diff --git a/composer.lock b/composer.lock
index a7d1218aefe30f2d683eac9683dee0ac0ecafbaf..7772a6c5d4e417bf1cf986b791c4804a8140991f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1935,7 +1935,7 @@
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@@ -3682,7 +3682,7 @@
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@@ -4046,16 +4046,16 @@
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@@ -4301,7 +4301,7 @@
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@@ -4353,7 +4353,7 @@
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@@ -9348,7 +9348,7 @@
             "description": "Provides utilities for PHPUnit, especially user deprecation notices management",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/phpunit-bridge/tree/v6.4.0-BETA3"
+                "source": "https://github.com/symfony/phpunit-bridge/tree/v6.4.0-RC1"
             },
             "funding": [
                 {
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index 3f95763ffd83a1fb9079a53223c880b85b12dab9..4213d8c65001da0d0c79e63d9106010d099dc481 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -31,18 +31,18 @@
         "psr/log": "~3.0.0",
         "ralouphie/getallheaders": "~3.0.3",
         "sebastian/diff": "~4.0.5",
-        "symfony/console": "~v6.4.0-BETA3",
-        "symfony/dependency-injection": "~v6.4.0-BETA3",
+        "symfony/console": "~v6.4.0-RC1",
+        "symfony/dependency-injection": "~v6.4.0-RC1",
         "symfony/deprecation-contracts": "~v3.3.0",
-        "symfony/error-handler": "~v6.4.0-BETA1",
-        "symfony/event-dispatcher": "~v6.4.0-BETA1",
+        "symfony/error-handler": "~v6.4.0-RC1",
+        "symfony/event-dispatcher": "~v6.4.0-RC1",
         "symfony/event-dispatcher-contracts": "~v3.3.0",
-        "symfony/filesystem": "~v6.4.0-BETA1",
-        "symfony/finder": "~v6.4.0-BETA3",
-        "symfony/http-foundation": "~v6.4.0-BETA3",
-        "symfony/http-kernel": "~v6.4.0-BETA3",
-        "symfony/mailer": "~v6.4.0-BETA3",
-        "symfony/mime": "~v6.4.0-BETA1",
+        "symfony/filesystem": "~v6.4.0-RC1",
+        "symfony/finder": "~v6.4.0-RC1",
+        "symfony/http-foundation": "~v6.4.0-RC1",
+        "symfony/http-kernel": "~v6.4.0-RC1",
+        "symfony/mailer": "~v6.4.0-RC1",
+        "symfony/mime": "~v6.4.0-RC1",
         "symfony/polyfill-ctype": "~v1.28.0",
         "symfony/polyfill-iconv": "~v1.28.0",
         "symfony/polyfill-intl-grapheme": "~v1.28.0",
@@ -50,17 +50,17 @@
         "symfony/polyfill-intl-normalizer": "~v1.28.0",
         "symfony/polyfill-mbstring": "~v1.28.0",
         "symfony/polyfill-php83": "~v1.28.0",
-        "symfony/process": "~v6.4.0-BETA3",
+        "symfony/process": "~v6.4.0-RC1",
         "symfony/psr-http-message-bridge": "~v2.3.1",
-        "symfony/routing": "~v6.4.0-BETA3",
-        "symfony/serializer": "~v6.4.0-BETA3",
+        "symfony/routing": "~v6.4.0-RC1",
+        "symfony/serializer": "~v6.4.0-RC1",
         "symfony/service-contracts": "~v3.3.0",
         "symfony/string": "~v6.3.8",
         "symfony/translation-contracts": "~v3.3.0",
-        "symfony/validator": "~v6.4.0-BETA3",
-        "symfony/var-dumper": "~v6.4.0-BETA3",
+        "symfony/validator": "~v6.4.0-RC1",
+        "symfony/var-dumper": "~v6.4.0-RC1",
         "symfony/var-exporter": "~v6.3.6",
-        "symfony/yaml": "~v6.4.0-BETA3",
+        "symfony/yaml": "~v6.4.0-RC1",
         "twig/twig": "~v3.7.1"
     }
 }
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index ef8e837d1aeb0a27a036fe4b0997e0f56a55d4b6..d91b60776f8d6cc6fa69dc65d61fc6470ebdc085 100644
--- a/composer/Metapackage/PinnedDevDependencies/composer.json
+++ b/composer/Metapackage/PinnedDevDependencies/composer.json
@@ -25,7 +25,7 @@
         "google/protobuf": "v3.25.0",
         "instaclick/php-webdriver": "1.4.16",
         "justinrainbow/json-schema": "v5.2.13",
-        "mglaman/phpstan-drupal": "1.2.2",
+        "mglaman/phpstan-drupal": "1.2.4",
         "micheh/phpcs-gitlab": "1.1.0",
         "mikey179/vfsstream": "v1.6.11",
         "myclabs/deep-copy": "1.11.1",
@@ -80,11 +80,11 @@
         "sirbrillig/phpcs-variable-analysis": "v2.11.17",
         "slevomat/coding-standard": "8.14.1",
         "squizlabs/php_codesniffer": "3.7.2",
-        "symfony/browser-kit": "v6.4.0-BETA3",
-        "symfony/css-selector": "v6.4.0-BETA3",
-        "symfony/dom-crawler": "v6.4.0-BETA2",
-        "symfony/lock": "v6.4.0-BETA3",
-        "symfony/phpunit-bridge": "v6.4.0-BETA3",
+        "symfony/browser-kit": "v6.4.0-RC1",
+        "symfony/css-selector": "v6.4.0-RC1",
+        "symfony/dom-crawler": "v6.4.0-RC1",
+        "symfony/lock": "v6.4.0-RC1",
+        "symfony/phpunit-bridge": "v6.4.0-RC1",
         "symfony/polyfill-php82": "v1.28.0",
         "theseer/tokenizer": "1.2.1",
         "webflo/drupal-finder": "1.2.2",
diff --git a/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php b/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
index f0458ae16956b12aeadb41f89bbe3af7524d268f..6104edf43960bef251208d3a2bf40c10609098db 100644
--- a/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
+++ b/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
@@ -30,7 +30,7 @@ class ComposerProjectTemplatesTest extends ComposerBuildTestBase {
    *
    * @see https://getcomposer.org/doc/04-schema.md#minimum-stability
    */
-  protected const MINIMUM_STABILITY = 'beta';
+  protected const MINIMUM_STABILITY = 'RC';
 
   /**
    * The order of stability strings from least stable to most stable.