diff --git a/README.markdown b/README.markdown
index 0b08f7b9..c1482904 100644
--- a/README.markdown
+++ b/README.markdown
@@ -29,7 +29,7 @@ check out one of the versioned branches.
 # Requirements
 
 - MySQL/MariaDB 5.1+ (with experimental support for PostgreSQL 9+ and SQLite 3)
-- [Stable PHP](https://en.wikipedia.org/wiki/PHP#Release_history) (5.5 as of writing)
+- [Stable PHP](https://en.wikipedia.org/wiki/PHP#Release_history) (5.6+ as of writing)
 - GD or ImageMagick
 
 # Installation
diff --git a/composer.json b/composer.json
index 4101ec85..6f1cbc84 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 	],
 
 	"require" : {
-		"php" : ">=5.4.8",
+		"php" : ">=5.6",
 		"phpunit/phpunit" : "*",
 
 		"flexihash/flexihash"       : "^2.0.0",
diff --git a/composer.lock b/composer.lock
index a3ff5204..24d84951 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "fa557e1b07c78579308549767c7dcd51",
+    "content-hash": "5ce7a26b4b4af7a50993ac213aea963b",
     "packages": [
         {
             "name": "bower-asset/jquery",
@@ -1696,7 +1696,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.4.8"
+        "php": ">=5.6"
     },
     "platform-dev": []
 }