diff --git a/composer.lock b/composer.lock
index 5ecc2c54c49b576a6b21c5f4fa0870ae9b7f47d7..90da4f19583912580614c3292e574c551eeff1c6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -663,7 +663,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "8.9.x-dev",
+            "version": "8.9.15",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -897,7 +897,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "8.9.x-dev",
+            "version": "8.9.15",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -930,7 +930,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "8.9.x-dev",
+            "version": "8.9.15",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -6991,11 +6991,7 @@
     ],
     "aliases": [],
     "minimum-stability": "dev",
-    "stability-flags": {
-        "drupal/core": 20,
-        "drupal/core-project-message": 20,
-        "drupal/core-vendor-hardening": 20
-    },
+    "stability-flags": [],
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": [],
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index 11e1cec394b41fa220e183e24e5d3875bece6015..6d79a77c46ce35cce71efc15ce8f4ebae833f179 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "8.9.x-dev",
+        "drupal/core": "8.9.15",
         "asm89/stack-cors": "1.3.0",
         "composer/semver": "1.5.1",
         "doctrine/annotations": "v1.4.0",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index ebd482143488cce73e6e326c8b54064191a6afbe..9a23d4c3c02df6f63b7e777b762cc3ad1b989173 100644
--- a/composer/Metapackage/PinnedDevDependencies/composer.json
+++ b/composer/Metapackage/PinnedDevDependencies/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-require-dev": "*"
     },
     "require": {
-        "drupal/core": "8.9.x-dev",
+        "drupal/core": "8.9.15",
         "behat/mink": "v1.8.1",
         "behat/mink-browserkit-driver": "v1.3.4",
         "behat/mink-goutte-driver": "v1.2.1",
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 4bcdf197c7c9d480063f05bdd6407ac429b4ae65..fcc45827f5644fdea9e49634562d1644143ad3c9 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -82,7 +82,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '8.9.15-dev';
+  const VERSION = '8.9.15';
 
   /**
    * Core API compatibility.