diff --git a/composer.lock b/composer.lock
index 8502c2ea4ad..4b98a53b05a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -648,7 +648,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "8.9.0-rc1",
+            "version": "8.9.x-dev",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -879,7 +879,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "8.9.0-rc1",
+            "version": "8.9.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -909,7 +909,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "8.9.0-rc1",
+            "version": "8.9.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -4007,6 +4007,9 @@
                 "ext-zip": "Enabling the zip extension allows you to unzip archives",
                 "ext-zlib": "Allow gzip compression of HTTP requests"
             },
+            "bin": [
+                "bin/composer"
+            ],
             "type": "library",
             "extra": {
                 "branch-alias": {
@@ -6521,7 +6524,11 @@
     ],
     "aliases": [],
     "minimum-stability": "dev",
-    "stability-flags": [],
+    "stability-flags": {
+        "drupal/core": 20,
+        "drupal/core-project-message": 20,
+        "drupal/core-vendor-hardening": 20
+    },
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": [],
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index 0963453f283..bb61b7f7578 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "8.9.0-rc1",
+        "drupal/core": "8.9.x-dev",
         "asm89/stack-cors": "1.3.0",
         "composer/installers": "v1.7.0",
         "composer/semver": "1.5.1",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index 4e50dbade76..3dfbc754113 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": "8.9.0-rc1",
+        "drupal/core": "8.9.x-dev",
         "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 70aba3cbaf5..58c0c7f2f36 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -82,7 +82,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '8.9.0-rc1';
+  const VERSION = '8.9.0-dev';
 
   /**
    * Core API compatibility.