diff --git a/src/I18n/composer.json b/src/I18n/composer.json
index 846964e2156..879de83cbe8 100644
--- a/src/I18n/composer.json
+++ b/src/I18n/composer.json
@@ -16,6 +16,7 @@
     },
     "require": {
         "cakephp/core": "~3.0",
+        "lib-ICU": ">=4.8",
         "ext-intl": "*",
         "cakephp/chronos": "*",
         "aura/intl": "1.1.*"