diff --git a/composer.json b/composer.json
index 431de1b..1f4ea2a 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     ],
     "require": {
         "php": ">=5.4.0",
-        "illuminate/support": "4.*|5.*",
+        "illuminate/support": "5.*",
         "openbuildings/postmark": "^0.3.2"
     },
     "autoload": {