diff --git a/composer.lock b/composer.lock
index 12d92551abdf488b55a0dfa08cbf0d18e7591b04..399d61224be871e16ae3617fe3de92acf5a2b7b5 100644
--- a/composer.lock
+++ b/composer.lock
@@ -491,7 +491,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "10.2.x-dev",
+            "version": "10.2.0-alpha1",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -649,7 +649,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "10.2.x-dev",
+            "version": "10.2.0-alpha1",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -682,7 +682,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "10.2.x-dev",
+            "version": "10.2.0-alpha1",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -9598,11 +9598,7 @@
     ],
     "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 fdc5776da360256905c4ee3d3f9002d4b4405885..ec7730b3765c6f80a3dd35d903940363e64bbd36 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "10.2.x-dev",
+        "drupal/core": "10.2.0-alpha1",
         "asm89/stack-cors": "~v2.1.1",
         "composer/semver": "~3.4.0",
         "doctrine/annotations": "~1.14.3",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index 350c82bb20c9b186d574feba08580931f48cb714..3b0b8a29228525c1f08aa8c882f719723f38adf8 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": "10.2.x-dev",
+        "drupal/core": "10.2.0-alpha1",
         "behat/mink": "v1.10.0",
         "behat/mink-browserkit-driver": "v2.1.0",
         "behat/mink-selenium2-driver": "v1.6.0",
diff --git a/composer/Template/LegacyProject/composer.json b/composer/Template/LegacyProject/composer.json
index a8fceccd0dd25590ff8cd74889af97fb1b6d142b..8e6a7e8633601aaef9b7a0679443806e6c7a4257 100644
--- a/composer/Template/LegacyProject/composer.json
+++ b/composer/Template/LegacyProject/composer.json
@@ -27,7 +27,7 @@
     "conflict": {
         "drupal/drupal": "*"
     },
-    "minimum-stability": "dev",
+    "minimum-stability": "alpha",
     "prefer-stable": true,
     "config": {
         "allow-plugins": {
diff --git a/composer/Template/RecommendedProject/composer.json b/composer/Template/RecommendedProject/composer.json
index 56d98de870fd8497c08158fe5339ac3cb470288b..0e5aa8cc3a9bc981f39fd4f8d0cddf7129a968bc 100644
--- a/composer/Template/RecommendedProject/composer.json
+++ b/composer/Template/RecommendedProject/composer.json
@@ -26,7 +26,7 @@
     "conflict": {
         "drupal/drupal": "*"
     },
-    "minimum-stability": "dev",
+    "minimum-stability": "alpha",
     "prefer-stable": true,
     "config": {
         "allow-plugins": {
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 9352af5d04343739fb5724ff477c703733f4bd60..47635ae0780b45a646b806bd4529bf8bdfdf8f52 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -75,7 +75,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '10.2.0-dev';
+  const VERSION = '10.2.0-alpha1';
 
   /**
    * Core API compatibility.
diff --git a/core/lib/Drupal/Component/Annotation/composer.json b/core/lib/Drupal/Component/Annotation/composer.json
index a755e8f048675147af091601089c74e521f38ecf..2fc7c8bec4cc2be8ea5cd1b937d0ae1f17f2f655 100644
--- a/core/lib/Drupal/Component/Annotation/composer.json
+++ b/core/lib/Drupal/Component/Annotation/composer.json
@@ -9,9 +9,9 @@
     "require": {
         "php": ">=8.1.0",
         "doctrine/annotations": "^1.14",
-        "drupal/core-file-cache": "10.2.x-dev",
-        "drupal/core-plugin": "10.2.x-dev",
-        "drupal/core-utility": "10.2.x-dev"
+        "drupal/core-file-cache": "10.2.0-alpha1",
+        "drupal/core-plugin": "10.2.0-alpha1",
+        "drupal/core-utility": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -23,5 +23,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/Datetime/composer.json b/core/lib/Drupal/Component/Datetime/composer.json
index 7a16ab9e344f7f0cc2dc7141653a47b87f66e325..1597171ffac25209c8290fa14492ac6a19f0e605 100644
--- a/core/lib/Drupal/Component/Datetime/composer.json
+++ b/core/lib/Drupal/Component/Datetime/composer.json
@@ -8,7 +8,7 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-utility": "10.2.x-dev"
+        "drupal/core-utility": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -20,5 +20,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/Discovery/composer.json b/core/lib/Drupal/Component/Discovery/composer.json
index c0800a842b7c169009507706838701ccc59f9985..df0d6b3738229138fe05cb8312682adbc90b4487 100644
--- a/core/lib/Drupal/Component/Discovery/composer.json
+++ b/core/lib/Drupal/Component/Discovery/composer.json
@@ -8,8 +8,8 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-file-cache": "10.2.x-dev",
-        "drupal/core-serialization": "10.2.x-dev"
+        "drupal/core-file-cache": "10.2.0-alpha1",
+        "drupal/core-serialization": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -21,5 +21,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/FrontMatter/composer.json b/core/lib/Drupal/Component/FrontMatter/composer.json
index ac246ae49b1570ae70cf22a6eb881260fae04bea..5ac3f25a8089f4c5693ad481e374ed2c9f6951e2 100644
--- a/core/lib/Drupal/Component/FrontMatter/composer.json
+++ b/core/lib/Drupal/Component/FrontMatter/composer.json
@@ -8,7 +8,7 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-serialization": "10.2.x-dev"
+        "drupal/core-serialization": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -20,5 +20,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/Gettext/composer.json b/core/lib/Drupal/Component/Gettext/composer.json
index 8893295f5fb00a6a3d60cb2c975e9c188020aa4b..038d81a8e85e92b53d00b65e4aa5797766f34a5e 100644
--- a/core/lib/Drupal/Component/Gettext/composer.json
+++ b/core/lib/Drupal/Component/Gettext/composer.json
@@ -9,7 +9,7 @@
     },
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-render": "10.2.x-dev"
+        "drupal/core-render": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -21,5 +21,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/PhpStorage/composer.json b/core/lib/Drupal/Component/PhpStorage/composer.json
index 29466cafd95ca577eaa8f4abd069b221e047d930..1e5d8cf4cb72383eaaaec87c69eae3ea84cbd961 100644
--- a/core/lib/Drupal/Component/PhpStorage/composer.json
+++ b/core/lib/Drupal/Component/PhpStorage/composer.json
@@ -8,7 +8,7 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-file-security": "10.2.x-dev"
+        "drupal/core-file-security": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -20,5 +20,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }
diff --git a/core/lib/Drupal/Component/Render/composer.json b/core/lib/Drupal/Component/Render/composer.json
index fd01afa0b255d2ece199d543df4b0ddbacdda904..7849ae9e4d1eaa71bc900bcd01f054775a5a1c42 100644
--- a/core/lib/Drupal/Component/Render/composer.json
+++ b/core/lib/Drupal/Component/Render/composer.json
@@ -8,7 +8,7 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "php": ">=8.1.0",
-        "drupal/core-utility": "10.2.x-dev"
+        "drupal/core-utility": "10.2.0-alpha1"
     },
     "autoload": {
         "psr-4": {
@@ -20,5 +20,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "alpha"
 }