diff --git a/composer.json b/composer.json
index 0098230..6326b35 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
   "license": "MIT",
   "require": {
     "php": ">=5.6.0",
+    "ext-intl": "*",
     "ext-gettext": "*",
     "ipl/stdlib": ">=0.6.0"
   },