diff --git a/core/INSTALL.txt b/core/INSTALL.txt
index 6ae05b4..2c135fb 100644
--- a/core/INSTALL.txt
+++ b/core/INSTALL.txt
@@ -18,7 +18,7 @@ Drupal requires:
 - A web server with PHP support, for example:
   - Apache 2.0 (or greater) (http://httpd.apache.org/).
   - Nginx 1.1 (or greater) (http://nginx.com/).
-- PHP 5.4.5 (or greater) (http://php.net/). For better security support it is
+- PHP 5.5.0 (or greater) (http://php.net/). For better security support it is
   recommended to update to at least 5.5.21 or 5.6.5.
 - One of the following databases:
   - MySQL 5.5.3 (or greater) (http://www.mysql.com/).
diff --git a/core/composer.json b/core/composer.json
index 87e3926..4d129d2 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -4,7 +4,7 @@
   "type": "drupal-core",
   "license": "GPL-2.0+",
   "require": {
-    "php": ">=5.4.5",
+    "php": ">=5.5.0",
     "sdboyer/gliph": "0.1.*",
     "symfony/class-loader": "2.7.*",
     "symfony/console": "2.7.*",
diff --git a/core/composer.lock b/core/composer.lock
index 5363898..49eb17a 100644
--- a/core/composer.lock
+++ b/core/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"
     ],
-    "hash": "61a2b6dec8252d78e904d37fbf1637d7",
+    "hash": "5f1fe21cad82da54bab97374aed8842e",
     "packages": [
         {
             "name": "behat/mink",
@@ -3295,7 +3295,7 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.4.5"
+        "php": ">=5.5.0"
     },
     "platform-dev": []
 }
diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index d11e608..61b7e47 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -23,7 +23,7 @@
 /**
  * Minimum supported version of PHP.
  */
-const DRUPAL_MINIMUM_PHP = '5.4.5';
+const DRUPAL_MINIMUM_PHP = '5.5.0';
 
 /**
  * Minimum recommended value of PHP memory_limit.
diff --git a/core/install.php b/core/install.php
index d884446..6871899 100644
--- a/core/install.php
+++ b/core/install.php
@@ -21,8 +21,8 @@
 // The minimum version is specified explicitly, as DRUPAL_MINIMUM_PHP is not
 // yet available. It is defined in bootstrap.inc, but it is not possible to
 // load that file yet as it would cause a fatal error on older versions of PHP.
-if (version_compare(PHP_VERSION, '5.4.5') < 0) {
-  print 'Your PHP installation is too old. Drupal requires at least PHP 5.4.5. See the <a href="https://www.drupal.org/requirements">system requirements</a> page for more information.';
+if (version_compare(PHP_VERSION, '5.5.0') < 0) {
+  print 'Your PHP installation is too old. Drupal requires at least PHP 5.5.0. See the <a href="https://www.drupal.org/requirements">system requirements</a> page for more information.';
   exit;
 }