diff --git a/composer.lock b/composer.lock
index 48fcb01a92918e3de6eac9a73b4e21300b8569eb..b75e457532cd6e923a62c0ab00c223100cb8de22 100644
--- a/composer.lock
+++ b/composer.lock
@@ -453,11 +453,11 @@
         },
         {
             "name": "drupal/core",
-            "version": "9.0.0-alpha2",
+            "version": "9.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "core",
-                "reference": "1135d82ca80e22e7f25b1bd9a8613cae5ae06372"
+                "reference": "f8e50d64acdddb816b10f83ca307712bd2cd65e5"
             },
             "require": {
                 "asm89/stack-cors": "^1.1",
@@ -699,7 +699,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "9.0.0-alpha2",
+            "version": "9.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -729,7 +729,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "9.0.0-alpha2",
+            "version": "9.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -6536,6 +6536,9 @@
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
+        "drupal/core": 20,
+        "drupal/core-project-message": 20,
+        "drupal/core-vendor-hardening": 20,
         "behat/mink": 20,
         "behat/mink-selenium2-driver": 20
     },
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index a498f8b8f74b4a7d74e5fecc1aba73962b27d5f2..82783170abf6d76ea66d390b91d909234f29706b 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "9.0.0-alpha2",
+        "drupal/core": "9.0.x-dev",
         "asm89/stack-cors": "1.3.0",
         "composer/installers": "v1.8.0",
         "composer/semver": "1.5.1",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index 416b0fc281e9c758237d93d010df9747c6796ac4..0cdef50e21b21bceffd5f75aa9e56226c3797724 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": "9.0.0-alpha2",
+        "drupal/core": "9.0.x-dev",
         "behat/mink": "1.8.0 | 1.7.1.1 | 1.7.x-dev",
         "behat/mink-browserkit-driver": "1.3.3",
         "behat/mink-goutte-driver": "v1.2.1",
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 176e47572252232c5177c4c20996a9b5c93eaacf..f6ba4727cf806954ef1f9bd369b0ff6fcf6f75e3 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -80,7 +80,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '9.0.0-alpha2';
+  const VERSION = '9.0.0-dev';
 
   /**
    * Core API compatibility.