diff --git a/composer.lock b/composer.lock
index 216890bb1d34df64c1fcc0c2a170ce1a9ec27486..73e72137f2fa50049c337fd15739319ae8d59977 100644
--- a/composer.lock
+++ b/composer.lock
@@ -437,7 +437,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "10.0.x-dev",
+            "version": "10.0.0-alpha5",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -680,7 +680,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "10.0.x-dev",
+            "version": "10.0.0-alpha5",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -713,7 +713,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "10.0.x-dev",
+            "version": "10.0.0-alpha5",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -8450,11 +8450,7 @@
     ],
     "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 7140a425fe33f3a845e12f910129c92582fadf53..5747163101357040c9cf183cfd14fb7c6af6e358 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "10.0.x-dev",
+        "drupal/core": "10.0.0-alpha5",
         "asm89/stack-cors": "v2.1.1",
         "composer/semver": "3.3.2",
         "doctrine/annotations": "1.13.2",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index 7d59a9a0c389a2da955c48c723dd54acba791efb..7abdac3bdcb8d8b50c82eccc487eb381d115cb71 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": "10.0.x-dev",
+        "drupal/core": "10.0.0-alpha5",
         "behat/mink": "v1.10.0",
         "behat/mink-browserkit-driver": "v2.1.0",
         "behat/mink-selenium2-driver": "v1.6.0",
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 230fd76a3c38ab9269c3282fa5ea1bd3be178cc0..0b1e4fa0a93d17fd206893586c8cf7a06003eeb1 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -75,7 +75,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '10.0.0-dev';
+  const VERSION = '10.0.0-alpha5';
 
   /**
    * Core API compatibility.