1.0.0-alpha8

• Break: The install command now has --dev enabled by default. --no-dev can be used to install without dev requirements
• Added composer-plugin package type to allow extensibility, and deprecated composer-installer
• Added psr-4 autoloading support and deprecated target-dir since it is a better alternative
• Added --no-plugins flag to replace --no-custom-installers where available
• Added global command to operate Composer in a user-global directory
• Added licenses command to list the license of all your dependencies
• Added pre-status-cmd and post-status-cmd script events to the status command
• Added post-root-package-install and post-create-project-cmd script events to the create-project command
• Added pre-autoload-dump script event
• Added --rollback flag to self-update
• Added --no-install flag to create-project to skip installing the dependencies
• Added a hhvm platform package to require Facebook's HHVM implementation of PHP
• Added github-domains config option to allow using GitHub Enterprise with Composer's GitHub support
• Added prepend-autoloader config option to allow appending Composer's autoloader instead of the default prepend behavior
• Added Perforce support to the VCS repository
• Added a vendor/composer/autoload_files.php file that lists all files being included by the files autoloader
• Added support for the no_proxy env var and other proxy support improvements
• Added many robustness tweaks to make sure zip downloads work more consistently and corrupted caches are invalidated
• Added the release date to composer -V output
• Added autoloader-suffix config option to allow overriding the randomly generated autoloader class suffix
• Fixed BitBucket API usage
• Fixed parsing of inferred stability flags that are more stable than the minimum stability
• Fixed installation order of plugins/custom installers
• Fixed tilde and wildcard version constraints to be more intuitive regarding stabilities
• Fixed handling of target-dir changes when updating packages
• Improved performance of the class loader
• Improved memory usage and performance of solving dependencies
• Tons of minor bug fixes and improvements

1.0.0-alpha7

• Break: For forward compatibility, you should change your deployment scripts to run composer install --no-dev. The install command will install dev dependencies by default starting in the next release
• Break: The update command now has --dev enabled by default. --no-dev can be used to update without dev requirements, but it will create an incomplete lock file and is discouraged
• Break: Removed support for lock files created before 2012-09-15 due to their outdated unusable format
• Added prefer-stable flag to pick stable packages over unstable ones when possible
• Added preferred-install config option to always enable --prefer-source or --prefer-dist
• Added diagnose command to to system/network checks and find common problems
• Added wildcard support in the update whitelist, e.g. to update all packages of a vendor do composer update vendor/*
• Added archive command to archive the current directory or a given package
• Added run-script command to manually trigger scripts
• Added proprietary as valid license identifier for non-free code
• Added a php-64bit platform package that you can require to force a 64bit php
• Added a lib-ICU platform package
• Added a new official package type project for project-bootstrapping packages
• Added zip/dist local cache to speed up repetitive installations
• Added post-autoload-dump script event
• Added Event::getDevMode to let script handlers know if dev requirements are being installed
• Added discard-changes config option to control the default behavior when updating "dirty" dependencies
• Added use-include-path config option to make the autoloader look for files in the include path too
• Added cache-ttl, cache-files-ttl and cache-files-maxsize config option
• Added cache-dir, cache-files-dir, cache-repo-dir and cache-vcs-dir config option
• Added support for using http(s) authentication to non-github repos
• Added support for using multiple autoloaders at once (e.g. PHPUnit + application both using Composer autoloader)
• Added support for .inc files for classmap autoloading (legacy support, do not do this on new projects!)
• Added support for version constraints in show command, e.g. composer show monolog/monolog 1.4.*
• Added support for svn repositories containing packages in a deeper path (see package-path option)
• Added an artifact repository to scan a directory containing zipped packages
• Added --no-dev flag to install and update commands
• Added --stability (-s) flag to create-project to lower the required stability
• Added --no-progress to install and update to hide the progress indicators
• Added --available (-a) flag to the show command to display only available packages
• Added --name-only (-N) flag to the show command to show only package names (one per line, no formatting)
• Added --optimize-autoloader (-o) flag to optimize the autoloader from the install and update commands
• Added -vv and -vvv flags to get more verbose output, can be useful to debug some issues
• Added COMPOSER_NO_INTERACTION env var to do the equivalent of --no-interaction (should be set on build boxes, CI, PaaS)
• Added PHP 5.2 compatibility to the autoloader configuration files so they can be used to configure another autoloader
• Fixed handling of platform requirements of the root package when installing from lock
• Fixed handling of require-dev dependencies
• Fixed handling of unstable packages that should be downgraded to stable packages when updating to new version constraints
• Fixed parsing of the ~ operator combined with unstable versions
• Fixed the require command corrupting the json if the new requirement was invalid
• Fixed support of aliases used together with <version>#<reference> constraints
• Improved output of dependency solver problems by grouping versions of a package together
• Improved performance of classmap generation
• Improved mercurial support in various places
• Improved lock file format to minimize unnecessary diffs
• Improved the config command to support all options
• Improved the coverage of the validate command
• Tons of minor bug fixes and improvements

1.0.0-alpha6

• Schema: Added ability to pass additional options to repositories (i.e. ssh keys/client certificates to secure private repos)
• Schema: Added a new ~ operator that should be prefered over >=, see http://getcomposer.org/doc/01-basic-usage.md#package-versions
• Schema: Version constraints <x.y are assumed to be <x.y-dev unless specified as <x.y-stable to reduce confusion
• Added config command to edit/list config values, including --global switch for system config
• Added OAuth token support for the GitHub API
• Added ability to specify CLI commands as scripts in addition to PHP callbacks
• Added --prefer-dist flag to force installs of dev packages from zip archives instead of clones
• Added --working-dir (-d) flag to change the working directory
• Added --profile flag to all commands to display execution time and memory usage
• Added github-protocols config key to define the order of prefered protocols for github.com clones
• Added ability to interactively reset changes to vendor dirs while updating
• Added support for hg bookmarks in the hg driver
• Added support for svn repositories not following the standard trunk/branch/tags scheme
• Fixed git clones of dev versions so that you end up on a branch and not in detached HEAD
• Fixed "Package not installed" issues with --dev installs
• Fixed the lock file format to be a snapshot of all the package info at the time of update
• Fixed order of autoload requires to follow package dependencies
• Fixed rename() failures with "Access denied" on windows
• Improved memory usage to be more reasonable and not grow with the repository size
• Improved performance and memory usage of installs from composer.lock
• Improved performance of a few essential code paths
• Many bug small fixes and docs improvements

1.0.0-alpha5

• Added dump-autoload command to only regenerate the autoloader
• Added --optimize to dump-autoload to generate a more performant classmap-based autoloader for production
• Added status command to show if any source-installed dependency has local changes, use --verbose to see changed files
• Added --verbose flag to install and update that shows the new commits when updating source-installed dependencies
• Added --no-update flag to require to only modify the composer.json file but skip the update
• Added --no-custom-installers and --no-scripts to install, update and create-project to prevent all automatic code execution
• Added support for installing archives that contain only a single file
• Fixed APC related issues in the autoload script on high load websites
• Fixed installation of branches containing capital letters
• Fixed installation of custom dev versions/branches
• Improved the coverage of the validate command
• Improved PEAR scripts/binaries support
• Improved and fixed the output of various commands
• Improved error reporting on network failures and some other edge cases
• Various minor bug fixes and docs improvements

1.0.0-alpha4

• 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

1.0.0-alpha3

• Schema: Added require-dev for development-time requirements (tests, etc), install with --dev
• Schema: Added author.role to list the author's role in the project
• Schema: Added minimum-stability + @<stability> flags in require for restricting packages to a certain stability
• Schema: Removed recommend
• Schema: suggest is now informational and can use any description for a package, not only a constraint
• Break: vendor/.composer/autoload.php has been moved to vendor/autoload.php, other files are now in vendor/composer/
• Added caching of repository metadata (faster startup times & failover if packagist is down)
• Added removal of packages that are not needed anymore
• Added include_path support for legacy projects that are full of require_once statements
• Added installation notifications API to allow better statistics on Composer repositories
• Added support for proxies that require authentication
• Added support for private github repositories over https
• Added autoloading support for root packages that use target-dir
• Added awareness of the root package presence and support for it's provide/replace/conflict keys
• Added IOInterface::isDecorated to test for colored output support
• Added validation of licenses based on the SPDX registry
• Improved repository protocol to have large cacheable parts
• Fixed various bugs relating to package aliasing, proxy configuration, binaries
• Various bug fixes and docs improvements

1.0.0-alpha2

• Added create-project command to install a project from scratch with composer
• Added automated classmap autoloading support for non-PSR-0 compliant projects
• Added human readable error reporting when deps can not be solved
• Added support for private GitHub and SVN repositories (use --no-interaction for CI)
• Added "file" downloader type to download plain files
• Added support for authentication with svn repositories
• Added autoload support for PEAR repositories
• Improved clones from GitHub which now automatically select between git/https/http protocols
• Improved validate command to give more feedback
• Improved the search & show commands output
• Removed dependency on filter_var
• Various robustness & error handling improvements, docs fixes and more bug fixes

1.0.0-alpha1

• Initial release