diff --git a/composer.lock b/composer.lock
index 470c8c3b14a..79702d473e3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -492,7 +492,7 @@
         },
         {
             "name": "drupal/core",
-            "version": "11.1.x-dev",
+            "version": "11.1.0-rc1",
             "dist": {
                 "type": "path",
                 "url": "core",
@@ -657,7 +657,7 @@
         },
         {
             "name": "drupal/core-project-message",
-            "version": "11.1.x-dev",
+            "version": "11.1.0-rc1",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/ProjectMessage",
@@ -690,7 +690,7 @@
         },
         {
             "name": "drupal/core-vendor-hardening",
-            "version": "11.1.x-dev",
+            "version": "11.1.0-rc1",
             "dist": {
                 "type": "path",
                 "url": "composer/Plugin/VendorHardening",
@@ -9861,9 +9861,6 @@
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
-        "drupal/core": 20,
-        "drupal/core-project-message": 20,
-        "drupal/core-vendor-hardening": 20,
         "symfony/browser-kit": 10,
         "symfony/css-selector": 10,
         "symfony/dom-crawler": 10,
@@ -9873,8 +9870,8 @@
     },
     "prefer-stable": true,
     "prefer-lowest": false,
-    "platform": {},
-    "platform-dev": {},
+    "platform": [],
+    "platform-dev": [],
     "platform-overrides": {
         "php": "8.3.0"
     },
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index d1d59147600..4bebc4f56b2 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "11.1.x-dev",
+        "drupal/core": "11.1.0-rc1",
         "asm89/stack-cors": "~v2.2.0",
         "composer/semver": "~3.4.3",
         "doctrine/annotations": "~2.0.2",
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index ffd55edfdc0..8e7e9403d1c 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": "11.1.x-dev",
+        "drupal/core": "11.1.0-rc1",
         "behat/mink": "v1.12.0",
         "behat/mink-browserkit-driver": "v2.2.0",
         "brick/math": "0.12.1",
diff --git a/composer/Template/LegacyProject/composer.json b/composer/Template/LegacyProject/composer.json
index 85fd97faff9..fe8539dbf98 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": "RC",
     "prefer-stable": true,
     "config": {
         "allow-plugins": {
diff --git a/composer/Template/RecommendedProject/composer.json b/composer/Template/RecommendedProject/composer.json
index fea4ea9b574..2a2faec3332 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": "RC",
     "prefer-stable": true,
     "config": {
         "allow-plugins": {
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index a4fec9c9fdb..1d872618b03 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -75,7 +75,7 @@ class Drupal {
   /**
    * The current system version.
    */
-  const VERSION = '11.1.0-dev';
+  const VERSION = '11.1.0-rc1';
 
   /**
    * Core API compatibility.
diff --git a/core/lib/Drupal/Component/Annotation/composer.json b/core/lib/Drupal/Component/Annotation/composer.json
index 2426fffab78..df87bce8d9f 100644
--- a/core/lib/Drupal/Component/Annotation/composer.json
+++ b/core/lib/Drupal/Component/Annotation/composer.json
@@ -10,10 +10,10 @@
         "php": ">=8.3.0",
         "doctrine/annotations": "^2.0",
         "doctrine/lexer": "^2.0",
-        "drupal/core-class-finder": "11.1.x-dev",
-        "drupal/core-file-cache": "11.1.x-dev",
-        "drupal/core-plugin": "11.1.x-dev",
-        "drupal/core-utility": "11.1.x-dev"
+        "drupal/core-class-finder": "11.1.0-rc1",
+        "drupal/core-file-cache": "11.1.0-rc1",
+        "drupal/core-plugin": "11.1.0-rc1",
+        "drupal/core-utility": "11.1.0-rc1"
     },
     "autoload": {
         "psr-4": {
@@ -25,5 +25,5 @@
             "This file was partially generated automatically. See: https://www.drupal.org/node/3293830"
         ]
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "RC"
 }
diff --git a/core/lib/Drupal/Component/Datetime/composer.json b/core/lib/Drupal/Component/Datetime/composer.json
index c36f4b79ba6..e841d017d07 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": ">=8.3.0",
-        "drupal/core-utility": "11.1.x-dev"
+        "drupal/core-utility": "11.1.0-rc1"
     },
     "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": "RC"
 }
diff --git a/core/lib/Drupal/Component/Discovery/composer.json b/core/lib/Drupal/Component/Discovery/composer.json
index 4eb0ebcc910..fc5cc5b4eb2 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": ">=8.3.0",
-        "drupal/core-file-cache": "11.1.x-dev",
-        "drupal/core-serialization": "11.1.x-dev"
+        "drupal/core-file-cache": "11.1.0-rc1",
+        "drupal/core-serialization": "11.1.0-rc1"
     },
     "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": "RC"
 }
diff --git a/core/lib/Drupal/Component/FrontMatter/composer.json b/core/lib/Drupal/Component/FrontMatter/composer.json
index c438abbce87..26a1be384bc 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": ">=8.3.0",
-        "drupal/core-serialization": "11.1.x-dev"
+        "drupal/core-serialization": "11.1.0-rc1"
     },
     "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": "RC"
 }
diff --git a/core/lib/Drupal/Component/Gettext/composer.json b/core/lib/Drupal/Component/Gettext/composer.json
index 4f0fd921ced..8efb6ef63f2 100644
--- a/core/lib/Drupal/Component/Gettext/composer.json
+++ b/core/lib/Drupal/Component/Gettext/composer.json
@@ -9,7 +9,7 @@
     },
     "require": {
         "php": ">=8.3.0",
-        "drupal/core-render": "11.1.x-dev"
+        "drupal/core-render": "11.1.0-rc1"
     },
     "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": "RC"
 }
diff --git a/core/lib/Drupal/Component/PhpStorage/composer.json b/core/lib/Drupal/Component/PhpStorage/composer.json
index 12e76f45fe2..0ff4314a7a3 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": ">=8.3.0",
-        "drupal/core-file-security": "11.1.x-dev"
+        "drupal/core-file-security": "11.1.0-rc1"
     },
     "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": "RC"
 }
diff --git a/core/lib/Drupal/Component/Render/composer.json b/core/lib/Drupal/Component/Render/composer.json
index 974daf05607..17412991b47 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": ">=8.3.0",
-        "drupal/core-utility": "11.1.x-dev"
+        "drupal/core-utility": "11.1.0-rc1"
     },
     "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": "RC"
 }