[FIXED] Composer update error when updating laravel 6 -> 8

Issue

I'm trying to update my Laravel version from 6 -> 8 by following this guide https://laravel.com/docs/8.x/upgrade

I'm not sure if I should update to Laravel 7 first, then to 8, never the less, I face the same composer problem when trying to update to 7.

composer update output:

        Problem 1
        - illuminate/database 5.7.17 requires illuminate/support 5.7.* -> satisfiable by laravel/framework[5.7.x-dev], illuminate/support[5.7.17, 5.7.18, 5.7.19, 5.7.x-dev, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.28, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9].
        - illuminate/database v5.4.9 requires nesbot/carbon ~1.20 -> satisfiable by nesbot/carbon[1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.24.1, 1.24.2, 1.25.0, 1.25.1, 1.25.3, 1.26.0, 
    1.26.1, 1.26.2, 1.26.3, 1.26.4, 1.26.5, 1.26.6, 1.27.0, 1.28.0, 1.29.0, 1.29.1, 1.29.2, 1.30.0, 1.31.0, 1.31.1, 1.32.0, 1.33.0, 1.34.0, 1.34.1, 1.34.2, 1.34.3, 1.34.4, 1.35.0, 1.35.1, 1.36.0, 1.36.1, 1.36.2, 1.37.0, 1.37.1, 1.38.0, 1.38.1, 1.38.2, 1.38.3, 1.38.4, 1.39.0, 1.39.1] but these conflict with your requirements or minimum-stability.
     - Conclusion: don't install laravel/framework v7.28.4
     - Installation request for roave/security-advisories dev-master -> satisfiable by roave/security-advisories[dev-master].
      - silber/bouncer v1.0.0-rc.6 requires illuminate/database 5.1.20 - 5.8|^6.0 -> satisfiable by laravel/framework[v6.7.0, 5.1.x-dev, 5.2.x-dev, 5.3.x-dev, 5.4.x-dev, 5.5.x-dev, 5.6.x-dev, 
5.7.x-dev, 5.8.x-dev, 6.x-dev], illuminate/database[5.1.x-dev, 5.2.x-dev, 5.3.x-dev, 5.4.x-dev, 5.5.x-dev, 5.6.x-dev, 5.7.17, 5.7.18, 5.7.19, 5.7.x-dev, 5.8.x-dev, 6.x-dev, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.41, 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, v5.2.32, v5.2.37, v5.2.43, v5.2.45, v5.2.6, v5.2.7, v5.3.0, v5.3.16, v5.3.23, v5.3.4, v5.4.0, v5.4.13, v5.4.17, v5.4.19, v5.4.27, v5.4.36, v5.4.9, v5.5.0, v5.5.16, v5.5.17, v5.5.2, v5.5.28, v5.5.33, v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.39, v5.5.40, v5.5.41, v5.5.43, v5.5.44, v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.19, v5.6.2, v5.6.20, v5.6.21, v5.6.22, v5.6.23, v5.6.24, v5.6.25, v5.6.26, v5.6.27, v5.6.28, v5.6.29, v5.6.3, v5.6.30, v5.6.31, v5.6.32, v5.6.33, v5.6.34, v5.6.35, v5.6.36, v5.6.37, v5.6.38, v5.6.39, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.28, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9, v5.8.0, v5.8.11, v5.8.12, v5.8.14, v5.8.15, v5.8.17, v5.8.18, v5.8.19, v5.8.2, v5.8.20, v5.8.22, v5.8.24, v5.8.27, v5.8.28, v5.8.29, v5.8.3, v5.8.30, v5.8.31, v5.8.32, v5.8.33, v5.8.34, v5.8.35, v5.8.36, v5.8.4, v5.8.8, v5.8.9, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.10.0, v6.11.0, v6.12.0, v6.13.0, v6.13.1, v6.14.0, v6.15.0, v6.15.1, v6.16.0, v6.17.0, v6.17.1, v6.18.0, v6.18.1, v6.18.10, v6.18.11, 
v6.18.12, v6.18.13, v6.18.14, v6.18.15, v6.18.16, v6.18.17, v6.18.18, v6.18.19, v6.18.2, v6.18.20, v6.18.21, v6.18.22, v6.18.23, v6.18.24, v6.18.25, v6.18.26, v6.18.27, v6.18.28, v6.18.29, v6.18.3, v6.18.30, v6.18.31, v6.18.32, v6.18.33, v6.18.34, v6.18.35, v6.18.36, v6.18.37, v6.18.38, v6.18.39, v6.18.4, v6.18.40, v6.18.41, v6.18.42, v6.18.5, v6.18.6, v6.18.7, v6.18.8, v6.18.9, v6.2.0, v6.3.0, v6.4.1, v6.5.0, v6.5.1, v6.5.2, v6.6.0, v6.6.1, v6.6.2, v6.7.0, v6.8.0].
 - Can only install one of: laravel/framework[7.x-dev, 5.8.x-dev].
 - don't install illuminate/database 5.8.x-dev|don't install laravel/framework 7.x-dev
 - Installation request for laravel/framework ^7.0 -> satisfiable by laravel/framework[7.x-dev, v7.0.0, v7.0.1, v7.0.2, v7.0.3, v7.0.4, v7.0.5, v7.0.6, v7.0.7, v7.0.8, v7.1.0, v7.1.1, v7.1.2, v7.1.3, v7.10.0, v7.10.1, v7.10.2, v7.10.3, v7.11.0, v7.12.0, v7.13.0, v7.14.0, v7.14.1, v7.15.0, v7.16.0, v7.16.1, v7.17.0, v7.17.1, v7.17.2, v7.18.0, v7.19.0, v7.19.1, v7.2.0, v7.2.1, v7.2.2, v7.20.0, v7.21.0, v7.22.0, v7.22.1, v7.22.2, v7.22.3, v7.22.4, v7.23.0, v7.23.1, v7.23.2, v7.24.0, v7.25.0, v7.26.0, v7.26.1, v7.27.0, v7.28.0, v7.28.1, v7.28.2, v7.28.3, v7.28.4, v7.3.0, v7.4.0, v7.5.0, v7.5.1, v7.5.2, v7.6.0, v7.6.1, v7.6.2, v7.7.0, v7.7.1, v7.8.0, v7.8.1, v7.9.0, v7.9.1, v7.9.2].
    - Installation request for silber/bouncer v1.0.0-rc.6 -> satisfiable by silber/bouncer[v1.0.0-rc.6].

composer.json require:

    "require": {
    "php": "^7.2",
    "ext-curl": "*",
    "ext-pdo": "*",
    "bugsnag/bugsnag-laravel": "^2.17",
    "doctrine/dbal": "2.9.3",
    "felixkiss/uniquewith-validator": "^3.1",
    "fideloper/proxy": "^4.0",
    "firebase/php-jwt": "^5.2",
    "lab404/laravel-impersonate": "^1.2",
    "laravel/framework": "^7.0",
    "laravel/helpers": "^1.1",
    "laravel/passport": "^8.0.1",
    "laravel/socialite": "^4.3",
    "laravel/tinker": "^2.0",
    "laravelcollective/html": "^6.0.3",
    "league/flysystem-aws-s3-v3": "^1.0",
    "league/flysystem-cached-adapter": "^1.0",
    "maatwebsite/excel": "^3.1",
    "moontoast/math": "^1.2",
    "mpociot/laravel-apidoc-generator": "^3.10",
    "mpociot/laravel-test-factory-helper": "^1.2",
    "nesbot/carbon": "^2.27",
    "nicolaslopezj/searchable": "^1.12",
    "pdfcrowd/pdfcrowd": "^4.3",
    "predis/predis": "^1.1",
    "ramsey/uuid-doctrine": "^1.6",
    "silber/bouncer": "v1.0.0-rc.6",
    "socialiteproviders/apple": "^3.0",
    "spatie/geocoder": "^3.6",
    "spatie/laravel-json-api-paginate": "^1.6",
    "spatie/laravel-sitemap": "^5.7",
    "twilio/sdk": "^5.18",
    "vimeo/vimeo-api": "^3.0",
    "yajra/laravel-datatables-oracle": "^9.7"
},
"require-dev": {
    "roave/security-advisories": "dev-master",
    "beyondcode/laravel-dump-server": "^1.2",
    "facade/ignition": "^2.0",
    "ajthinking/tinx": "^2.1",
    "fzaninotto/faker": "^1.4",
    "mockery/mockery": "^1.0",
    "nunomaduro/collision": "^4.1",
    "phpunit/phpunit": "^8.5",
    "symfony/thanks": "^1.0"
},

Solution

At least one of the packages you're using doesn't support Laravel 7 or 8. The composer error message tells you which one.

According to the error message, "silber/bouncer": "v1.0.0-rc.6" only supports up to Laravel 6. Looking at the composer.json for that package shows that support for Laravel 7 wasn't added until v1.0.0-rc.7, and support for Laravel 8 wasn't added until v1.0.0-rc.9.

You'll need to update your silber/bouncer dependency and then try again. If you run into another error, you'll need to look at the message to determine which package doesn't meet the requirements, and then figure out what version of that package you need to get to in order to meet the requirements.

Since Laravel 8 is fairly new, you may run into some packages that haven't been updated to support it yet (such as vimeo/laravel). In that case, you'll either need to wait until those packages support it, or fork the package and attempt to add the support yourself.

Answered By - patricus