diff --git a/composer.json b/composer.json
index 8740ee18e..bee910c20 100644
--- a/composer.json
+++ b/composer.json
@@ -50,7 +50,7 @@
         "symfony/var-dumper": "^3.3"
     },
     "require-dev": {
-        "codeception/codeception": "^2.4",
+        "codeception/codeception": "2.4.*",
         "friendsofphp/php-cs-fixer": "^2.10"
     },
     "autoload": {
diff --git a/include/src/Model.php b/include/src/Model.php
index de3e1f5c0..5eac30ae5 100644
--- a/include/src/Model.php
+++ b/include/src/Model.php
@@ -6,6 +6,8 @@ use Illuminate\Database\Eloquent\Model as Original;
 
 abstract class Model extends Original
 {
+    const UPDATED_AT = null;
+
     /**
      * Crea una nuova istanza del modello.
      *
diff --git a/src/Intl/Formatter.php b/src/Intl/Formatter.php
index 12b145a15..16c22b0fd 100644
--- a/src/Intl/Formatter.php
+++ b/src/Intl/Formatter.php
@@ -151,10 +151,23 @@ class Formatter
     public function parseNumber($value)
     {
         // Controllo sull'effettiva natura del numero
-        if (is_numeric($value)) {
+        $sign = null;
+        if ($value[0] == '+' || $value[0] == '-') {
+            $sign = $value[0];
+            $value = substr($value, 1);
+        }
+
+        $number = str_replace(array_values($this->getNumberSeparators()), '', $value);
+
+        $pieces = explode($this->getNumberSeparators()['decimals'], $value);
+        $integer = str_replace(array_values($this->getNumberSeparators()), '', $pieces[0]);
+
+        if (!ctype_digit($number) || (strlen($integer) != strlen((int) $integer))) {
             return false;
         }
 
+        $value = $sign.$value;
+
         if (is_object($this->numberFormatter)) {
             $result = $this->numberFormatter->parse($value);
         } else {