diff --git a/src/Composer/Factory.php b/src/Composer/Factory.php
index 1db5c11db..9f32ec27c 100644
--- a/src/Composer/Factory.php
+++ b/src/Composer/Factory.php
@@ -152,6 +152,7 @@ class Factory
     protected function addLocalRepository(RepositoryManager $rm, $vendorDir)
     {
         $rm->setLocalRepository(new Repository\InstalledFilesystemRepository(new JsonFile($vendorDir.'/.composer/installed.json')));
+        $rm->setLocalDevRepository(new Repository\InstalledFilesystemRepository(new JsonFile($vendorDir.'/.composer/installed_dev.json')));
     }
 
     protected function addPackagistRepository(array $localConfig)
@@ -202,18 +203,20 @@ class Factory
     protected function createInstallationManager(Repository\RepositoryManager $rm, Downloader\DownloadManager $dm, $vendorDir, $binDir, IOInterface $io)
     {
         $im = new Installer\InstallationManager($vendorDir);
-        $im->addInstaller(new Installer\LibraryInstaller($vendorDir, $binDir, $dm, $rm->getLocalRepository(), $io, null));
-        $im->addInstaller(new Installer\InstallerInstaller($vendorDir, $binDir, $dm, $rm->getLocalRepository(), $io, $im));
-        $im->addInstaller(new Installer\MetapackageInstaller($rm->getLocalRepository(), $io));
+        $im->addInstaller(new Installer\LibraryInstaller($vendorDir, $binDir, $dm, $io, null));
+        $im->addInstaller(new Installer\InstallerInstaller($vendorDir, $binDir, $dm, $io, $im, $rm->getLocalRepositories()));
+        $im->addInstaller(new Installer\MetapackageInstaller($io));
 
         return $im;
     }
 
     protected function purgePackages(Repository\RepositoryManager $rm, Installer\InstallationManager $im)
     {
-        foreach ($rm->getLocalRepository()->getPackages() as $package) {
-            if (!$im->isPackageInstalled($package)) {
-                $rm->getLocalRepository()->removePackage($package);
+        foreach ($rm->getLocalRepositories() as $repo) {
+            foreach ($repo->getPackages() as $package) {
+                if (!$im->isPackageInstalled($repo, $package)) {
+                    $repo->removePackage($package);
+                }
             }
         }
     }
diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index e459c94ca..dca27a6eb 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -122,33 +122,14 @@ class Installer
             $this->downloadManager->setPreferSource(true);
         }
 
-        // create local repo, this contains all packages that are installed in the local project
-        $localRepo = $this->repositoryManager->getLocalRepository();
         // create installed repo, this contains all local packages + platform packages (php & extensions)
-        $installedRepo = new CompositeRepository(array($localRepo, new PlatformRepository()));
+        $repos = array_merge($this->repositoryManager->getLocalRepositories(), array(new PlatformRepository()));
+        $installedRepo = new CompositeRepository($repos);
         if ($this->additionalInstalledRepository) {
             $installedRepo->addRepository($this->additionalInstalledRepository);
         }
 
-        // prepare aliased packages
-        if (!$this->update && $this->locker->isLocked()) {
-            $aliases = $this->locker->getAliases();
-        } else {
-            $aliases = $this->package->getAliases();
-        }
-        foreach ($aliases as $alias) {
-            foreach ($this->repositoryManager->findPackages($alias['package'], $alias['version']) as $package) {
-                $package->setAlias($alias['alias_normalized']);
-                $package->setPrettyAlias($alias['alias']);
-                $package->getRepository()->addPackage(new AliasPackage($package, $alias['alias_normalized'], $alias['alias']));
-            }
-            foreach ($this->repositoryManager->getLocalRepository()->findPackages($alias['package'], $alias['version']) as $package) {
-                $package->setAlias($alias['alias_normalized']);
-                $package->setPrettyAlias($alias['alias']);
-                $this->repositoryManager->getLocalRepository()->addPackage(new AliasPackage($package, $alias['alias_normalized'], $alias['alias']));
-                $this->repositoryManager->getLocalRepository()->removePackage($package);
-            }
-        }
+        $aliases = $this->aliasPackages();
 
         // creating repository pool
         $pool = new Pool;
@@ -157,34 +138,74 @@ class Installer
             $pool->addRepository($repository);
         }
 
-        // dispatch pre event
         if (!$this->dryRun) {
+            // dispatch pre event
             $eventName = $this->update ? ScriptEvents::PRE_UPDATE_CMD : ScriptEvents::PRE_INSTALL_CMD;
             $this->eventDispatcher->dispatchCommandEvent($eventName);
         }
 
+        $suggestedPackages = $this->doInstall($this->repositoryManager->getLocalRepository(), $installedRepo, $pool, $aliases);
+        if ($this->devMode) {
+            $devSuggested = $this->doInstall($this->repositoryManager->getLocalDevRepository(), $installedRepo, $pool, $aliases, true);
+            $suggestedPackages = array_merge($suggestedPackages, $devSuggested);
+        }
+
+        // dump suggestions
+        foreach ($suggestedPackages as $suggestion) {
+            $this->io->write($suggestion['source'].' suggests installing '.$suggestion['target'].' ('.$suggestion['reason'].')');
+        }
+
+        if (!$this->dryRun) {
+            // write lock
+            if ($this->update || !$this->locker->isLocked()) {
+                $updatedLock = $this->locker->setLockData(
+                    $this->repositoryManager->getLocalRepository()->getPackages(),
+                    $this->repositoryManager->getLocalDevRepository()->getPackages(),
+                    $aliases
+                );
+                if ($updatedLock) {
+                    $this->io->write('<info>Writing lock file</info>');
+                }
+            }
+
+            // write autoloader
+            $this->io->write('<info>Generating autoload files</info>');
+            $generator = new AutoloadGenerator;
+            $localRepos = new CompositeRepository($this->repositoryManager->getLocalRepositories());
+            $generator->dump($localRepos, $this->package, $this->installationManager, $this->installationManager->getVendorPath().'/.composer');
+
+            // dispatch post event
+            $eventName = $this->update ? ScriptEvents::POST_UPDATE_CMD : ScriptEvents::POST_INSTALL_CMD;
+            $this->eventDispatcher->dispatchCommandEvent($eventName);
+        }
+
+        return true;
+    }
+
+    protected function doInstall($localRepo, $installedRepo, $pool, $aliases, $devMode = false)
+    {
         // creating requirements request
         $installFromLock = false;
         $request = new Request($pool);
         if ($this->update) {
-            $this->io->write('Updating dependencies');
+            $this->io->write('<info>Updating '.($devMode ? 'dev ': '').'dependencies</info>');
 
             $request->updateAll();
 
-            $links = $this->collectLinks();
+            $links = $devMode ? $this->package->getDevRequires() : $this->package->getRequires();
 
             foreach ($links as $link) {
                 $request->install($link->getTarget(), $link->getConstraint());
             }
         } elseif ($this->locker->isLocked()) {
             $installFromLock = true;
-            $this->io->write('Installing from lock file');
+            $this->io->write('<info>Installing '.($devMode ? 'dev ': '').'dependencies from lock file</info>');
 
-            if (!$this->locker->isFresh()) {
+            if (!$this->locker->isFresh() && !$devMode) {
                 $this->io->write('<warning>Your lock file is out of sync with your composer.json, run "composer.phar update" to update dependencies</warning>');
             }
 
-            foreach ($this->locker->getLockedPackages() as $package) {
+            foreach ($this->locker->getLockedPackages($devMode) as $package) {
                 $version = $package->getVersion();
                 foreach ($aliases as $alias) {
                     if ($alias['package'] === $package->getName() && $alias['version'] === $package->getVersion()) {
@@ -196,15 +217,25 @@ class Installer
                 $request->install($package->getName(), $constraint);
             }
         } else {
-            $this->io->write('Installing dependencies');
+            $this->io->write('<info>Installing '.($devMode ? 'dev ': '').'dependencies</info>');
 
-            $links = $this->collectLinks();
+            $links = $devMode ? $this->package->getDevRequires() : $this->package->getRequires();
 
             foreach ($links as $link) {
                 $request->install($link->getTarget(), $link->getConstraint());
             }
         }
 
+        // fix the version all installed packages that are not in the current local repo to prevent rogue updates
+        foreach ($installedRepo->getPackages() as $package) {
+            if ($package->getRepository() === $localRepo || $package->getRepository() instanceof PlatformRepository) {
+                continue;
+            }
+
+            $constraint = new VersionConstraint('=', $package->getVersion());
+            $request->install($package->getName(), $constraint);
+        }
+
         // prepare solver
         $policy = new DefaultPolicy();
         $solver = new Solver($policy, $pool, $installedRepo);
@@ -261,16 +292,16 @@ class Installer
         }
 
         // anti-alias local repository to allow updates to work fine
-        foreach ($this->repositoryManager->getLocalRepository()->getPackages() as $package) {
+        foreach ($localRepo->getPackages() as $package) {
             if ($package instanceof AliasPackage) {
-                $this->repositoryManager->getLocalRepository()->addPackage(clone $package->getAliasOf());
-                $this->repositoryManager->getLocalRepository()->removePackage($package);
+                $package->getRepository()->addPackage(clone $package->getAliasOf());
+                $package->getRepository()->removePackage($package);
             }
         }
 
         // execute operations
         if (!$operations) {
-            $this->io->write('<info>Nothing to install or update</info>');
+            $this->io->write('Nothing to install or update');
         }
 
         $suggestedPackages = array();
@@ -311,7 +342,7 @@ class Installer
                         }
                     }
                 }
-                $this->installationManager->execute($operation);
+                $this->installationManager->execute($localRepo, $operation);
 
                 $this->eventDispatcher->dispatchPackageEvent(constant('Composer\Script\ScriptEvents::POST_PACKAGE_'.strtoupper($operation->getJobType())), $operation);
 
@@ -319,37 +350,34 @@ class Installer
             }
         }
 
-        // dump suggestions
-        foreach ($suggestedPackages as $suggestion) {
-            $this->io->write($suggestion['source'].' suggests installing '.$suggestion['target'].' ('.$suggestion['reason'].')');
-        }
-
-        if (!$this->dryRun) {
-            // write lock
-            if ($this->update || !$this->locker->isLocked()) {
-                if ($this->locker->setLockData($localRepo->getPackages(), $aliases)) {
-                    $this->io->write('<info>Writing lock file</info>');
-                }
-            }
-
-            // write autoloader
-            $this->io->write('<info>Generating autoload files</info>');
-            $generator = new AutoloadGenerator;
-            $generator->dump($localRepo, $this->package, $this->installationManager, $this->installationManager->getVendorPath().'/.composer');
-
-            // dispatch post event
-            $eventName = $this->update ? ScriptEvents::POST_UPDATE_CMD : ScriptEvents::POST_INSTALL_CMD;
-            $this->eventDispatcher->dispatchCommandEvent($eventName);
-        }
-
-        return true;
+        return $suggestedPackages;
     }
 
-    private function collectLinks()
+    private function aliasPackages()
     {
-        $links = $this->package->getRequires();
+        if (!$this->update && $this->locker->isLocked()) {
+            $aliases = $this->locker->getAliases();
+        } else {
+            $aliases = $this->package->getAliases();
+        }
 
-        return $links;
+        foreach ($aliases as $alias) {
+            foreach ($this->repositoryManager->findPackages($alias['package'], $alias['version']) as $package) {
+                $package->setAlias($alias['alias_normalized']);
+                $package->setPrettyAlias($alias['alias']);
+                $package->getRepository()->addPackage(new AliasPackage($package, $alias['alias_normalized'], $alias['alias']));
+            }
+            foreach ($this->repositoryManager->getLocalRepositories() as $repo) {
+                foreach ($repo->findPackages($alias['package'], $alias['version']) as $package) {
+                    $package->setAlias($alias['alias_normalized']);
+                    $package->setPrettyAlias($alias['alias']);
+                    $package->getRepository()->addPackage(new AliasPackage($package, $alias['alias_normalized'], $alias['alias']));
+                    $package->getRepository()->removePackage($package);
+                }
+            }
+        }
+
+        return $aliases;
     }
 
     /**
diff --git a/src/Composer/Installer/InstallationManager.php b/src/Composer/Installer/InstallationManager.php
index 6f397b358..c015bd9f9 100644
--- a/src/Composer/Installer/InstallationManager.php
+++ b/src/Composer/Installer/InstallationManager.php
@@ -14,6 +14,7 @@ namespace Composer\Installer;
 
 use Composer\Package\PackageInterface;
 use Composer\Package\AliasPackage;
+use Composer\Repository\RepositoryInterface;
 use Composer\Repository\NotifiableRepositoryInterface;
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\DependencyResolver\Operation\InstallOperation;
@@ -95,32 +96,35 @@ class InstallationManager
     /**
      * Checks whether provided package is installed in one of the registered installers.
      *
+     * @param   RepositoryInterface    $repo    repository in which to check
      * @param   PackageInterface    $package    package instance
      *
      * @return  Boolean
      */
-    public function isPackageInstalled(PackageInterface $package)
+    public function isPackageInstalled(RepositoryInterface $repo, PackageInterface $package)
     {
-        return $this->getInstaller($package->getType())->isInstalled($package);
+        return $this->getInstaller($package->getType())->isInstalled($repo, $package);
     }
 
     /**
      * Executes solver operation.
      *
+     * @param   RepositoryInterface $repo       repository in which to check
      * @param   OperationInterface  $operation  operation instance
      */
-    public function execute(OperationInterface $operation)
+    public function execute(RepositoryInterface $repo, OperationInterface $operation)
     {
         $method = $operation->getJobType();
-        $this->$method($operation);
+        $this->$method($repo, $operation);
     }
 
     /**
      * Executes install operation.
      *
+     * @param   RepositoryInterface $repo       repository in which to check
      * @param   InstallOperation    $operation  operation instance
      */
-    public function install(InstallOperation $operation)
+    public function install(RepositoryInterface $repo, InstallOperation $operation)
     {
         $package = $operation->getPackage();
         if ($package instanceof AliasPackage) {
@@ -128,16 +132,17 @@ class InstallationManager
             $package->setInstalledAsAlias(true);
         }
         $installer = $this->getInstaller($package->getType());
-        $installer->install($package);
+        $installer->install($repo, $package);
         $this->notifyInstall($package);
     }
 
     /**
      * Executes update operation.
      *
+     * @param   RepositoryInterface $repo       repository in which to check
      * @param   InstallOperation    $operation  operation instance
      */
-    public function update(UpdateOperation $operation)
+    public function update(RepositoryInterface $repo, UpdateOperation $operation)
     {
         $initial = $operation->getInitialPackage();
         if ($initial instanceof AliasPackage) {
@@ -154,27 +159,28 @@ class InstallationManager
 
         if ($initialType === $targetType) {
             $installer = $this->getInstaller($initialType);
-            $installer->update($initial, $target);
+            $installer->update($repo, $initial, $target);
             $this->notifyInstall($target);
         } else {
-            $this->getInstaller($initialType)->uninstall($initial);
-            $this->getInstaller($targetType)->install($target);
+            $this->getInstaller($initialType)->uninstall($repo, $initial);
+            $this->getInstaller($targetType)->install($repo, $target);
         }
     }
 
     /**
      * Uninstalls package.
      *
+     * @param   RepositoryInterface $repo       repository in which to check
      * @param   UninstallOperation  $operation  operation instance
      */
-    public function uninstall(UninstallOperation $operation)
+    public function uninstall(RepositoryInterface $repo, UninstallOperation $operation)
     {
         $package = $operation->getPackage();
         if ($package instanceof AliasPackage) {
             $package = $package->getAliasOf();
         }
         $installer = $this->getInstaller($package->getType());
-        $installer->uninstall($package);
+        $installer->uninstall($repo, $package);
     }
 
     /**
diff --git a/src/Composer/Installer/InstallerInstaller.php b/src/Composer/Installer/InstallerInstaller.php
index a43d0f15a..9519d384b 100644
--- a/src/Composer/Installer/InstallerInstaller.php
+++ b/src/Composer/Installer/InstallerInstaller.php
@@ -33,17 +33,20 @@ class InstallerInstaller extends LibraryInstaller
      * @param   string                      $vendorDir  relative path for packages home
      * @param   string                      $binDir     relative path for binaries
      * @param   DownloadManager             $dm         download manager
-     * @param   WritableRepositoryInterface $repository repository controller
      * @param   IOInterface                 $io         io instance
+     * @param   InstallationManager         $im         installation manager
+     * @param   array                       $localRepositories array of WritableRepositoryInterface
      */
-    public function __construct($vendorDir, $binDir, DownloadManager $dm, WritableRepositoryInterface $repository, IOInterface $io, InstallationManager $im)
+    public function __construct($vendorDir, $binDir, DownloadManager $dm, IOInterface $io, InstallationManager $im, array $localRepositories)
     {
-        parent::__construct($vendorDir, $binDir, $dm, $repository, $io, 'composer-installer');
+        parent::__construct($vendorDir, $binDir, $dm, $io, 'composer-installer');
         $this->installationManager = $im;
 
-        foreach ($repository->getPackages() as $package) {
-            if ('composer-installer' === $package->getType()) {
-                $this->registerInstaller($package);
+        foreach ($localRepositories as $repo) {
+            foreach ($repo->getPackages() as $package) {
+                if ('composer-installer' === $package->getType()) {
+                    $this->registerInstaller($package);
+                }
             }
         }
     }
@@ -51,28 +54,28 @@ class InstallerInstaller extends LibraryInstaller
     /**
      * {@inheritDoc}
      */
-    public function install(PackageInterface $package)
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package)
     {
         $extra = $package->getExtra();
         if (empty($extra['class'])) {
             throw new \UnexpectedValueException('Error while installing '.$package->getPrettyName().', composer-installer packages should have a class defined in their extra key to be usable.');
         }
 
-        parent::install($package);
+        parent::install($repo, $package);
         $this->registerInstaller($package);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function update(PackageInterface $initial, PackageInterface $target)
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
     {
         $extra = $target->getExtra();
         if (empty($extra['class'])) {
             throw new \UnexpectedValueException('Error while installing '.$target->getPrettyName().', composer-installer packages should have a class defined in their extra key to be usable.');
         }
 
-        parent::update($initial, $target);
+        parent::update($repo, $initial, $target);
         $this->registerInstaller($target);
     }
 
@@ -97,7 +100,7 @@ class InstallerInstaller extends LibraryInstaller
         }
 
         $extra = $package->getExtra();
-        $installer = new $class($this->vendorDir, $this->binDir, $this->downloadManager, $this->repository, $this->io);
+        $installer = new $class($this->vendorDir, $this->binDir, $this->downloadManager, $this->io);
         $this->installationManager->addInstaller($installer);
     }
 }
diff --git a/src/Composer/Installer/InstallerInterface.php b/src/Composer/Installer/InstallerInterface.php
index 36c023b3b..3716ec6df 100644
--- a/src/Composer/Installer/InstallerInterface.php
+++ b/src/Composer/Installer/InstallerInterface.php
@@ -14,11 +14,13 @@ namespace Composer\Installer;
 
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\Package\PackageInterface;
+use Composer\Repository\WritableRepositoryInterface;
 
 /**
  * Interface for the package installation manager.
  *
  * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
  */
 interface InstallerInterface
 {
@@ -33,35 +35,39 @@ interface InstallerInterface
     /**
      * Checks that provided package is installed.
      *
+     * @param   WritableRepositoryInterface $repo    repository in which to check
      * @param   PackageInterface    $package    package instance
      *
      * @return  Boolean
      */
-    function isInstalled(PackageInterface $package);
+    function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package);
 
     /**
      * Installs specific package.
      *
+     * @param   WritableRepositoryInterface $repo    repository in which to check
      * @param   PackageInterface    $package    package instance
      */
-    function install(PackageInterface $package);
+    function install(WritableRepositoryInterface $repo, PackageInterface $package);
 
     /**
      * Updates specific package.
      *
+     * @param   WritableRepositoryInterface $repo    repository in which to check
      * @param   PackageInterface    $initial    already installed package version
      * @param   PackageInterface    $target     updated version
      *
      * @throws  InvalidArgumentException        if $from package is not installed
      */
-    function update(PackageInterface $initial, PackageInterface $target);
+    function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target);
 
     /**
      * Uninstalls specific package.
      *
+     * @param   WritableRepositoryInterface $repo    repository in which to check
      * @param   PackageInterface    $package    package instance
      */
-    function uninstall(PackageInterface $package);
+    function uninstall(WritableRepositoryInterface $repo, PackageInterface $package);
 
     /**
      * Returns the installation path of a package
diff --git a/src/Composer/Installer/LibraryInstaller.php b/src/Composer/Installer/LibraryInstaller.php
index bef93cf55..baff5fdeb 100644
--- a/src/Composer/Installer/LibraryInstaller.php
+++ b/src/Composer/Installer/LibraryInstaller.php
@@ -30,7 +30,6 @@ class LibraryInstaller implements InstallerInterface
     protected $vendorDir;
     protected $binDir;
     protected $downloadManager;
-    protected $repository;
     protected $io;
     private $type;
     private $filesystem;
@@ -41,14 +40,12 @@ class LibraryInstaller implements InstallerInterface
      * @param   string                      $vendorDir  relative path for packages home
      * @param   string                      $binDir     relative path for binaries
      * @param   DownloadManager             $dm         download manager
-     * @param   WritableRepositoryInterface $repository repository controller
      * @param   IOInterface                 $io         io instance
      * @param   string                      $type       package type that this installer handles
      */
-    public function __construct($vendorDir, $binDir, DownloadManager $dm, WritableRepositoryInterface $repository, IOInterface $io, $type = 'library')
+    public function __construct($vendorDir, $binDir, DownloadManager $dm, IOInterface $io, $type = 'library')
     {
         $this->downloadManager = $dm;
-        $this->repository = $repository;
         $this->io = $io;
         $this->type = $type;
 
@@ -68,37 +65,37 @@ class LibraryInstaller implements InstallerInterface
     /**
      * {@inheritDoc}
      */
-    public function isInstalled(PackageInterface $package)
+    public function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package)
     {
-        return $this->repository->hasPackage($package) && is_readable($this->getInstallPath($package));
+        return $repo->hasPackage($package) && is_readable($this->getInstallPath($package));
     }
 
     /**
      * {@inheritDoc}
      */
-    public function install(PackageInterface $package)
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package)
     {
         $this->initializeVendorDir();
         $downloadPath = $this->getInstallPath($package);
 
         // remove the binaries if it appears the package files are missing
-        if (!is_readable($downloadPath) && $this->repository->hasPackage($package)) {
+        if (!is_readable($downloadPath) && $repo->hasPackage($package)) {
             $this->removeBinaries($package);
         }
 
         $this->downloadManager->download($package, $downloadPath);
         $this->installBinaries($package);
-        if (!$this->repository->hasPackage($package)) {
-            $this->repository->addPackage(clone $package);
+        if (!$repo->hasPackage($package)) {
+            $repo->addPackage(clone $package);
         }
     }
 
     /**
      * {@inheritDoc}
      */
-    public function update(PackageInterface $initial, PackageInterface $target)
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
     {
-        if (!$this->repository->hasPackage($initial)) {
+        if (!$repo->hasPackage($initial)) {
             throw new \InvalidArgumentException('Package is not installed: '.$initial);
         }
 
@@ -108,18 +105,18 @@ class LibraryInstaller implements InstallerInterface
         $this->removeBinaries($initial);
         $this->downloadManager->update($initial, $target, $downloadPath);
         $this->installBinaries($target);
-        $this->repository->removePackage($initial);
-        if (!$this->repository->hasPackage($target)) {
-            $this->repository->addPackage(clone $target);
+        $repo->removePackage($initial);
+        if (!$repo->hasPackage($target)) {
+            $repo->addPackage(clone $target);
         }
     }
 
     /**
      * {@inheritDoc}
      */
-    public function uninstall(PackageInterface $package)
+    public function uninstall(WritableRepositoryInterface $repo, PackageInterface $package)
     {
-        if (!$this->repository->hasPackage($package)) {
+        if (!$repo->hasPackage($package)) {
             // TODO throw exception again here, when update is fixed and we don't have to remove+install (see #125)
             return;
             throw new \InvalidArgumentException('Package is not installed: '.$package);
@@ -129,7 +126,7 @@ class LibraryInstaller implements InstallerInterface
 
         $this->downloadManager->remove($package, $downloadPath);
         $this->removeBinaries($package);
-        $this->repository->removePackage($package);
+        $repo->removePackage($package);
     }
 
     /**
@@ -138,6 +135,7 @@ class LibraryInstaller implements InstallerInterface
     public function getInstallPath(PackageInterface $package)
     {
         $targetDir = $package->getTargetDir();
+
         return ($this->vendorDir ? $this->vendorDir.'/' : '') . $package->getPrettyName() . ($targetDir ? '/'.$targetDir : '');
     }
 
diff --git a/src/Composer/Installer/MetapackageInstaller.php b/src/Composer/Installer/MetapackageInstaller.php
index ceee0f1a3..9dcdbd3d0 100644
--- a/src/Composer/Installer/MetapackageInstaller.php
+++ b/src/Composer/Installer/MetapackageInstaller.php
@@ -12,7 +12,6 @@
 
 namespace Composer\Installer;
 
-use Composer\IO\IOInterface;
 use Composer\Repository\WritableRepositoryInterface;
 use Composer\Package\PackageInterface;
 
@@ -23,19 +22,6 @@ use Composer\Package\PackageInterface;
  */
 class MetapackageInstaller implements InstallerInterface
 {
-    protected $repository;
-    protected $io;
-
-    /**
-     * @param   WritableRepositoryInterface $repository repository controller
-     * @param   IOInterface                 $io         io instance
-     */
-    public function __construct(WritableRepositoryInterface $repository, IOInterface $io)
-    {
-        $this->repository = $repository;
-        $this->io = $io;
-    }
-
     /**
      * {@inheritDoc}
      */
@@ -47,44 +33,44 @@ class MetapackageInstaller implements InstallerInterface
     /**
      * {@inheritDoc}
      */
-    public function isInstalled(PackageInterface $package)
+    public function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package)
     {
-        return $this->repository->hasPackage($package);
+        return $repo->hasPackage($package);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function install(PackageInterface $package)
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package)
     {
-        $this->repository->addPackage(clone $package);
+        $repo->addPackage(clone $package);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function update(PackageInterface $initial, PackageInterface $target)
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
     {
-        if (!$this->repository->hasPackage($initial)) {
+        if (!$repo->hasPackage($initial)) {
             throw new \InvalidArgumentException('Package is not installed: '.$initial);
         }
 
-        $this->repository->removePackage($initial);
-        $this->repository->addPackage(clone $target);
+        $repo->removePackage($initial);
+        $repo->addPackage(clone $target);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function uninstall(PackageInterface $package)
+    public function uninstall(WritableRepositoryInterface $repo, PackageInterface $package)
     {
-        if (!$this->repository->hasPackage($package)) {
+        if (!$repo->hasPackage($package)) {
             // TODO throw exception again here, when update is fixed and we don't have to remove+install (see #125)
             return;
             throw new \InvalidArgumentException('Package is not installed: '.$package);
         }
 
-        $this->repository->removePackage($package);
+        $repo->removePackage($package);
     }
 
     /**
diff --git a/src/Composer/Package/Locker.php b/src/Composer/Package/Locker.php
index cc5112835..5f11e419d 100644
--- a/src/Composer/Package/Locker.php
+++ b/src/Composer/Package/Locker.php
@@ -69,13 +69,17 @@ class Locker
      *
      * @return array
      */
-    public function getLockedPackages()
+    public function getLockedPackages($dev = false)
     {
         $lockList = $this->getLockData();
         $packages = array();
-        foreach ($lockList['packages'] as $info) {
+
+        $lockedPackages = $dev ? $lockList['packages-dev'] : $lockList['packages'];
+        $repo = $dev ? $this->repositoryManager->getLocalDevRepository() : $this->repositoryManager->getLocalRepository();
+
+        foreach ($lockedPackages as $info) {
             $resolvedVersion = !empty($info['alias']) ? $info['alias'] : $info['version'];
-            $package = $this->repositoryManager->getLocalRepository()->findPackage($info['package'], $resolvedVersion);
+            $package = $repo->findPackage($info['package'], $resolvedVersion);
 
             if (!$package) {
                 $package = $this->repositoryManager->findPackage($info['package'], $info['version']);
@@ -120,18 +124,37 @@ class Locker
      * Locks provided data into lockfile.
      *
      * @param array $packages array of packages
+     * @param array $packages array of dev packages
      * @param array $aliases array of aliases
      *
      * @return Boolean
      */
-    public function setLockData(array $packages, array $aliases)
+    public function setLockData(array $packages, array $devPackages, array $aliases)
     {
         $lock = array(
             'hash' => $this->hash,
             'packages' => array(),
+            'packages-dev' => array(),
             'aliases' => $aliases,
         );
 
+        $lock['packages'] = $this->lockPackages($packages);
+        $lock['packages-dev'] = $this->lockPackages($devPackages);
+
+        if (!$this->isLocked() || $lock !== $this->getLockData()) {
+            $this->lockFile->write($lock);
+            $this->lockDataCache = null;
+
+            return true;
+        }
+
+        return false;
+    }
+
+    private function lockPackages(array $packages)
+    {
+        $locked = array();
+
         foreach ($packages as $package) {
             $name    = $package->getPrettyName();
             $version = $package->getPrettyVersion();
@@ -152,20 +175,13 @@ class Locker
                 $spec['alias'] = $package->getAlias();
             }
 
-            $lock['packages'][] = $spec;
+            $locked[] = $spec;
         }
 
-        usort($lock['packages'], function ($a, $b) {
+        usort($locked, function ($a, $b) {
             return strcmp($a['package'], $b['package']);
         });
 
-        if (!$this->isLocked() || $lock !== $this->getLockData()) {
-            $this->lockFile->write($lock);
-            $this->lockDataCache = null;
-
-            return true;
-        }
-
-        return false;
+        return $locked;
     }
 }
diff --git a/src/Composer/Repository/RepositoryManager.php b/src/Composer/Repository/RepositoryManager.php
index 8dd684082..febce81a3 100644
--- a/src/Composer/Repository/RepositoryManager.php
+++ b/src/Composer/Repository/RepositoryManager.php
@@ -25,6 +25,7 @@ use Composer\Config;
 class RepositoryManager
 {
     private $localRepository;
+    private $localDevRepository;
     private $repositories = array();
     private $repositoryClasses = array();
     private $io;
@@ -140,4 +141,34 @@ class RepositoryManager
     {
         return $this->localRepository;
     }
+
+    /**
+     * Sets localDev repository for the project.
+     *
+     * @param   RepositoryInterface $repository repository instance
+     */
+    public function setLocalDevRepository(RepositoryInterface $repository)
+    {
+        $this->localDevRepository = $repository;
+    }
+
+    /**
+     * Returns localDev repository for the project.
+     *
+     * @return  RepositoryInterface
+     */
+    public function getLocalDevRepository()
+    {
+        return $this->localDevRepository;
+    }
+
+    /**
+     * Returns all local repositories for the project.
+     *
+     * @return  array[RepositoryInterface]
+     */
+    public function getLocalRepositories()
+    {
+        return array($this->localRepository, $this->localDevRepository);
+    }
 }
diff --git a/tests/Composer/Test/Installer/Fixtures/installer-v1/Installer/Custom.php b/tests/Composer/Test/Installer/Fixtures/installer-v1/Installer/Custom.php
index 4bb58ded8..cfda3c3d3 100644
--- a/tests/Composer/Test/Installer/Fixtures/installer-v1/Installer/Custom.php
+++ b/tests/Composer/Test/Installer/Fixtures/installer-v1/Installer/Custom.php
@@ -4,15 +4,16 @@ namespace Installer;
 
 use Composer\Installer\InstallerInterface;
 use Composer\Package\PackageInterface;
+use Composer\Repository\WritableRepositoryInterface;
 
 class Custom implements InstallerInterface
 {
     public $version = 'installer-v1';
 
     public function supports($packageType) {}
-    public function isInstalled(PackageInterface $package) {}
-    public function install(PackageInterface $package) {}
-    public function update(PackageInterface $initial, PackageInterface $target) {}
-    public function uninstall(PackageInterface $package) {}
+    public function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target) {}
+    public function uninstall(WritableRepositoryInterface $repo, PackageInterface $package) {}
     public function getInstallPath(PackageInterface $package) {}
 }
diff --git a/tests/Composer/Test/Installer/Fixtures/installer-v2/Installer/Custom2.php b/tests/Composer/Test/Installer/Fixtures/installer-v2/Installer/Custom2.php
index edd264428..52f46371b 100644
--- a/tests/Composer/Test/Installer/Fixtures/installer-v2/Installer/Custom2.php
+++ b/tests/Composer/Test/Installer/Fixtures/installer-v2/Installer/Custom2.php
@@ -4,15 +4,16 @@ namespace Installer;
 
 use Composer\Installer\InstallerInterface;
 use Composer\Package\PackageInterface;
+use Composer\Repository\WritableRepositoryInterface;
 
 class Custom2 implements InstallerInterface
 {
     public $version = 'installer-v2';
 
     public function supports($packageType) {}
-    public function isInstalled(PackageInterface $package) {}
-    public function install(PackageInterface $package) {}
-    public function update(PackageInterface $initial, PackageInterface $target) {}
-    public function uninstall(PackageInterface $package) {}
+    public function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target) {}
+    public function uninstall(WritableRepositoryInterface $repo, PackageInterface $package) {}
     public function getInstallPath(PackageInterface $package) {}
 }
diff --git a/tests/Composer/Test/Installer/Fixtures/installer-v3/Installer/Custom2.php b/tests/Composer/Test/Installer/Fixtures/installer-v3/Installer/Custom2.php
index db211bed5..ca8ad7897 100644
--- a/tests/Composer/Test/Installer/Fixtures/installer-v3/Installer/Custom2.php
+++ b/tests/Composer/Test/Installer/Fixtures/installer-v3/Installer/Custom2.php
@@ -4,15 +4,16 @@ namespace Installer;
 
 use Composer\Installer\InstallerInterface;
 use Composer\Package\PackageInterface;
+use Composer\Repository\WritableRepositoryInterface;
 
 class Custom2 implements InstallerInterface
 {
     public $version = 'installer-v3';
 
     public function supports($packageType) {}
-    public function isInstalled(PackageInterface $package) {}
-    public function install(PackageInterface $package) {}
-    public function update(PackageInterface $initial, PackageInterface $target) {}
-    public function uninstall(PackageInterface $package) {}
+    public function isInstalled(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function install(WritableRepositoryInterface $repo, PackageInterface $package) {}
+    public function update(WritableRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target) {}
+    public function uninstall(WritableRepositoryInterface $repo, PackageInterface $package) {}
     public function getInstallPath(PackageInterface $package) {}
 }
diff --git a/tests/Composer/Test/Installer/InstallationManagerTest.php b/tests/Composer/Test/Installer/InstallationManagerTest.php
index 941157a29..f14c08c84 100644
--- a/tests/Composer/Test/Installer/InstallationManagerTest.php
+++ b/tests/Composer/Test/Installer/InstallationManagerTest.php
@@ -19,6 +19,11 @@ use Composer\DependencyResolver\Operation\UninstallOperation;
 
 class InstallationManagerTest extends \PHPUnit_Framework_TestCase
 {
+    public function setUp()
+    {
+        $this->repository = $this->getMock('Composer\Repository\WritableRepositoryInterface');
+    }
+
     public function testVendorDirOutsideTheWorkingDir()
     {
         $manager = new InstallationManager(realpath(getcwd().'/../'));
@@ -67,22 +72,23 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
             $this->createPackageMock(), $this->createPackageMock()
         );
 
+
         $manager
             ->expects($this->once())
             ->method('install')
-            ->with($installOperation);
+            ->with($this->repository, $installOperation);
         $manager
             ->expects($this->once())
             ->method('uninstall')
-            ->with($removeOperation);
+            ->with($this->repository, $removeOperation);
         $manager
             ->expects($this->once())
             ->method('update')
-            ->with($updateOperation);
+            ->with($this->repository, $updateOperation);
 
-        $manager->execute($installOperation);
-        $manager->execute($removeOperation);
-        $manager->execute($updateOperation);
+        $manager->execute($this->repository, $installOperation);
+        $manager->execute($this->repository, $removeOperation);
+        $manager->execute($this->repository, $updateOperation);
     }
 
     public function testInstall()
@@ -108,9 +114,9 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
         $installer
             ->expects($this->once())
             ->method('install')
-            ->with($package);
+            ->with($this->repository, $package);
 
-        $manager->install($operation);
+        $manager->install($this->repository, $operation);
     }
 
     public function testUpdateWithEqualTypes()
@@ -141,9 +147,9 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
         $installer
             ->expects($this->once())
             ->method('update')
-            ->with($initial, $target);
+            ->with($this->repository, $initial, $target);
 
-        $manager->update($operation);
+        $manager->update($this->repository, $operation);
     }
 
     public function testUpdateWithNotEqualTypes()
@@ -183,14 +189,14 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
         $libInstaller
             ->expects($this->once())
             ->method('uninstall')
-            ->with($initial);
+            ->with($this->repository, $initial);
 
         $bundleInstaller
             ->expects($this->once())
             ->method('install')
-            ->with($target);
+            ->with($this->repository, $target);
 
-        $manager->update($operation);
+        $manager->update($this->repository, $operation);
     }
 
     public function testUninstall()
@@ -210,7 +216,7 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
         $installer
             ->expects($this->once())
             ->method('uninstall')
-            ->with($package);
+            ->with($this->repository, $package);
 
         $installer
             ->expects($this->once())
@@ -218,7 +224,7 @@ class InstallationManagerTest extends \PHPUnit_Framework_TestCase
             ->with('library')
             ->will($this->returnValue(true));
 
-        $manager->uninstall($operation);
+        $manager->uninstall($this->repository, $operation);
     }
 
     public function testGetVendorPathAbsolute()
diff --git a/tests/Composer/Test/Installer/InstallerInstallerTest.php b/tests/Composer/Test/Installer/InstallerInstallerTest.php
index eab2d948a..2c107c32c 100644
--- a/tests/Composer/Test/Installer/InstallerInstallerTest.php
+++ b/tests/Composer/Test/Installer/InstallerInstallerTest.php
@@ -34,11 +34,9 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
             ->disableOriginalConstructor()
             ->getMock();
 
-        $this->repository = $this->getMockBuilder('Composer\Repository\WritableRepositoryInterface')
-            ->getMock();
+        $this->repository = $this->getMock('Composer\Repository\WritableRepositoryInterface');
 
-        $this->io = $this->getMockBuilder('Composer\IO\IOInterface')
-            ->getMock();
+        $this->io = $this->getMock('Composer\IO\IOInterface');
     }
 
     public function testInstallNewInstaller()
@@ -47,7 +45,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
             ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array()));
-        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->repository, $this->io, $this->im);
+        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->io, $this->im, array($this->repository));
 
         $test = $this;
         $this->im
@@ -57,7 +55,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
                 $test->assertEquals('installer-v1', $installer->version);
             }));
 
-        $installer->install($this->packages[0]);
+        $installer->install($this->repository, $this->packages[0]);
     }
 
     public function testUpgradeWithNewClassName()
@@ -70,7 +68,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
             ->expects($this->exactly(2))
             ->method('hasPackage')
             ->will($this->onConsecutiveCalls(true, false));
-        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->repository, $this->io, $this->im);
+        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->io, $this->im, array($this->repository));
 
         $test = $this;
         $this->im
@@ -80,7 +78,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
                 $test->assertEquals('installer-v2', $installer->version);
             }));
 
-        $installer->update($this->packages[0], $this->packages[1]);
+        $installer->update($this->repository, $this->packages[0], $this->packages[1]);
     }
 
     public function testUpgradeWithSameClassName()
@@ -93,7 +91,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
             ->expects($this->exactly(2))
             ->method('hasPackage')
             ->will($this->onConsecutiveCalls(true, false));
-        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->repository, $this->io, $this->im);
+        $installer = new InstallerInstallerMock(__DIR__.'/Fixtures/', __DIR__.'/Fixtures/bin', $this->dm, $this->io, $this->im, array($this->repository));
 
         $test = $this;
         $this->im
@@ -103,7 +101,7 @@ class InstallerInstallerTest extends \PHPUnit_Framework_TestCase
                 $test->assertEquals('installer-v3', $installer->version);
             }));
 
-        $installer->update($this->packages[1], $this->packages[2]);
+        $installer->update($this->repository, $this->packages[1], $this->packages[2]);
     }
 }
 
diff --git a/tests/Composer/Test/Installer/LibraryInstallerTest.php b/tests/Composer/Test/Installer/LibraryInstallerTest.php
index 100ebb60e..7983cf2a2 100644
--- a/tests/Composer/Test/Installer/LibraryInstallerTest.php
+++ b/tests/Composer/Test/Installer/LibraryInstallerTest.php
@@ -40,11 +40,9 @@ class LibraryInstallerTest extends TestCase
             ->disableOriginalConstructor()
             ->getMock();
 
-        $this->repository = $this->getMockBuilder('Composer\Repository\WritableRepositoryInterface')
-            ->getMock();
+        $this->repository = $this->getMock('Composer\Repository\WritableRepositoryInterface');
 
-        $this->io = $this->getMockBuilder('Composer\IO\IOInterface')
-            ->getMock();
+        $this->io = $this->getMock('Composer\IO\IOInterface');
     }
 
     protected function tearDown()
@@ -57,7 +55,7 @@ class LibraryInstallerTest extends TestCase
     {
         $this->fs->removeDirectory($this->vendorDir);
 
-        new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $this->assertFileNotExists($this->vendorDir);
     }
 
@@ -65,13 +63,13 @@ class LibraryInstallerTest extends TestCase
     {
         $this->fs->removeDirectory($this->binDir);
 
-        new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $this->assertFileNotExists($this->binDir);
     }
 
     public function testIsInstalled()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $package = $this->createPackageMock();
 
         $this->repository
@@ -80,8 +78,8 @@ class LibraryInstallerTest extends TestCase
             ->with($package)
             ->will($this->onConsecutiveCalls(true, false));
 
-        $this->assertTrue($library->isInstalled($package));
-        $this->assertFalse($library->isInstalled($package));
+        $this->assertTrue($library->isInstalled($this->repository, $package));
+        $this->assertFalse($library->isInstalled($this->repository, $package));
     }
 
     /**
@@ -90,7 +88,7 @@ class LibraryInstallerTest extends TestCase
      */
     public function testInstall()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $package = $this->createPackageMock();
 
         $package
@@ -108,7 +106,7 @@ class LibraryInstallerTest extends TestCase
             ->method('addPackage')
             ->with($package);
 
-        $library->install($package);
+        $library->install($this->repository, $package);
         $this->assertFileExists($this->vendorDir, 'Vendor dir should be created');
         $this->assertFileExists($this->binDir, 'Bin dir should be created');
     }
@@ -119,7 +117,7 @@ class LibraryInstallerTest extends TestCase
      */
     public function testUpdate()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $initial = $this->createPackageMock();
         $target  = $this->createPackageMock();
 
@@ -148,18 +146,18 @@ class LibraryInstallerTest extends TestCase
             ->method('addPackage')
             ->with($target);
 
-        $library->update($initial, $target);
+        $library->update($this->repository, $initial, $target);
         $this->assertFileExists($this->vendorDir, 'Vendor dir should be created');
         $this->assertFileExists($this->binDir, 'Bin dir should be created');
 
         $this->setExpectedException('InvalidArgumentException');
 
-        $library->update($initial, $target);
+        $library->update($this->repository, $initial, $target);
     }
 
     public function testUninstall()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $package = $this->createPackageMock();
 
         $package
@@ -183,17 +181,17 @@ class LibraryInstallerTest extends TestCase
             ->method('removePackage')
             ->with($package);
 
-        $library->uninstall($package);
+        $library->uninstall($this->repository, $package);
 
         // TODO re-enable once #125 is fixed and we throw exceptions again
 //        $this->setExpectedException('InvalidArgumentException');
 
-        $library->uninstall($package);
+        $library->uninstall($this->repository, $package);
     }
 
     public function testGetInstallPath()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $package = $this->createPackageMock();
 
         $package
@@ -206,7 +204,7 @@ class LibraryInstallerTest extends TestCase
 
     public function testGetInstallPathWithTargetDir()
     {
-        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->repository, $this->io);
+        $library = new LibraryInstaller($this->vendorDir, $this->binDir, $this->dm, $this->io);
         $package = $this->createPackageMock();
 
         $package
diff --git a/tests/Composer/Test/Installer/MetapackageInstallerTest.php b/tests/Composer/Test/Installer/MetapackageInstallerTest.php
index fd71eb1b6..45d1ff605 100644
--- a/tests/Composer/Test/Installer/MetapackageInstallerTest.php
+++ b/tests/Composer/Test/Installer/MetapackageInstallerTest.php
@@ -26,7 +26,7 @@ class MetapackageInstallerTest extends \PHPUnit_Framework_TestCase
 
         $this->io = $this->getMock('Composer\IO\IOInterface');
 
-        $this->installer = new MetapackageInstaller($this->repository, $this->io);
+        $this->installer = new MetapackageInstaller();
     }
 
     public function testInstall()
@@ -38,7 +38,7 @@ class MetapackageInstallerTest extends \PHPUnit_Framework_TestCase
             ->method('addPackage')
             ->with($package);
 
-        $this->installer->install($package);
+        $this->installer->install($this->repository, $package);
     }
 
     public function testUpdate()
@@ -62,11 +62,11 @@ class MetapackageInstallerTest extends \PHPUnit_Framework_TestCase
             ->method('addPackage')
             ->with($target);
 
-        $this->installer->update($initial, $target);
+        $this->installer->update($this->repository, $initial, $target);
 
         $this->setExpectedException('InvalidArgumentException');
 
-        $this->installer->update($initial, $target);
+        $this->installer->update($this->repository, $initial, $target);
     }
 
     public function testUninstall()
@@ -84,12 +84,12 @@ class MetapackageInstallerTest extends \PHPUnit_Framework_TestCase
             ->method('removePackage')
             ->with($package);
 
-        $this->installer->uninstall($package);
+        $this->installer->uninstall($this->repository, $package);
 
         // TODO re-enable once #125 is fixed and we throw exceptions again
 //        $this->setExpectedException('InvalidArgumentException');
 
-        $this->installer->uninstall($package);
+        $this->installer->uninstall($this->repository, $package);
     }
 
     private function createPackageMock()
diff --git a/tests/Composer/Test/Package/LockerTest.php b/tests/Composer/Test/Package/LockerTest.php
index 9c3f3cbe0..a4cbb6e1d 100644
--- a/tests/Composer/Test/Package/LockerTest.php
+++ b/tests/Composer/Test/Package/LockerTest.php
@@ -151,10 +151,11 @@ class LockerTest extends \PHPUnit_Framework_TestCase
                     array('package' => 'pkg1', 'version' => '1.0.0-beta'),
                     array('package' => 'pkg2', 'version' => '0.1.10')
                 ),
+                'packages-dev' => array(),
                 'aliases' => array(),
             ));
 
-        $locker->setLockData(array($package1, $package2), array());
+        $locker->setLockData(array($package1, $package2), array(), array());
     }
 
     public function testLockBadPackages()
@@ -172,7 +173,7 @@ class LockerTest extends \PHPUnit_Framework_TestCase
 
         $this->setExpectedException('LogicException');
 
-        $locker->setLockData(array($package1), array());
+        $locker->setLockData(array($package1), array(), array());
     }
 
     public function testIsFresh()