diff --git a/index.php b/index.php
index cba52284b..f9e26204e 100644
--- a/index.php
+++ b/index.php
@@ -11,8 +11,8 @@
 
 	// we need a separate check here because functions.php might get parsed
 	// incorrectly before 5.3 because of :: syntax.
-	if (version_compare(PHP_VERSION, '5.3.0', '<')) {
-		print "<b>Fatal Error</b>: PHP version 5.3.0 or newer required.\n";
+	if (version_compare(PHP_VERSION, '5.6.0', '<')) {
+		print "<b>Fatal Error</b>: PHP version 5.6.0 or newer required.\n";
 		exit;
 	}
 
diff --git a/install/index.php b/install/index.php
index 350c2f2d0..e20cd48ca 100755
--- a/install/index.php
+++ b/install/index.php
@@ -38,8 +38,8 @@
 	function sanity_check($db_type) {
 		$errors = array();
 
-		if (version_compare(PHP_VERSION, '5.4.0', '<')) {
-			array_push($errors, "PHP version 5.4.0 or newer required.");
+		if (version_compare(PHP_VERSION, '5.6.0', '<')) {
+			array_push($errors, "PHP version 5.6.0 or newer required.");
 		}
 
 		if (!function_exists("curl_init") && !ini_get("allow_url_fopen")) {