diff --git a/composer.lock b/composer.lock
index 3ec38fe625f11342ff08ebd1b92461ff11219b62..19ef7193289fa1d97eaaf8e9f75ad1c4354743ea 100644
--- a/composer.lock
+++ b/composer.lock
@@ -531,7 +531,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "9.4.x-dev",
+            "version": "10.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -788,7 +788,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "9.4.x-dev",
+            "version": "10.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -821,7 +821,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "9.4.x-dev",
+            "version": "10.0.x-dev",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -7920,5 +7920,5 @@
     "platform-overrides": {
         "php": "7.3.0"
     },
-    "plugin-api-version": "2.1.0"
+    "plugin-api-version": "2.0.0"
 }
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index 538b0d879872ccb7bd6351670d5bb2a949ee4645..44fece3801c23c891c44d7eed594212db7a1c24f 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "9.4.x-dev",
+        "drupal/core": "10.0.x-dev",
         "asm89/stack-cors": "1.3.0",
         "composer/semver": "3.2.6",
         "doctrine/annotations": "1.13.2",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index c978945054d838f4f6f1f83137cf460bf1a065c6..36333d5d537171eaef47e3438603cdeac4765486 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": "9.4.x-dev",
+        "drupal/core": "10.0.x-dev",
         "behat/mink": "v1.9.0",
         "behat/mink-selenium2-driver": "v1.5.0",
         "composer/ca-bundle": "1.3.1",
diff --git a/composer/Template/LegacyProject/composer.json b/composer/Template/LegacyProject/composer.json
index 95e31ea7318a17be9888971f8e859b84bbef3f12..1eace67108a6ee0f20f8bfd528f5a8a3437eefd2 100644
--- a/composer/Template/LegacyProject/composer.json
+++ b/composer/Template/LegacyProject/composer.json
@@ -16,13 +16,13 @@
     ],
     "require": {
         "composer/installers": "^1.9",
-        "drupal/core-composer-scaffold": "^9.4",
-        "drupal/core-project-message": "^9.4",
-        "drupal/core-recommended": "^9.4",
-        "drupal/core-vendor-hardening": "^9.4"
+        "drupal/core-composer-scaffold": "^10.0",
+        "drupal/core-project-message": "^10.0",
+        "drupal/core-recommended": "^10.0",
+        "drupal/core-vendor-hardening": "^10.0"
     },
     "require-dev": {
-        "drupal/core-dev": "^9.4"
+        "drupal/core-dev": "^10.0"
     },
     "conflict": {
         "drupal/drupal": "*"
diff --git a/composer/Template/RecommendedProject/composer.json b/composer/Template/RecommendedProject/composer.json
index 789e1f5275605a31f75f50d57b881c6db9ab595d..16b2c11288a70c00886ec54a8e6a710a62fc7144 100644
--- a/composer/Template/RecommendedProject/composer.json
+++ b/composer/Template/RecommendedProject/composer.json
@@ -16,12 +16,12 @@
     ],
     "require": {
         "composer/installers": "^1.9",
-        "drupal/core-composer-scaffold": "^9.4",
-        "drupal/core-project-message": "^9.4",
-        "drupal/core-recommended": "^9.4"
+        "drupal/core-composer-scaffold": "^10.0",
+        "drupal/core-project-message": "^10.0",
+        "drupal/core-recommended": "^10.0"
     },
     "require-dev": {
-        "drupal/core-dev": "^9.4"
+        "drupal/core-dev": "^10.0"
     },
     "conflict": {
         "drupal/drupal": "*"
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 2a3e4d5e367e4d156940e2eb9bc75a3666ba195f..ca4295eb5df9530a9b9a5774575443005b68642c 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -75,7 +75,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '9.4.0-dev';
+  const VERSION = '10.0.0-dev';
 
   /**
    * Core API compatibility.