composer require laravel/passport not working in laravel 5.8

Question

I'm using Laravel 5.8 although 6.0.3 is available. I'm using it because the tutorial I'm following is using Laravel 5.8.

When, I command:

composer require laravel/passport

it throws an error

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

Problem 1 - Conclusion: remove laravel/framework v5.8.35 - Conclusion: don't install laravel/framework v5.8.35 - laravel/passport 8.x-dev requires illuminate/encryption ^6.0|^7.0 -> satisfiable by illuminate/encryption[6.x-dev, 7.0.x-dev, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.2.0, v6.3.0, v6.4.1]. - laravel/passport v8.0.0 requires illuminate/encryption ^6.0|^7.0 -> satisfiable by illuminate/encryption[6.x-dev, 7.0.x-dev, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.2.0, v6.3.0, v6.4.1]. - don't install illuminate/encryption 6.x-dev|don't install laravel/framework v5.8.35 - don't install illuminate/encryption 7.0.x-dev|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.0.0|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.0.1|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.0.2|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.0.3|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.0.4|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.1.0|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.2.0|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.3.0|don't install laravel/framework v5.8.35 - don't install illuminate/encryption v6.4.1|don't install laravel/framework v5.8.35 - Installation request for laravel/framework (locked at v5.8.35, required as 5.8.*) -> satisfiable by laravel/framework[v5.8.35]. - Installation request for laravel/passport ^8.0 -> satisfiable by laravel/passport[8.x-dev, v8.0.0].

Installation failed, reverting ./composer.json to its original content.

Answer 1

Latest version of Laravel Passport dropped support for Laravel 5.8

Install earlier version

composer require laravel/passport:7.5.1

From the release notes of Laravel Passport

Changed

• Rework HandlesOAuthErrors trait to middleware (#937)
• Use a renderable exception for OAuth errors (#1066)
• Use diactoros 2.0 and psr-http-factory (aadf603)
• Replaced helpers with Blade directives (#939)
• Use caret for constraints (d906804)
• Dropped support for Laravel 5.8 (654cc09)
• Dropped support for PHP 7.1 (3c830ac)
• Upgrade to league/oauth2-server 8.0 (97e3026)