diff --git a/src/Composer/Command/RemoveCommand.php b/src/Composer/Command/RemoveCommand.php
index 8ab9cd35f..771f7b042 100644
--- a/src/Composer/Command/RemoveCommand.php
+++ b/src/Composer/Command/RemoveCommand.php
@@ -97,6 +97,7 @@ EOT
         }
 
         // Update packages
+        $this->resetComposer();
         $composer = $this->getComposer(true, $input->getOption('no-plugins'));
         $composer->getDownloadManager()->setOutputProgress(!$input->getOption('no-progress'));
 
diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index b433b6fcc..320a48994 100644
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -189,7 +189,7 @@ class Application extends BaseApplication
             }
 
             // Check system temp folder for usability as it can cause weird runtime issues otherwise
-            Silencer::call(function() {
+            Silencer::call(function () use ($io) {
                 $tempfile = sys_get_temp_dir() . '/temp-' . md5(microtime());
                 if (!(file_put_contents($tempfile, __FILE__) && (file_get_contents($tempfile) == __FILE__) && unlink($tempfile) && !file_exists($tempfile))) {
                     $io->writeError(sprintf('<error>PHP temp directory (%s) does not exist or is not writable to Composer. Set sys_temp_dir in your php.ini</error>', sys_get_temp_dir()));
diff --git a/src/Composer/Package/Loader/ValidatingArrayLoader.php b/src/Composer/Package/Loader/ValidatingArrayLoader.php
index 9fa0ef0dd..38fc9fe7c 100644
--- a/src/Composer/Package/Loader/ValidatingArrayLoader.php
+++ b/src/Composer/Package/Loader/ValidatingArrayLoader.php
@@ -151,6 +151,7 @@ class ValidatingArrayLoader implements LoaderInterface
         }
 
         $unboundConstraint = new Constraint('=', $this->versionParser->normalize('dev-master'));
+        $stableConstraint = new Constraint('=', '1.0.0');
 
         foreach (array_keys(BasePackage::$supportedLinkTypes) as $linkType) {
             if ($this->validateArray($linkType) && isset($this->config[$linkType])) {
@@ -183,6 +184,7 @@ class ValidatingArrayLoader implements LoaderInterface
                             ($this->flags & self::CHECK_STRICT_CONSTRAINTS)
                             && 'require' === $linkType
                             && substr($linkConstraint, 0, 1) === '='
+                            && $stableConstraint->versionCompare($stableConstraint, $linkConstraint, '<=')
                         ) {
                             $this->warnings[] = $linkType.'.'.$package.' : exact version constraints ('.$constraint.') should be avoided if the package follows semantic versioning';
                         }
diff --git a/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php b/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
index 7027b033b..983d99862 100644
--- a/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
+++ b/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
@@ -327,6 +327,18 @@ class ValidatingArrayLoaderTest extends \PHPUnit_Framework_TestCase
                 ),
                 false,
             ),
+            array(
+                array(
+                    'name' => 'foo/bar',
+                    'require' => array(
+                        'bar/unstable' => '0.3.0',
+                    ),
+                ),
+                array(
+                    // using an exact version constraint for an unstable version should not trigger a warning
+                ),
+                false,
+            ),
             array(
                 array(
                     'name' => 'foo/bar',