diff --git a/composer.json b/composer.json
index a6251b07877d14de8c8f4730f4286b73c06a0a9c..c2fdd0e9e5675c75db232fe927378401f5c56a41 100644
--- a/composer.json
+++ b/composer.json
@@ -27,8 +27,8 @@
         "phpunit/phpunit": "^8.5.14 || ^9",
         "phpspec/prophecy": "^1.12",
         "symfony/css-selector": "^4.4",
-        "symfony/phpunit-bridge": "^5.3.0-rc1",
-        "symfony/var-dumper": "^5.3.0-rc1",
+        "symfony/phpunit-bridge": "^5.3.0",
+        "symfony/var-dumper": "^5.3.0",
         "symfony/error-handler": "^4.4",
         "justinrainbow/json-schema": "^5.2",
         "symfony/filesystem": "^4.4",
diff --git a/composer.lock b/composer.lock
index a0557a0147e229f4f9d8612d4436d8ed4ec4523d..fbc49d0da72813ac9f42baf391ef295574921a39 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "9caab8f13f1024c45a4184d7c351370c",
+    "content-hash": "aa10a6259c46de99ced09082eea4368a",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -534,7 +534,7 @@
             "dist": {
                 "type": "path",
                 "url": "core",
-                "reference": "454ec5a15af2123c790974d1ad622bbb8ed61ec5"
+                "reference": "538af067d3843f8b7394e98991fcec7c2d45213d"
             },
             "require": {
                 "asm89/stack-cors": "^1.1",
@@ -569,7 +569,7 @@
                 "symfony/event-dispatcher": "^4.4",
                 "symfony/http-foundation": "^4.4.7",
                 "symfony/http-kernel": "^4.4",
-                "symfony/mime": "^5.3.0-rc1",
+                "symfony/mime": "^5.3.0",
                 "symfony/polyfill-iconv": "^1.0",
                 "symfony/process": "^4.4",
                 "symfony/psr-http-message-bridge": "^2.0",
@@ -2996,16 +2996,16 @@
         },
         {
             "name": "symfony/mime",
-            "version": "v5.3.0-RC1",
+            "version": "v5.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/mime.git",
-                "reference": "0c3daded809edda4adee7179122a2a98069d8df7"
+                "reference": "ed710d297b181f6a7194d8172c9c2423d58e4852"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/mime/zipball/0c3daded809edda4adee7179122a2a98069d8df7",
-                "reference": "0c3daded809edda4adee7179122a2a98069d8df7",
+                "url": "https://api.github.com/repos/symfony/mime/zipball/ed710d297b181f6a7194d8172c9c2423d58e4852",
+                "reference": "ed710d297b181f6a7194d8172c9c2423d58e4852",
                 "shasum": ""
             },
             "require": {
@@ -3059,7 +3059,7 @@
                 "mime-type"
             ],
             "support": {
-                "source": "https://github.com/symfony/mime/tree/v5.3.0-RC1"
+                "source": "https://github.com/symfony/mime/tree/v5.3.0"
             },
             "funding": [
                 {
@@ -3075,7 +3075,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-16T13:08:56+00:00"
+            "time": "2021-05-26T17:43:10+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -4252,16 +4252,16 @@
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v5.3.0-RC1",
+            "version": "v5.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "29988c9bcac7bb66a03f00a2adaae131778db61c"
+                "reference": "1d3953e627fe4b5f6df503f356b6545ada6351f3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/29988c9bcac7bb66a03f00a2adaae131778db61c",
-                "reference": "29988c9bcac7bb66a03f00a2adaae131778db61c",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/1d3953e627fe4b5f6df503f356b6545ada6351f3",
+                "reference": "1d3953e627fe4b5f6df503f356b6545ada6351f3",
                 "shasum": ""
             },
             "require": {
@@ -4320,7 +4320,7 @@
                 "dump"
             ],
             "support": {
-                "source": "https://github.com/symfony/var-dumper/tree/v5.3.0-RC1"
+                "source": "https://github.com/symfony/var-dumper/tree/v5.3.0"
             },
             "funding": [
                 {
@@ -4336,7 +4336,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-07T14:34:05+00:00"
+            "time": "2021-05-27T12:28:50+00:00"
         },
         {
             "name": "symfony/yaml",
@@ -7810,16 +7810,16 @@
         },
         {
             "name": "symfony/phpunit-bridge",
-            "version": "v5.3.0-RC1",
+            "version": "v5.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/phpunit-bridge.git",
-                "reference": "f2ecbe9ce01a91dac62356560f1cc903ab689de0"
+                "reference": "15cab721487b7bf43ad545a1e7d0095782e26f8c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/f2ecbe9ce01a91dac62356560f1cc903ab689de0",
-                "reference": "f2ecbe9ce01a91dac62356560f1cc903ab689de0",
+                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/15cab721487b7bf43ad545a1e7d0095782e26f8c",
+                "reference": "15cab721487b7bf43ad545a1e7d0095782e26f8c",
                 "shasum": ""
             },
             "require": {
@@ -7873,7 +7873,7 @@
             "description": "Provides utilities for PHPUnit, especially user deprecation notices management",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/phpunit-bridge/tree/v5.3.0-RC1"
+                "source": "https://github.com/symfony/phpunit-bridge/tree/v5.3.0"
             },
             "funding": [
                 {
@@ -7889,7 +7889,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-16T13:08:56+00:00"
+            "time": "2021-05-26T17:57:12+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index e5dbaa32070871eccaef4b941809506caea3c935..9700ba588ad00c11f5c965b3c12432a7abb8bcce 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -45,7 +45,7 @@
         "symfony/http-client-contracts": "v2.4.0",
         "symfony/http-foundation": "v4.4.23",
         "symfony/http-kernel": "v4.4.24",
-        "symfony/mime": "v5.3.0-RC1",
+        "symfony/mime": "v5.3.0",
         "symfony/polyfill-ctype": "v1.22.1",
         "symfony/polyfill-iconv": "v1.22.1",
         "symfony/polyfill-intl-idn": "v1.22.1",
@@ -60,7 +60,7 @@
         "symfony/translation": "v4.4.24",
         "symfony/translation-contracts": "v2.4.0",
         "symfony/validator": "v4.4.24",
-        "symfony/var-dumper": "v5.3.0-RC1",
+        "symfony/var-dumper": "v5.3.0",
         "symfony/yaml": "v4.4.24",
         "twig/twig": "v2.14.6",
         "typo3/phar-stream-wrapper": "v3.1.6"
diff --git a/composer/Metapackage/DevDependencies/composer.json b/composer/Metapackage/DevDependencies/composer.json
index 9eb0f0edeb34a63b24cd7c77328274bff38ba4e7..d0955f8ec813553cdb33facfdf69321a41773ab7 100644
--- a/composer/Metapackage/DevDependencies/composer.json
+++ b/composer/Metapackage/DevDependencies/composer.json
@@ -27,7 +27,7 @@
         "symfony/filesystem": "^4.4",
         "symfony/finder": "^4.4",
         "symfony/lock": "^4.4",
-        "symfony/phpunit-bridge": "^5.3.0-rc1",
-        "symfony/var-dumper": "^5.3.0-rc1"
+        "symfony/phpunit-bridge": "^5.3.0",
+        "symfony/var-dumper": "^5.3.0"
     }
 }
diff --git a/composer/Metapackage/PinnedDevDependencies/composer.json b/composer/Metapackage/PinnedDevDependencies/composer.json
index f99fbae1b3087af2f6c963b914a15a1d8cf41d35..d719e415e4263e1c1c1024cc5e445cd19766e271 100644
--- a/composer/Metapackage/PinnedDevDependencies/composer.json
+++ b/composer/Metapackage/PinnedDevDependencies/composer.json
@@ -60,7 +60,7 @@
         "symfony/filesystem": "v4.4.22",
         "symfony/finder": "v4.4.24",
         "symfony/lock": "v4.4.23",
-        "symfony/phpunit-bridge": "v5.3.0-RC1",
+        "symfony/phpunit-bridge": "v5.3.0",
         "theseer/tokenizer": "1.2.0",
         "webmozart/assert": "1.10.0"
     }
diff --git a/core/composer.json b/core/composer.json
index b0677e756a2db565a44ff27ad5be716549e67021..742260782018f05295fabff23a1faa90e72da6bd 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -23,7 +23,7 @@
         "symfony/event-dispatcher": "^4.4",
         "symfony/http-foundation": "^4.4.7",
         "symfony/http-kernel": "^4.4",
-        "symfony/mime": "^5.3.0-rc1",
+        "symfony/mime": "^5.3.0",
         "symfony/routing": "^4.4",
         "symfony/serializer": "^4.4",
         "symfony/translation": "^4.4",
diff --git a/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php b/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
index 468069f8d8082edd8a6d502a9cc81a368d108339..8e87252b938371415ef985ba3b04fae199fdc570 100644
--- a/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
+++ b/core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php
@@ -32,7 +32,7 @@ class ComposerProjectTemplatesTest extends BuildTestBase {
    *
    * @see https://getcomposer.org/doc/04-schema.md#minimum-stability
    */
-  protected const MINIMUM_STABILITY = 'RC';
+  protected const MINIMUM_STABILITY = 'stable';
 
   /**
    * The order of stability strings from least stable to most stable.