diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 230fd76a3c38ab9269c3282fa5ea1bd3be178cc0..e34cbf7857b66bc311a0f8d5550259a5a76180c8 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.