diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index cc1d7d05eaed7537216a441f68fde219a4fa64eb..4088176563f86fa6d842d8fa362f665b4823f8e5 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -131,7 +131,7 @@ class Drupal {
    * message, but Drupal can still be installed. Used for (e.g.) PHP versions
    * that have reached their EOL or will in the near future.
    */
-  const RECOMMENDED_PHP = '8.1';
+  const RECOMMENDED_PHP = '8.1.6';
 
   /**
    * The currently active container object, or NULL if not initialized yet.