diff --git a/src/Composer/Package/Loader/ArrayLoader.php b/src/Composer/Package/Loader/ArrayLoader.php
index 6d6f4f15d..7c992392c 100644
--- a/src/Composer/Package/Loader/ArrayLoader.php
+++ b/src/Composer/Package/Loader/ArrayLoader.php
@@ -122,6 +122,8 @@ class ArrayLoader
             $package->setSourceType($config['source']['type']);
             $package->setSourceUrl($config['source']['url']);
             $package->setSourceReference($config['source']['reference']);
+        } elseif ($package->isDev()) {
+            throw new \UnexpectedValueException('Dev package '.$package.' must have a source specified');
         }
 
         if (isset($config['dist'])) {
diff --git a/src/Composer/Package/Loader/RootPackageLoader.php b/src/Composer/Package/Loader/RootPackageLoader.php
index 294dd3f42..208bc4fcf 100644
--- a/src/Composer/Package/Loader/RootPackageLoader.php
+++ b/src/Composer/Package/Loader/RootPackageLoader.php
@@ -38,7 +38,7 @@ class RootPackageLoader extends ArrayLoader
             $config['name'] = '__root__';
         }
         if (!isset($config['version'])) {
-            $config['version'] = '1.0.0-dev';
+            $config['version'] = '1.0.0';
         }
 
         $package = parent::load($config);