diff --git a/composer.json b/composer.json
index c62dbe7..fc67587 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,6 @@
 
     "require" : {
         "php"                      : ">=5.3.3",
-        "symfony/config"           : "^2.2|^3.0",
         "symfony/event-dispatcher" : "^2.2|^3.0"
     },
 
diff --git a/src/Lurker/Resource/DirectoryResource.php b/src/Lurker/Resource/DirectoryResource.php
index 1444c94..3de001f 100644
--- a/src/Lurker/Resource/DirectoryResource.php
+++ b/src/Lurker/Resource/DirectoryResource.php
@@ -2,13 +2,60 @@
 
 namespace Lurker\Resource;
 
-use Symfony\Component\Config\Resource\DirectoryResource as BaseDirectoryResource;
+use Lurker\Exception\InvalidArgumentException;
 
 /**
  * @package Lurker
  */
-class DirectoryResource extends BaseDirectoryResource implements ResourceInterface
+class DirectoryResource implements ResourceInterface
 {
+    /**
+     * @var string
+     */
+    private $resource;
+
+    /**
+     * @var string|null
+     */
+    private $pattern;
+
+    /**
+     * @param string $resource
+     * @param string|null $pattern
+     */
+    public function __construct($resource, $pattern = null)
+    {
+        $this->resource = realpath($resource);
+        $this->pattern = $pattern;
+
+        if (false === $this->resource || !is_dir($this->resource)) {
+            throw new InvalidArgumentException(sprintf('The directory "%s" does not exist.', $resource));
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function getResource()
+    {
+        return $this->resource;
+    }
+
+    /**
+     * @return string
+     */
+    public function getPattern()
+    {
+        return $this->pattern;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return md5(serialize(array($this->resource, $this->pattern)));
+    }
 
     public function exists()
     {
diff --git a/src/Lurker/Resource/FileResource.php b/src/Lurker/Resource/FileResource.php
index 5e1798f..ac595e9 100644
--- a/src/Lurker/Resource/FileResource.php
+++ b/src/Lurker/Resource/FileResource.php
@@ -2,13 +2,50 @@
 
 namespace Lurker\Resource;
 
-use Symfony\Component\Config\Resource\FileResource as BaseFileResource;
+use Lurker\Exception\InvalidArgumentException;
 
 /**
  * @package Lurker
  */
-class FileResource extends BaseFileResource implements ResourceInterface
+class FileResource implements ResourceInterface
 {
+    /**
+     * @var string
+     */
+    private $resource;
+
+    /**
+     * @param string $resource
+     */
+    public function __construct($resource)
+    {
+        $this->resource = realpath($resource);
+
+        if (false === $this->resource && file_exists($resource)) {
+            $this->resource = $resource;
+        }
+
+        if (false === $this->resource) {
+            throw new InvalidArgumentException(sprintf('The file "%s" does not exist.', $resource));
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function getResource()
+    {
+        return $this->resource;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->resource;
+    }
+
     public function getModificationTime()
     {
         if (!$this->exists()) {
diff --git a/src/Lurker/Resource/ResourceInterface.php b/src/Lurker/Resource/ResourceInterface.php
index fe0a888..776461e 100644
--- a/src/Lurker/Resource/ResourceInterface.php
+++ b/src/Lurker/Resource/ResourceInterface.php
@@ -2,12 +2,10 @@
 
 namespace Lurker\Resource;
 
-use Symfony\Component\Config\Resource\ResourceInterface as BaseResourceInterface;
-
 /**
  * @package Lurker
  */
-interface ResourceInterface extends BaseResourceInterface
+interface ResourceInterface
 {
     /**
      * @return boolean