diff --git a/composer.json b/composer.json
index 989279c..6e91013 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,8 @@
         }
     ],
     "require": {
-        "php": ">=5.3.3"
+        "php": ">=5.3.3",
+        "zendframework/zend-eventmanager": "2.*"
     },
     "require-dev": {
         "phpunit/phpunit":           ">=3.7",