diff --git a/composer.json b/composer.json
index 5419b7bc..43f0a68a 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "require": {
-        "php": ">=5.5",
+        "php": ">=5.6",
         "ext-dom": "*",
         "ext-json": "*",
         "ext-gd": "*",