• Break: The default minimum-stability is now stable, read more
• Break: Custom installers now receive the IO instance and a Composer instance in their constructor
• Schema: Added references for dev versions, requiring dev-master#abcdef for example will force the abcdef commit
• Schema: Added support key with some more metadata (email, issues, forum, wiki, irc, source)
• Schema: Added != operator for version constraints in require/require-dev
• Added a recommendation for package names to be lower-cased/with-dashes, it will be enforced for new packages on Pacakgist
• Added require command to add a package to your requirements and install it
• Added a whitelist to update. Calling composer update foo/bar foo/baz allows you to update only those packages
• Added support for overriding repositories in the system config (define repositories in ~/.composer/config.json)
• Added lib-* packages to the platform repository, e.g. lib-pcre contains the pcre version
• Added caching of GitHub metadata (faster startup time with custom GitHub VCS repos)
• Added caching of SVN metadata (faster startup time with custom SVN VCS repos)
• Added support for file:// URLs to GitDriver
• Added --self flag to the show command to display the infos of the root package
• Added --dev flag to create-project command
• Added --no-scripts to install and update commands to avoid triggering the scripts
• Added COMPOSER_ROOT_VERSION env var to specify the version of the root package (fixes some edge cases)
• Added support for multiple custom installers in one package
• Added files autoloading method which requires files on every request, e.g. to load functional code
• Added automatic recovery for lock files that contain references to rewritten (force pushed) commits
• Improved PEAR repositories support and package.xml extraction
• Improved and fixed the output of various commands
• Fixed the order of installation of requirements (they are always installed before the packages requiring them)
• Cleaned up / refactored the dependency solver code as well as the output for unsolvable requirements
• Various bug fixes and docs improvements