عدم آپدیت ورژن ۵.۸.۳۶ به ۶

سلام
در آپدیت ورژن ورژن 5.8.36 به 6 به نسخه php ایراد میگیره
با این ارور

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

Problem 1

- This package requires php ^7.2 but your PHP version (7.1.23) does not satisfy that requirement.  
  Problem 2
- Installation request for laravel/framework 6.0.0 -> satisfiable by laravel/framework\[v6.0.0\].
- laravel/framework v6.0.0 requires php ^7.2 -> your PHP version (7.1.23) does not satisfy that requirement.

تمام راه هایی رو که در استک اورفلو گفته شد رو تست کردم
حل نشد
روی سیستم مک کار میکنم
نمیدونم مشکل از اون ممکنه باشه
ورژن php زمپم هم روی 7.3 هست
توی composer.json
اینا رو دارم

{  
"name": "laravel/laravel",  
"description": "The Laravel Framework.",  
"keywords": \["framework", "laravel"\],  
"license": "MIT",  
"type": "project",  
"require": {  
"php": "7.3.9",  
"anam/captcha": "^1.0",  
"anhskohbo/no-captcha": "^3.1",  
"fideloper/proxy": "^4.0",  
"laravel/framework": "6.0.0",  
"laravel/passport": "^7.0",  
"laravel/tinker": "~1.0",  
"laravelcollective/html": "^5.4.0",  
"paragonie/random\_compat": "2.\",
"saeedpooyanfar/zarinpal": "^3.0",
"uxweb/sweet-alert": "^2.0",
"kylekatarnls/laravel-carbon-2": "^1.0.0",
"nesbot/carbon": "2.27.0 as 1.39.0"
},
"require-dev": {
"filp/whoops": "~2.0",
"fzaninotto/faker": "~1.4",
"mockery/mockery": "0.9.",
"phpunit/phpunit": "~7.0"
},
"autoload": {
"classmap": [
    "database/seeds",
    "database/factories"
],
"psr-4": {
    "App\\": "app/"
},
"files": ["app/Helpers/seo.php"]

},
"autoload-dev": {
"psr-4": {
    "Tests\\": "tests/"
}
},
"extra": {
"laravel": {
    "dont-discover": [
    ]
}
},
"scripts": {
"post-root-package-install": [
    "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
    "@php artisan key:generate"
],
"post-autoload-dump": [
    "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
    "@php artisan package:discover"
]
},
"config": {

"preferred-install": "dist",
"sort-packages": true,
"optimize-autoloader": true
}
}

خواهشا کمک کنید 5 روزه گرفتار حل مشکلم