diff --git a/composer.json b/composer.json
index 1bd9b0a..4cd0316 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,8 @@
   "prefer-stable": true,
   "require": {
     "php": ">=7.2",
-    "ext-mbstring": "*"
+    "ext-mbstring": "*",
+    "ext-intl": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^8.5"