Laravel 5.8 Log levels are not working

Hey there,

in my Laravel 5.8 application daily logs are working fine. However, when changing the log level inside the logging.php, it always keeps logging level debug. Other changes inside the logging.php get applied, but not the level.

My logging.php:

<?php
use Monolog\Handler\StreamHandler;
return [
    /*
    |--------------------------------------------------------------------------
    | Default Log Channel
    |--------------------------------------------------------------------------
    |
    | This option defines the default log channel that gets used when writing
    | messages to the logs. The name specified in this option should match
    | one of the channels defined in the "channels" configuration array.
    |
    */
    'default' => 'daily',
    /*
    |--------------------------------------------------------------------------
    | Log Channels
    |--------------------------------------------------------------------------
    |
    | Here you may configure the log channels for your application. Out of
    | the box, Laravel uses the Monolog PHP logging library. This gives
    | you a variety of powerful log handlers / formatters to utilize.
    |
    | Available Drivers: "single", "daily", "slack", "syslog",
    |                    "errorlog", "monolog",
    |                    "custom", "stack"
    |
    */
    'channels' => [
        'stack' => [
            'driver' => 'stack',
            'channels' => ['single'],
        ],
        'single' => [
            'driver' => 'single',
            'path' => storage_path('logs/laravel.log'),
            'level' => 'debug',
        ],
        'daily' => [
            'driver' => 'daily',
            'path' => storage_path('logs/laravel.log'),
            'level' => 'error',
            'days' => 7,
        ],
        'slack' => [
            'driver' => 'slack',
            'url' => env('LOG_SLACK_WEBHOOK_URL'),
            'username' => 'Laravel Log',
            'emoji' => ':boom:',
            'level' => 'critical',
        ],
        'stderr' => [
            'driver' => 'monolog',
            'handler' => StreamHandler::class,
            'with' => [
                'stream' => 'php://stderr',
            ],
        ],
        'syslog' => [
            'driver' => 'syslog',
            'level' => 'debug',
        ],
        'errorlog' => [
            'driver' => 'errorlog',
            'level' => 'debug',
        ],
    ],
];