diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index eede970..2031483 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -187,7 +187,7 @@ function system_requirements($phase) {
   }
 
   // @todo Remove once update support is dropped.
-  if (drupal_valid_test_ua()) {
+  if (drupal_valid_test_ua() || getenv('DRUPAL_DEV_SITE_PATH')) {
     if (version_compare($phpversion, DRUPAL_MINIMUM_UPDATE_PHP) < 0) {
       $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', ['%version' => DRUPAL_MINIMUM_UPDATE_PHP]);
       $requirements['php']['severity'] = REQUIREMENT_ERROR;