 requires illuminate/view 5.2.* -> satisfiable by illuminate/view[v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.6, v5.2.7].
    - laravelcollective/html v5.2.2 requires illuminate/view 5.2.* -> satisfiable by illuminate/view[v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.6, v5.2.7].
    - laravelcollective/html v5.2.3 requires illuminate/view 5.2.* -> satisfiable by illuminate/view[v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.6, v5.2.7].
    - laravelcollective/html v5.2.4 requires illuminate/view 5.2.* -> satisfiable by illuminate/view[v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.6, v5.2.7].
    - don't install illuminate/view v5.2.0|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.19|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.21|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.24|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.25|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.26|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.27|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.28|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.31|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.6|don't install laravel/framework v5.0.0
    - don't install illuminate/view v5.2.7|don't install laravel/framework v5.0.0
    - Installation request for laravel/framework 5.0.* -> satisfiable by laravel/framework[5.0.30, v5.0.0, v5.0.1, v5.0.10, v5.0.11, v5.0.12, v5.0.13, v5.0.14, v5.0.15, v5.0.16, v5.0.17, v5.0.18, v5.0.19, v5.0.2, v5.0.20, v5.0.21, v5.0.22, v5.0.23, v5.0.24, v5.0.25, v5.0.26, v5.0.27, v5.0.28, v5.0.29, v5.0.3, v5.0.31, v5.0.32, v5.0.33, v5.0.34, v5.0.35, v5.0.4, v5.0.5, v5.0.6, v5.0.7, v5.0.8, v5.0.9].
    - Installation request for laravelcollective/html 5.2.* -> satisfiable by laravelcollective/html[v5.2, v5.2.1, v5.2.2, v5.2.3, v5.2.4].

我的composer.json:

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "laravel/framework": "5.0.*",
        "illuminate/html": "5.*",
        "laravelcollective/html": "5.2.*",
        "maatwebsite/excel": "~2.1.0"
    },
    "require-dev": {
        "phpunit/phpunit": "~4.0",
        "phpspec/phpspec": "~2.1"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App''": "app/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-install-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "post-create-project-cmd": [
            "php -r '"copy('.env.example', '.env');'"",
            "php artisan key:generate"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

我该怎么处理我的Laravel？