diff --git a/composer.json b/composer.json
index 4018174..0063d15 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,8 @@
     "type": "library",
     "keywords": ["deployment"],
     "require": {
-        "php": ">=5.3"
+        "php": ">=5.3",
+        "symfony/filesystem": ">=2.1.0,<=2.6.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..54108f8
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,66 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "This file is @generated automatically"
+    ],
+    "hash": "e7a3fa9a09b1ab45ed140d6813a94262",
+    "packages": [
+        {
+            "name": "symfony/filesystem",
+            "version": "v2.5.6",
+            "target-dir": "Symfony/Component/Filesystem",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Filesystem.git",
+                "reference": "4e62fab0060a826561c78b665925b37c870c45f5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/Filesystem/zipball/4e62fab0060a826561c78b665925b37c870c45f5",
+                "reference": "4e62fab0060a826561c78b665925b37c870c45f5",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.5-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Filesystem\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                },
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                }
+            ],
+            "description": "Symfony Filesystem Component",
+            "homepage": "http://symfony.com",
+            "time": "2014-09-22 09:14:18"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "platform": {
+        "php": ">=5.3"
+    },
+    "platform-dev": []
+}