diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 76bf26d4..f5ef02cc 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,6 +5,7 @@ Changelog
 Not yet released
 ----------------
 
+* Minimum PHP version is PHP 5.5.9 (not PHP 5.5.0).
 * Fixed ping error: Failed to parse address "8.8.8.8"
 * Added correct ping error messaging.
 * Added Twilio and Telegram to the notification list.
diff --git a/README.rst b/README.rst
index c93e1ef0..c3a86aab 100755
--- a/README.rst
+++ b/README.rst
@@ -78,7 +78,7 @@ Requirements
 
 * Web server
 * MySQL database
-* PHP 5.3.7+
+* PHP 5.5.9+
 * PHP cURL package
 * PHP PDO mysql driver
 * PHP-XML
diff --git a/composer.json b/composer.json
index c57152c9..3f1a12ff 100755
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
 		"symfony/http-foundation": "~3.4",
 		"php-pushover/php-pushover": "dev-master",
 		"paragonie/random_compat": "^2.0",
-		"twig/twig": "~1.35.3"
+		"twig/twig": "~1.35"
 	},
 	"autoload": {
 		"files": [
diff --git a/docs/requirements.rst b/docs/requirements.rst
index 2dbb9ce0..279fba99 100644
--- a/docs/requirements.rst
+++ b/docs/requirements.rst
@@ -5,6 +5,6 @@ Requirements
 
 * Web server
 * MySQL database
-* PHP 5.3.7+
+* PHP 5.5.9+
 * PHP cURL package
 * PHP PDO mysql driver
\ No newline at end of file
diff --git a/src/psm/Module/Install/Controller/InstallController.php b/src/psm/Module/Install/Controller/InstallController.php
index 09b5c606..21d18973 100644
--- a/src/psm/Module/Install/Controller/InstallController.php
+++ b/src/psm/Module/Install/Controller/InstallController.php
@@ -69,12 +69,15 @@ class InstallController extends AbstractController {
 		$errors = 0;
 
 		$phpv = phpversion();
-		if (version_compare($phpv, '5.3.7', '<')) {
+		if (version_compare($phpv, '5.5.9', '<')) {
 			$errors++;
-			$this->addMessage('PHP 5.3.7+ is required to run PHP Server Monitor.', 'error');
+			$this->addMessage('PHP 5.5.9+ is required to run PHP Server Monitor. You\'re using '.$phpv.'.', 'error');
 		} else {
 			$this->addMessage('PHP version: '.$phpv, 'success');
 		}
+		if (version_compare(PHP_RELEASE_VERSION, '7', '<')) {
+			$this->addMessage('PHP 5 reaches the end of life (January 1, 2019), please update to PHP 7. PHP supported versions can be found <a href="https://secure.php.net/supported-versions.php">here</a>.', 'warning');
+		}
 		if (!function_exists('curl_init')) {
 			$this->addMessage('PHP is installed without the cURL module. Please install cURL.', 'warning');
 		} else {