diff --git a/README.rst b/README.rst
index e7472654..7204806a 100644
--- a/README.rst
+++ b/README.rst
@@ -77,7 +77,7 @@ Requirements
 
 * Web server
 * MySQL database
-* For PHP5: 5.5.9+
+* For PHP5: 5.6.0+
 * For PHP7: 7.0.8+
 * PHP cURL package
 * PHP PDO mysql driver
diff --git a/docs/requirements.rst b/docs/requirements.rst
index 636dde40..0a0f9838 100644
--- a/docs/requirements.rst
+++ b/docs/requirements.rst
@@ -5,7 +5,7 @@ Requirements
 
 * Web server
 * MySQL database
-* For PHP5: 5.5.9+
+* For PHP5: 5.6.0+
 * For PHP7: 7.0.8+
 * PHP cURL package
 * PHP PDO mysql driver
diff --git a/src/psm/Module/Install/Controller/InstallController.php b/src/psm/Module/Install/Controller/InstallController.php
index 4dc7aa1d..cd1e38e0 100644
--- a/src/psm/Module/Install/Controller/InstallController.php
+++ b/src/psm/Module/Install/Controller/InstallController.php
@@ -75,11 +75,11 @@ class InstallController extends AbstractController
 
         $phpv = phpversion();
         if (
-            version_compare($phpv, '5.5.9', '<') ||
+            version_compare($phpv, '5.6.0', '<') ||
             (version_compare($phpv, '7.0.8', '<') && version_compare($phpv, '7.0.0', '>='))
         ) {
             $errors++;
-            $this->addMessage('PHP 5.5.9+ or 7.0.8+ is required to run PHP Server Monitor. You\'re using ' .
+            $this->addMessage('PHP 5.6.0+ or 7.0.8+ is required to run PHP Server Monitor. You\'re using ' .
                 $phpv . '.', 'error');
         } else {
             $this->addMessage('PHP version: ' . $phpv, 'success');