Composer update failure - laravel

Question

I understand there has been a number of solutions provided for this question but I can't seem to find an answer.After running composer update I am getting this error Problem 1. What could be the issue? Here is the "required" section for the composer.json file.
"require": {
"barryvdh/laravel-ide-helper": "~2.4",
"doctrine/dbal": "~2.8",
"dompdf/dompdf": "~0.8",
"filp/whoops": "~2.2",
"guzzlehttp/guzzle": "~6.3",
"guzzlehttp/psr7": "~1.4",
"illuminate/support": "^6.12",
"intervention/image": "~2.4",
"laracasts/utilities": "~2.1",
"laravel/framework": "~5.6",
"laravel/socialite": "~3.0",
"laravelcollective/html": "^6.0",
"league/flysystem-aws-s3-v3": "~1.0",
"maatwebsite/excel": "~2.1",
"maxhoffmann/parsedown-laravel": "dev-master",
"mcamara/laravel-localization": "~1.2",
"mews/purifier": "^2.1",
"milon/barcode": "~5.3",
"nitmedia/wkhtml2pdf": "dev-master",
"omnipay/common": "~3",
"omnipay/dummy": "~3",
"omnipay/paypal": "~3",
"omnipay/stripe": "3.1",
"php-http/curl-client": "^1.7",
"php-http/message": "^1.6",
"predis/predis": "~1.1",
"vinelab/http": "~1.5",
"laravel/tinker": "^1.0",
"stripe/stripe-php": "^6.43",
"paynow/php-sdk": "^1.0",
"berzel/paynow-php": "^1.1"
},
"require-dev": {
"phpunit/phpunit": "7.3.*",
"phpspec/phpspec": "5.0.*",
"fzaninotto/faker": "1.8.*",
"symfony/dom-crawler": "~3.0",
"symfony/css-selector": "~3.0"
},

Answer 1

One or many of your packages are looking for a different version of another / sub package. Not only does Laravel itself depend on a whole slew of different 3rd party packages, so do the packages you install. Keeping up to date on all of them is challenging.
If you look at the error reported:
Laracasts/utilities 2.1 requires illuminate/support ~5.0
It is telling you that this particular package you are trying to install (Laracasts utils) needs a v5 from illuminate/support. Most likely, if you are working with Laravel V6, you thus are likely pulling in an illuminate/support package of a different version than required.
Solution:
Either find an updated Laracast package that will accept a newer version of illuminate/support, or reduce Laravel to V5 (which will pull in an older version of support). Former is preferable :)