diff --git a/composer.json b/composer.json
index ad3456a..0662278 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "version": "1.0.2",
   "type": "library",
   "require": {
-    "php-di/php-di": "^5.4"
+    "php-di/php-di": "^6"
   },
   "autoload": {
     "psr-4": {