title: Composer update says nothing to install or update
body: <ul>
  <li>Laravel Version: 5.6.35</li>
  <li>PHP Version: 7.1.20</li>
  <li>Database Driver &amp; Version: MySQL v5.5.61-0ubuntu0.14.04.1</li>
  </ul>
  
  <h3>Description:</h3>
  
  <p>At the time of this question, the latest version of Laravel is 5.6.37 - released 2 days ago i.e., 2nd September, 2018.</p>
  
  <p>I already have a project that I am working on. On running <code>composer update</code>, I always get the following:</p>
  
  <pre><code>Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Nothing to install or update
  Generating optimized autoload files
  &gt; Illuminate\Foundation\ComposerScripts::postAutoloadDump
  &gt; @php artisan package:discover
  Discovered Package: fideloper/proxy
  Discovered Package: laravel/tinker
  Discovered Package: barryvdh/laravel-debugbar
  Discovered Package: nunomaduro/collision
  Package manifest generated successfully.
  </code></pre>
  
  <p>This started only after I updated my laravel project to 5.6.35.</p>
  
  <p>This is not the case when I install a new laravel project. On new installation, the latest version of laravel, i.e., 5.6.37 gets downloaded.</p>
  
  <p>Below is my composer.json file</p>
  
  <pre><code>{
      "name": "laravel/laravel",
      "description": "The Laravel Framework.",
      "keywords": ["framework", "laravel"],
      "license": "MIT",
      "type": "project",
      "require": {
          "php": "^7.1.3",
          "fideloper/proxy": "^4.0",
          "laravel/framework": "5.6.*",
          "laravel/tinker": "^1.0",
          "spinen/laravel-mail-assertions": "^0.3.4"
      },
      "require-dev": {
          "barryvdh/laravel-debugbar": "^3.1",
          "codedungeon/phpunit-result-printer": "^0.19.13",
          "filp/whoops": "^2.0",
          "fzaninotto/faker": "^1.4",
          "mockery/mockery": "^1.0",
          "nunomaduro/collision": "^2.0",
          "phpunit/phpunit": "^7.0"
      },
      "autoload": {
          "classmap": [
              "database/seeds",
              "database/factories"
          ],
          "psr-4": {
              "Larammerce\\": "app/"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "Tests\\": "tests/"
          }
      },
      "extra": {
          "laravel": {
              "dont-discover": [
              ]
          }
      },
      "scripts": {
          "post-root-package-install": [
              "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
          ],
          "post-create-project-cmd": [
              "@php artisan key:generate"
          ],
          "post-autoload-dump": [
              "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
              "@php artisan package:discover"
          ]
      },
      "config": {
          "preferred-install": "dist",
          "sort-packages": true,
          "optimize-autoloader": true
      },
      "minimum-stability": "dev",
      "prefer-stable": true
  }
  </code></pre>
  
  <h3>Steps To Reproduce:</h3>
  
  <ol>
  <li>Have a Laravel project &lt;= 5.6.35</li>
  <li>Run composer update</li>
  </ol>
  
  <p>I don't know where and what should be the mistake that I must have committed.</p>
  
  <h3>I have tried the following</h3>
  
  <ol>
  <li>Running <code>composer dump-autoload &amp;&amp; composer update</code></li>
  <li>Deleting <code>composer.lock</code> file and <code>vendor</code> directory. Then running <code>composer update</code></li>
  </ol>
  
  <p>But couldn't get my project updated to Laravel version 5.6.37</p>
  
  <hr>
  
  <p><strong>Update 1</strong></p>
  
  <p>On running <code>composer show -i</code> I got the following:</p>
  
  <pre><code>barryvdh/laravel-debugbar             v3.1.5   PHP Debugbar integration for Laravel
  codedungeon/php-cli-colors            1.10.7   PHP Package for using color output in CLI commands
  codedungeon/phpunit-result-printer    0.19.13  PHPUnit Pretty Result Printer
  dnoegel/php-xdg-base-dir              0.1      implementation of xdg base directory specification for php
  doctrine/inflector                    v1.3.0   Common String Manipulations with regard to casing and singular/plural rules.
  doctrine/instantiator                 1.1.0    A small, lightweight utility to instantiate objects in PHP without invoking their constructors
  doctrine/lexer                        v1.0.1   Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.
  dragonmantank/cron-expression         v2.2.0   CRON for PHP: Calculate the next or previous run date and determine if a CRON expression is due
  egulias/email-validator               2.1.5    A library for validating emails against several RFCs
  erusev/parsedown                      1.7.1    Parser for Markdown.
  fideloper/proxy                       4.0.0    Set trusted proxies for Laravel
  filp/whoops                           2.2.0    php error handling for cool kids
  fzaninotto/faker                      v1.8.0   Faker is a PHP library that generates fake data for you.
  hamcrest/hamcrest-php                 v2.0.0   This is the PHP port of Hamcrest Matchers
  hassankhan/config                     1.1.0    Lightweight configuration file loader that supports PHP, INI, XML, JSON, and YAML files
  jakub-onderka/php-console-color       0.1     
  jakub-onderka/php-console-highlighter v0.3.2  
  laravel/framework                     v5.6.35  The Laravel Framework.
  laravel/tinker                        v1.0.7   Powerful REPL for the Laravel framework.
  league/flysystem                      1.0.46   Filesystem abstraction: Many filesystems, one API.
  maximebf/debugbar                     v1.15.0  Debug bar in the browser for php application
  mockery/mockery                       1.1.0    Mockery is a simple yet flexible PHP mock object framework
  monolog/monolog                       1.23.0   Sends your logs to files, sockets, inboxes, databases and various web services
  myclabs/deep-copy                     1.8.1    Create deep copies (clones) of your objects
  nesbot/carbon                         1.25.0   A simple API extension for DateTime.
  nikic/php-parser                      v4.0.3   A PHP parser written in PHP
  nunomaduro/collision                  v2.0.3   Cli error handling for console/command-line PHP applications.
  paragonie/random_compat               v9.99.99 PHP 5.x polyfill for random_bytes() and random_int() from PHP 7
  phar-io/manifest                      1.0.3    Component for reading phar.io manifest information from a PHP Archive (PHAR)
  phar-io/version                       2.0.1    Library for handling version information and constraints
  phpdocumentor/reflection-common       1.0.1    Common reflection classes used by phpdocumentor to reflect the code structure
  phpdocumentor/reflection-docblock     4.3.0    With this component, a library can provide support for annotations via DocBlocks or otherwise r...
  phpdocumentor/type-resolver           0.4.0   
  phpspec/prophecy                      1.8.0    Highly opinionated mocking framework for PHP 5.3+
  phpunit/php-code-coverage             6.0.7    Library that provides collection, processing, and rendering functionality for PHP code coverage...
  phpunit/php-file-iterator             2.0.1    FilterIterator implementation that filters files based on a list of suffixes.
  phpunit/php-text-template             1.2.1    Simple template engine.
  phpunit/php-timer                     2.0.0    Utility class for timing
  phpunit/php-token-stream              3.0.0    Wrapper around PHP's tokenizer extension.
  phpunit/phpunit                       7.3.2    The PHP Unit Testing framework.
  psr/container                         1.0.0    Common Container Interface (PHP FIG PSR-11)
  psr/log                               1.0.2    Common interface for logging libraries
  psr/simple-cache                      1.0.1    Common interfaces for simple caching
  psy/psysh                             v0.9.7   An interactive shell for modern PHP.
  ramsey/uuid                           3.8.0    Formerly rhumsaa/uuid. A PHP 5.4+ library for generating RFC 4122 version 1, 3, 4, and 5 univer...
  sebastian/code-unit-reverse-lookup    1.0.1    Looks up which function or method a line of code belongs to
  sebastian/comparator                  3.0.2    Provides the functionality to compare PHP values for equality
  sebastian/diff                        3.0.1    Diff implementation
  sebastian/environment                 3.1.0    Provides functionality to handle HHVM/PHP environments
  sebastian/exporter                    3.1.0    Provides the functionality to export PHP variables for visualization
  sebastian/global-state                2.0.0    Snapshotting of global state
  sebastian/object-enumerator           3.0.3    Traverses array structures and object graphs to enumerate all referenced objects
  sebastian/object-reflector            1.1.1    Allows reflection of object attributes, including inherited and non-public ones
  sebastian/recursion-context           3.0.0    Provides functionality to recursively process PHP variables
  sebastian/resource-operations         1.0.0    Provides a list of PHP built-in functions that operate on resources
  sebastian/version                     2.0.1    Library that helps with managing the version number of Git-hosted PHP projects
  spinen/laravel-mail-assertions        0.3.4    PHPUnit mail assertions for testing email in Laravel.
  swiftmailer/swiftmailer               v6.1.2   Swiftmailer, free feature-rich PHP mailer
  symfony/console                       v4.1.4   Symfony Console Component
  symfony/css-selector                  v4.1.4   Symfony CssSelector Component
  symfony/debug                         v4.1.4   Symfony Debug Component
  symfony/event-dispatcher              v4.1.4   Symfony EventDispatcher Component
  symfony/finder                        v4.1.4   Symfony Finder Component
  symfony/http-foundation               v4.1.4   Symfony HttpFoundation Component
  symfony/http-kernel                   v4.1.4   Symfony HttpKernel Component
  symfony/polyfill-ctype                v1.9.0   Symfony polyfill for ctype functions
  symfony/polyfill-mbstring             v1.9.0   Symfony polyfill for the Mbstring extension
  symfony/polyfill-php72                v1.9.0   Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions
  symfony/process                       v4.1.4   Symfony Process Component
  symfony/routing                       v4.1.4   Symfony Routing Component
  symfony/translation                   v4.1.4   Symfony Translation Component
  symfony/var-dumper                    v4.1.4   Symfony mechanism for exploring and dumping PHP variables
  symfony/yaml                          v4.1.4   Symfony Yaml Component
  theseer/tokenizer                     1.1.0    A small library for converting tokenized PHP source code into XML and potentially other formats
  tijsverkoyen/css-to-inline-styles     2.2.1    CssToInlineStyles is a class that enables you to convert HTML-pages/files into HTML-pages/files...
  vlucas/phpdotenv                      v2.5.1   Loads environment variables from `.env` to `getenv()`, `$_ENV` and `$_SERVER` automagically.
  webmozart/assert                      1.3.0    Assertions to validate method input/output with nice error messages.
  </code></pre>