diff --git a/.travis.yml b/.travis.yml
index 3f9e63ab7..ad14bf631 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,6 +22,7 @@ php:
 matrix:
   include:
     - php: 5.3
+      dist: precise
       env: 'COMPOSER_PHPUNIT="lowest"'
 
 before_script:
diff --git a/config/credit_cards.php b/config/credit_cards.php
index b32424a23..965260a38 100644
--- a/config/credit_cards.php
+++ b/config/credit_cards.php
@@ -47,7 +47,7 @@
 
 	'mastercard' => array(
 		'length' => '16',
-		'prefix' => '5[1-5]',
+		'prefix' => '5[1-5]|2[2-7]',
 		'luhn'   => TRUE,
 	),