diff --git a/upgrades/6.0/scripts/BeforeUpgrade.php b/upgrades/6.0/scripts/BeforeUpgrade.php
index f1abd6051f..d82159ee16 100644
--- a/upgrades/6.0/scripts/BeforeUpgrade.php
+++ b/upgrades/6.0/scripts/BeforeUpgrade.php
@@ -86,9 +86,9 @@ class BeforeUpgrade
         if ($extension) {
             $version = $extension->get('version');
 
-            if (version_compare($version, '1.5.0', '<')) {
+            if (version_compare($version, '1.4.0', '<')) {
                 $message =
-                    "EspoCRM 6.0.0 is not compatible with Real Estate extension of a version lower than 1.5.0. " .
+                    "EspoCRM 6.0.0 is not compatible with Real Estate extension of a version lower than 1.4.0. " .
                     "Please upgrade the extension or uninstall it. Then run the upgrade command again.";
 
                 throw new Error($message);