diff --git a/setup/setuputils.class.inc.php b/setup/setuputils.class.inc.php
index 5da882de7..307d4b8b4 100644
--- a/setup/setuputils.class.inc.php
+++ b/setup/setuputils.class.inc.php
@@ -49,15 +49,15 @@ class CheckResult
 class SetupUtils
 {
 	// -- Minimum versions (requirements : forbids installation if not met)
-	const PHP_MIN_VERSION = '5.3.6';
-	const MYSQL_MIN_VERSION = '5.0.0';
+	const PHP_MIN_VERSION = '5.6.0';
+	const MYSQL_MIN_VERSION = '5.5.3';
 	// -- versions that will be the minimum in next iTop major release (warning if not met)
 	const PHP_NEXT_MIN_VERSION = '5.6.0'; // 5.6 will be supported since the end of 2018 (see http://php.net/supported-versions.php)
 	const MYSQL_NEXT_MIN_VERSION = '5.5.3'; // 5.5 branch that is shipped with most distribution, and 5.5.3 to have utf8mb4 (see N°942)
 	// -- First recent version that is not yet validated by Combodo (warning)
 	const PHP_NOT_VALIDATED_VERSION = '7.2.0';
 
-	const MIN_MEMORY_LIMIT = 33554432; // = 32*1024*1024 Beware: Computations are not allowed in defining constants
+	const MIN_MEMORY_LIMIT = 32 * 1024 * 1024;
 	const SUHOSIN_GET_MAX_VALUE_LENGTH = 2048;
 
 	/**