diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 272b1e19abd999b51a314c67e70e98f9c83a4a3c..ccd2d848147ccf0a7366b1c3d47bb676389f87ed 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -121,7 +121,7 @@ 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.