diff --git a/advagg_js_compress/advagg_js_compress.install b/advagg_js_compress/advagg_js_compress.install
index 4e24d7e..e8269b9 100644
--- a/advagg_js_compress/advagg_js_compress.install
+++ b/advagg_js_compress/advagg_js_compress.install
@@ -49,6 +49,41 @@ function advagg_js_compress_requirements($phase) {
     }
   }
 
+  // Check locale and jsmin version.
+  if ( function_exists('jsmin')
+    && defined('PHP_VERSION_ID')
+    && constant('PHP_VERSION_ID') >= 50310
+  ) {
+    // Check versions.
+    $request = drupal_http_request('https://cdn.rawgit.com/sqmk/pecl-jsmin/master/package.xml', array('timeout' => 10, 'headers' => array('Connection' => 'close',)));
+    if (!empty($request->data) && $request->code == 200) {
+      $string = $request->data;
+      $dom = new DOMDocument();
+      $dom->loadXML($string);
+      $items = $dom->getElementsByTagName('release');
+      $github_version = 0;
+      foreach ($items as $item) {
+        if (!empty($item->nodeValue) && preg_match("/[0-9]+/", $item->nodeValue)) {
+          $github_version = $item->nodeValue;
+          break;
+        }
+      }
+      $jsmin_version = phpversion('jsmin');
+      if (!empty($jsmin_version) && !empty($github_version) && version_compare($jsmin_version, $github_version, '<')) {
+        $requirements['advagg_js_compress_jsmin_version'] = array(
+          'title' => $t('AdvAgg JS Compressor'),
+          'severity' => REQUIREMENT_WARNING,
+          'value' => $t('jsmin should be upgraded.'),
+          'description' => $t('There is a newer version of <a href="@url">jsmin</a> available. Server version: @server, Git hub version: @github', array(
+            '@url' => 'https://github.com/sqmk/pecl-jsmin',
+            '@server' => $jsmin_version,
+            '@github' => $github_version,
+          )),
+        );
+      }
+    }
+  }
+
   return $requirements;
 }