diff --git a/composer.json b/composer.json
index 63b08d9a2d4..21479ab8088 100644
--- a/composer.json
+++ b/composer.json
@@ -23,16 +23,16 @@
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         "phpunit/phpunit": "^8.4.1",
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-        "symfony/css-selector": "^4.4",
+        "symfony/css-selector": "^4.4|^5.1",
         "symfony/phpunit-bridge": "^5.1.4",
         "symfony/var-dumper": "^5.1.2",
-        "symfony/error-handler": "^4.4",
+        "symfony/error-handler": "^4.4|^5.1",
         "justinrainbow/json-schema": "^5.2",
-        "symfony/filesystem": "^4.4",
-        "symfony/finder": "^4.4",
-        "symfony/lock": "^4.4",
-        "symfony/browser-kit": "^4.4",
-        "symfony/dom-crawler": "^4.4 !=4.4.5",
+        "symfony/filesystem": "^4.4|^5.1",
+        "symfony/finder": "^4.4|^5.1",
+        "symfony/lock": "^4.4|^5.1",
+        "symfony/browser-kit": "^4.4|^5.1",
+        "symfony/dom-crawler": "^4.4|^5.1 !=4.4.5",
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diff --git a/composer.lock b/composer.lock
index e75dc069854..796acb8f42a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "ef1bde282aaecd53793120c55ae76e46",
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@@ -183,16 +183,10 @@
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-                },
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-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
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+            "support": {
+                "issues": "https://github.com/composer/installers/issues",
+                "source": "https://github.com/composer/installers/tree/v1.9.0"
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             ],
-            "description": "Drupal is an open source content management platform powering millions of websites and applications.",
-            "transport-options": {
-                "relative": true
-            }
+            "description": "Drupal is an open source content management platform powering millions of websites and applications."
         },
         {
             "name": "drupal/core-project-message",
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+            "source": {
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+                "url": "https://github.com/drupal/core-project-message.git",
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-                "reference": "b4efdbe26634b41a1b89e4f3770a8074769088a6"
+                "type": "zip",
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+                "reference": "812d6da43dd49cc210af62e80fa92189e68e565a",
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@@ -755,18 +738,21 @@
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         {
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+                "url": "https://github.com/drupal/core-vendor-hardening.git",
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-                "reference": "d54f0b3cc8b4237f3a41a0860a808db242f9da9e"
+                "type": "zip",
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+                "reference": "71df53f24d54c464ac18762a530fc7c3bf131a7f",
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@@ -788,10 +774,7 @@
             "homepage": "https://www.drupal.org/project/drupal",
             "keywords": [
                 "drupal"
-            ],
-            "transport-options": {
-                "relative": true
-            }
+            ]
         },
         {
             "name": "egulias/email-validator",
@@ -1126,12 +1109,6 @@
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             "time": "2020-07-07T15:34:31+00:00"
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@@ -1248,12 +1225,6 @@
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-                    "type": "community_bridge"
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             "time": "2020-08-18T13:45:04+00:00"
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@@ -1304,12 +1275,6 @@
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@@ -1362,12 +1327,6 @@
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-                    "type": "community_bridge"
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             "time": "2020-08-18T16:34:51+00:00"
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@@ -2071,20 +2030,6 @@
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             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
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-                    "type": "custom"
-                },
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             "time": "2020-08-17T07:39:58+00:00"
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@@ -2142,20 +2087,6 @@
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             "description": "Symfony Debug Component",
             "homepage": "https://symfony.com",
-            "funding": [
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-                },
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             "time": "2020-08-10T07:47:39+00:00"
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@@ -2229,20 +2160,6 @@
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             "description": "Symfony DependencyInjection Component",
             "homepage": "https://symfony.com",
-            "funding": [
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-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
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             "time": "2020-08-17T09:56:45+00:00"
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@@ -2300,20 +2217,6 @@
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             "description": "Symfony ErrorHandler Component",
             "homepage": "https://symfony.com",
-            "funding": [
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@@ -2384,20 +2287,6 @@
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@@ -2460,20 +2349,6 @@
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             "time": "2020-07-06T13:19:58+00:00"
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@@ -2529,20 +2404,6 @@
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             "description": "Symfony HttpFoundation Component",
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-                    "type": "custom"
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             "time": "2020-08-17T07:39:58+00:00"
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@@ -2634,20 +2495,6 @@
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             "description": "Symfony HttpKernel Component",
             "homepage": "https://symfony.com",
-            "funding": [
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-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
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@@ -2711,20 +2558,6 @@
                 "mime",
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-            "funding": [
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-                    "type": "custom"
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@@ -2787,20 +2620,6 @@
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@@ -2864,20 +2683,6 @@
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@@ -2949,20 +2754,6 @@
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@@ -3030,20 +2821,6 @@
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@@ -3107,20 +2884,6 @@
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@@ -3187,20 +2950,6 @@
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@@ -3250,20 +2999,6 @@
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             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "funding": [
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@@ -3328,20 +3063,6 @@
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@@ -3418,20 +3139,6 @@
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@@ -3514,20 +3221,6 @@
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             "description": "Symfony Serializer Component",
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-            "funding": [
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@@ -3590,20 +3283,6 @@
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@@ -3680,20 +3359,6 @@
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             "description": "Symfony Translation Component",
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@@ -3755,20 +3420,6 @@
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@@ -3862,20 +3513,6 @@
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             "description": "Symfony Validator Component",
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@@ -3952,20 +3589,6 @@
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@@ -4025,20 +3648,6 @@
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@@ -4104,16 +3713,6 @@
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@@ -4456,20 +4055,6 @@
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-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-23T12:54:47+00:00"
         },
         {
@@ -4547,20 +4132,6 @@
                 "dependency",
                 "package"
             ],
-            "funding": [
-                {
-                    "url": "https://packagist.com",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/composer",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-03T09:35:19+00:00"
         },
         {
@@ -4621,20 +4192,6 @@
                 "spdx",
                 "validator"
             ],
-            "funding": [
-                {
-                    "url": "https://packagist.com",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/composer",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-07-15T15:35:07+00:00"
         },
         {
@@ -4679,20 +4236,6 @@
                 "Xdebug",
                 "performance"
             ],
-            "funding": [
-                {
-                    "url": "https://packagist.com",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/composer",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-19T10:27:58+00:00"
         },
         {
@@ -4749,20 +4292,6 @@
                 "constructor",
                 "instantiate"
             ],
-            "funding": [
-                {
-                    "url": "https://www.doctrine-project.org/sponsorship.html",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://www.patreon.com/phpdoctrine",
-                    "type": "patreon"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-05-29T17:27:14+00:00"
         },
         {
@@ -5137,12 +4666,6 @@
                 "object",
                 "object graph"
             ],
-            "funding": [
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-06-29T13:22:24+00:00"
         },
         {
@@ -5790,16 +5313,6 @@
                 "testing",
                 "xunit"
             ],
-            "funding": [
-                {
-                    "url": "https://phpunit.de/donate.html",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
             "time": "2020-06-22T07:06:58+00:00"
         },
         {
@@ -6464,16 +5977,6 @@
                 "parser",
                 "validator"
             ],
-            "funding": [
-                {
-                    "url": "https://github.com/Seldaek",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/seld/jsonlint",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-25T06:56:57+00:00"
         },
         {
@@ -6628,20 +6131,6 @@
             ],
             "description": "Symfony BrowserKit Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-05-22T17:28:00+00:00"
         },
         {
@@ -6695,20 +6184,6 @@
             ],
             "description": "Symfony CssSelector Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-07-05T09:39:30+00:00"
         },
         {
@@ -6770,20 +6245,6 @@
             ],
             "description": "Symfony DomCrawler Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-12T06:20:35+00:00"
         },
         {
@@ -6834,20 +6295,6 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-21T17:19:37+00:00"
         },
         {
@@ -6897,20 +6344,6 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-17T09:56:45+00:00"
         },
         {
@@ -6976,20 +6409,6 @@
                 "redlock",
                 "semaphore"
             ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-17T07:39:58+00:00"
         },
         {
@@ -7055,20 +6474,6 @@
             ],
             "description": "Symfony PHPUnit Bridge",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-08-28T16:19:35+00:00"
         },
         {
@@ -7109,12 +6514,6 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "funding": [
-                {
-                    "url": "https://github.com/theseer",
-                    "type": "github"
-                }
-            ],
             "time": "2020-07-12T23:59:07+00:00"
         },
         {
@@ -7177,6 +6576,5 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "platform-dev": []
 }
diff --git a/composer/Metapackage/CoreRecommended/composer.json b/composer/Metapackage/CoreRecommended/composer.json
index 39e3d9b6d0d..714094710f1 100644
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -13,6 +13,8 @@
         "doctrine/annotations": "1.10.4",
         "doctrine/lexer": "1.2.1",
         "doctrine/reflection": "1.2.1",
+        "drupal/core-project-message": "9.1.x-dev",
+        "drupal/core-vendor-hardening": "9.1.x-dev",
         "egulias/email-validator": "2.1.19",
         "guzzlehttp/guzzle": "6.5.5",
         "guzzlehttp/promises": "v1.3.1",
diff --git a/composer/Metapackage/DevDependencies/composer.json b/composer/Metapackage/DevDependencies/composer.json
index 3c107300090..c9c01af5ef5 100644
--- a/composer/Metapackage/DevDependencies/composer.json
+++ b/composer/Metapackage/DevDependencies/composer.json
@@ -17,13 +17,13 @@
         "mikey179/vfsstream": "^1.6.8",
         "phpspec/prophecy": "^1.7",
         "phpunit/phpunit": "^8.4.1",
-        "symfony/browser-kit": "^4.4",
-        "symfony/css-selector": "^4.4",
-        "symfony/dom-crawler": "^4.4 !=4.4.5",
-        "symfony/error-handler": "^4.4",
-        "symfony/filesystem": "^4.4",
-        "symfony/finder": "^4.4",
-        "symfony/lock": "^4.4",
+        "symfony/browser-kit": "^4.4|^5.1",
+        "symfony/css-selector": "^4.4|^5.1",
+        "symfony/dom-crawler": "^4.4|^5.1 !=4.4.5",
+        "symfony/error-handler": "^4.4|^5.1",
+        "symfony/filesystem": "^4.4|^5.1",
+        "symfony/finder": "^4.4|^5.1",
+        "symfony/lock": "^4.4|^5.1",
         "symfony/phpunit-bridge": "^5.1.4",
         "symfony/var-dumper": "^5.1.2"
     }
diff --git a/core/composer.json b/core/composer.json
index cf64c7800f2..ff9a9a60a37 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -18,18 +18,18 @@
         "ext-tokenizer": "*",
         "ext-xml": "*",
         "php": ">=7.3",
-        "symfony/console": "^4.4",
-        "symfony/dependency-injection": "^4.4",
-        "symfony/event-dispatcher": "^4.4",
-        "symfony/http-foundation": "^4.4.7",
-        "symfony/http-kernel": "^4.4",
-        "symfony/routing": "^4.4",
-        "symfony/serializer": "^4.4",
-        "symfony/translation": "^4.4",
-        "symfony/validator": "^4.4",
-        "symfony/process": "^4.4",
+        "symfony/console": "^4.4|^5.1",
+        "symfony/dependency-injection": "^4.4|^5.1",
+        "symfony/event-dispatcher": "^4.4|^5.1",
+        "symfony/http-foundation": "^4.4.7|^5.1",
+        "symfony/http-kernel": "^4.4|^5.1",
+        "symfony/routing": "^4.4|^5.1",
+        "symfony/serializer": "^4.4|^5.1",
+        "symfony/translation": "^4.4|^5.1",
+        "symfony/validator": "^4.4|^5.1",
+        "symfony/process": "^4.4|^5.1",
         "symfony/polyfill-iconv": "^1.0",
-        "symfony/yaml": "^4.4",
+        "symfony/yaml": "^4.4|^5.1",
         "typo3/phar-stream-wrapper": "^3.1.3",
         "twig/twig": "^2.12.0",
         "doctrine/reflection": "^1.1",
diff --git a/core/drupalci.yml b/core/drupalci.yml
index 63df934307e..47dac6ea5ce 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -14,6 +14,8 @@ build:
         # phpcs will use core's specified version of Coder.
         sniff-all-files: false
         halt-on-fail: false
+      container_command:
+        commands: "cd ${SOURCE_DIR} && rm -rf vendor/drupal/coder && composer update -n && rm -rf vendor/behat/mink-browserkit-driver && git clonehttps://github.com/Daniel-Marynicz/MinkBrowserKitDriver.git vendor/behat/mink-browserkit-driver"
     testing:
       # run_tests task is executed several times in order of performance speeds.
       # halt-on-fail can be set on the run_tests tasks in order to fail fast.
diff --git a/core/lib/Drupal/Component/DependencyInjection/composer.json b/core/lib/Drupal/Component/DependencyInjection/composer.json
index e370fa3ed78..c364aa687d0 100644
--- a/core/lib/Drupal/Component/DependencyInjection/composer.json
+++ b/core/lib/Drupal/Component/DependencyInjection/composer.json
@@ -12,7 +12,7 @@
   },
   "require": {
     "php": ">=7.3.0",
-    "symfony/dependency-injection": "^4.4",
+    "symfony/dependency-injection": "^4.4|^5.1",
     "symfony/service-contracts": "^1.1|^2"
   },
   "suggest": {
diff --git a/core/lib/Drupal/Component/EventDispatcher/composer.json b/core/lib/Drupal/Component/EventDispatcher/composer.json
index 3574908ffbd..3d19f9682ba 100644
--- a/core/lib/Drupal/Component/EventDispatcher/composer.json
+++ b/core/lib/Drupal/Component/EventDispatcher/composer.json
@@ -6,8 +6,8 @@
   "license": "GPL-2.0-or-later",
   "require": {
     "php": ">=7.3.0",
-    "symfony/dependency-injection": "^4.4",
-    "symfony/event-dispatcher": "^4.4",
+    "symfony/dependency-injection": "^4.4|^5.1",
+    "symfony/event-dispatcher": "^4.4|^5.1",
     "symfony/event-dispatcher-contracts": "^1.1"
   },
   "autoload": {
diff --git a/core/lib/Drupal/Component/HttpFoundation/composer.json b/core/lib/Drupal/Component/HttpFoundation/composer.json
index 0c481d6011f..8e27fffea95 100644
--- a/core/lib/Drupal/Component/HttpFoundation/composer.json
+++ b/core/lib/Drupal/Component/HttpFoundation/composer.json
@@ -6,7 +6,7 @@
   "license": "GPL-2.0-or-later",
   "require": {
     "php": ">=7.3.0",
-    "symfony/http-foundation": "^4.4"
+    "symfony/http-foundation": "^4.4|^5.1"
   },
   "autoload": {
     "psr-4": {
diff --git a/core/lib/Drupal/Component/Plugin/composer.json b/core/lib/Drupal/Component/Plugin/composer.json
index 8814a8ef3a9..388df7369b9 100644
--- a/core/lib/Drupal/Component/Plugin/composer.json
+++ b/core/lib/Drupal/Component/Plugin/composer.json
@@ -6,7 +6,7 @@
   "license": "GPL-2.0-or-later",
   "require": {
     "php": ">=7.3.0",
-    "symfony/validator": "^4.4"
+    "symfony/validator": "^4.4|^5.1"
   },
   "autoload": {
     "psr-4": {
diff --git a/core/lib/Drupal/Component/Serialization/composer.json b/core/lib/Drupal/Component/Serialization/composer.json
index 7b40c55ddc3..8c97ce4b608 100644
--- a/core/lib/Drupal/Component/Serialization/composer.json
+++ b/core/lib/Drupal/Component/Serialization/composer.json
@@ -6,7 +6,7 @@
   "license": "GPL-2.0-or-later",
   "require": {
     "php": ">=7.3.0",
-    "symfony/yaml": "^4.4"
+    "symfony/yaml": "^4.4|^5.1"
   },
   "autoload": {
     "psr-4": {