Laravel 5.5从5.4升级出现错误

Question

i am trying to upgrade laravel 5.4 to 5.5 i have been following the upgrade guide of laravel

I use "composer update", I get the following error:

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: don't install laravel/framework v5.5.42
- Conclusion: don't install laravel/framework v5.5.41....

     - tymon/jwt-auth 1.0.0-beta.3 requires illuminate/support 
5.1.* || 5.2.* ||5.3.* || 5.4.* -> satisfiable by lavel/framework[v5.4.36], illuminate/support[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, v5.1.41, v5.1.6, v5.1.8, 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]. - tymon/jwt-auth 1.0.0-beta.3 requires illuminate/support 5.1.* || 5.2.* ||
5.3.* || 5.4.* -> satisfiable by laravel/framework[v5.4.36], lluminate/support[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, v5.1.41, v5.1.6, v5.1.8, 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].    - don't install laravel/framework v5.5.0|don't install illuminate/support v5.3.0    

- don't install laravel/framework v5.5.0|don't install illuminate/support v5.3.16....

- Installation request for laravel

 /framework 5.5.* -> satisfiable by laravel/framework[v5.5.0, v5.5.1, v5.5.10, v5.5.11, v5.5.12, v5.5.13, v5.5.14, v5.5.15, v5.5.16, v5.5.17, v5.5.18, v5.5.19, v5.5.2, v5.5.20, v5.5.21, v5.5.22, v5.5.23, v5.5.24, v5.5.25, v5.5.26, v5.5.27, v5.5.28, v5.5.29, v5.5.3, v5.5.30, v5.5.31, v5.5.32, v5.5.33, v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.38, v5.5.39, v5.5.4, v5.5.40, v5.5.41, v5.5.42, v5.5.5, v5.5.6, v5.5.7, v5.5.8, v5.5.9].
- Installation request for tymon/jwt-auth 1.0.0-beta.3 -> satisfiable by tymon/jwt-auth[1.0.0-beta.3].

is there any solution for this error.

i am using php 7.0.29

my composer.json

{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
    "php": ">=7.0.0",
    "barryvdh/laravel-cors": "^0.11.0",
    "bosnadev/repositories": "0.*",
    "braintree/braintree_php": "^3.35",
    "guzzlehttp/guzzle": "^6.3",
    "kreait/firebase-php": "^4.0",
    "laravel/framework": "5.5.*",
    "laravel/tinker": "~1.0",
    "lcobucci/jwt": "^3.2",
    "league/flysystem-aws-s3-v3": "^1.0",
    "setasign/fpdf": "^1.8",
    "setasign/fpdi": "^2.0",
    "smalot/pdfparser": "*",
    "tymon/jwt-auth": "1.0.0-beta.3",
    "webpatser/laravel-uuid": "^3.0"

},
"require-dev": {
    "fzaninotto/faker": "~1.4",
    "mockery/mockery": "0.9.*",
    "phpunit/phpunit": "~6.0",

    "filp/whoops": "~2.0"
},

Answer 1

My suggestion is to install Laravel 5.5 separately and then migrate your code inside newly installed laravel project.

Note: do this only if you haven't changed any vendor files.