diff --git a/src/Traits/GenUid.php b/src/Traits/GenUid.php
index aed8d1d..295599e 100644
--- a/src/Traits/GenUid.php
+++ b/src/Traits/GenUid.php
@@ -43,7 +43,7 @@ public function getKeyType()
      * @param int $limit
      * @return false|string
      */
-    public function uid($limit = 9)
+    public function uid($limit = 16)
     {
         return substr(base_convert(sha1(uniqid(mt_rand())), 16, 36), 0, $limit);
     }