diff --git a/composer.json b/composer.json
index 6a77b0f..29b5986 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=5.3.3",
-        "checkdomain/holiday": "~1.1"
+        "checkdomain/holiday": "~2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "3.7.*"