diff --git a/composer.json b/composer.json
index 82223428..98cbea4f 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
     "license": "MIT",
 
     "require": {
-        "php": "<=5.5.99",
+        "php": "~5.5.0",
         "jakubledl/dissect": "~1.0",
         "doctrine/annotations": "~1.2.0",
         "andrewsville/php-token-reflection": "~1.4"