diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1ee352982..b76a06527 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,10 @@ jobs:
                         tools: "composer:v2"
                         coverage: "none"
                         git-fetch-depth: 1
+                    -   php: 8.0
+                        tools: "composer:v2"
+                        coverage: "pcov"
+                        git-fetch-depth: 1
 
         steps:
             -   uses: actions/checkout@v2
diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
new file mode 100644
index 000000000..a4a2eab74
--- /dev/null
+++ b/.github/workflows/e2e.yml
@@ -0,0 +1,60 @@
+name: e2e
+
+on:
+    push:
+        branches: [ master ]
+    pull_request:
+
+jobs:
+
+    e2e:
+        runs-on: ubuntu-latest
+        name: ${{ matrix.e2e }} - ${{ matrix.php }}
+        strategy:
+            fail-fast: false
+            matrix:
+                e2e:
+                    - 'e2e_php_settings_checker'
+                    - 'e2e_scoper_alias'
+                    - 'e2e_scoper_whitelist'
+                    - 'e2e_check_requirements'
+                    - 'e2e_symfony'
+                    - 'e2e_composer_installed_versions'
+                php: [ '7.3', '8.0' ]
+                tools: [ 'composer:v2' ]
+
+        steps:
+            -   uses: actions/checkout@v2
+                with:
+                    fetch-depth: 0
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    ini-values: "phar.readonly=0"
+                    tools: ${{ matrix.tools }}
+                    coverage: pcov
+
+            -   name: Get composer cache directory
+                id: composercache
+                run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            -   name: Cache composer dependencies
+                uses: actions/cache@v2
+                with:
+                    path: ${{ steps.composercache.outputs.dir }}
+                    key: composer-${{ runner.os }}-${{ matrix.php }}-${{ hashFiles('composer.*') }}
+                    restore-keys: |
+                        composer-${{ runner.os }}-${{ matrix.php }}-
+                        composer-${{ runner.os }}-
+                        composer-
+
+            -   name: Install dependencies
+                run: composer install --no-interaction --no-progress --no-suggest --prefer-dist
+
+            -   name: Install requirement-checker dependencies
+                run: composer install --no-interaction --no-progress --prefer-dist --working-dir requirement-checker
+
+            -   name: Run e2e ${{ matrix.e2e }}
+                run: make ${{ matrix.e2e }}
diff --git a/composer.json b/composer.json
index 9519c54b4..41a71e8bd 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "php": "^7.3",
+        "php": "^7.3 || ^8.0",
         "ext-phar": "*",
         "amphp/parallel-functions": "^0.1.3",
         "beberlei/assert": "^3.2",
diff --git a/composer.lock b/composer.lock
index afa94dbb6..680645a1c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d6d555fb30209e335a7a25fcd62e2988",
+    "content-hash": "97c48197da161f57152f30e3c8b96a56",
     "packages": [
         {
             "name": "amphp/amp",
-            "version": "v2.5.0",
+            "version": "v2.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/amp.git",
-                "reference": "f220a51458bf4dd0dedebb171ac3457813c72bbc"
+                "reference": "ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/amphp/amp/zipball/f220a51458bf4dd0dedebb171ac3457813c72bbc",
-                "reference": "f220a51458bf4dd0dedebb171ac3457813c72bbc",
+                "url": "https://github.com/gitapi/repos/amphp/amp/zipball/ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c",
+                "reference": "ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c",
                 "shasum": ""
             },
             "require": {
@@ -85,7 +85,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/amphp",
                 "issues": "https://github.com/amphp/amp/issues",
-                "source": "https://github.com/amphp/amp/tree/master"
+                "source": "https://github.com/amphp/amp/tree/v2.5.1"
             },
             "funding": [
                 {
@@ -93,7 +93,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-07-14T21:47:18+00:00"
+            "time": "2020-11-03T16:23:45+00:00"
         },
         {
             "name": "amphp/byte-stream",
@@ -1820,7 +1820,7 @@
             "support": {
                 "source": "https://github.com/JetBrains/phpstorm-stubs/tree/master"
             },
-            "time": "2020-11-17T11:49:11+00:00"
+            "time": "2020-12-03T11:12:10+00:00"
         },
         {
             "name": "justinrainbow/json-schema",
@@ -2005,29 +2005,29 @@
         },
         {
             "name": "opis/closure",
-            "version": "3.5.7",
+            "version": "3.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/opis/closure.git",
-                "reference": "4531e53afe2fc660403e76fb7644e95998bff7bf"
+                "reference": "943b5d70cc5ae7483f6aff6ff43d7e34592ca0f5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/opis/closure/zipball/4531e53afe2fc660403e76fb7644e95998bff7bf",
-                "reference": "4531e53afe2fc660403e76fb7644e95998bff7bf",
+                "url": "https://github.com/gitapi/repos/opis/closure/zipball/943b5d70cc5ae7483f6aff6ff43d7e34592ca0f5",
+                "reference": "943b5d70cc5ae7483f6aff6ff43d7e34592ca0f5",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.4 || ^7.0"
+                "php": "^5.4 || ^7.0 || ^8.0"
             },
             "require-dev": {
                 "jeremeamia/superclosure": "^2.0",
-                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.5.x-dev"
+                    "dev-master": "3.6.x-dev"
                 }
             },
             "autoload": {
@@ -2064,9 +2064,9 @@
             ],
             "support": {
                 "issues": "https://github.com/opis/closure/issues",
-                "source": "https://github.com/opis/closure/tree/3.5.7"
+                "source": "https://github.com/opis/closure/tree/3.6.1"
             },
-            "time": "2020-09-06T17:02:15+00:00"
+            "time": "2020-11-07T02:01:34+00:00"
         },
         {
             "name": "paragonie/constant_time_encoding",
@@ -5230,7 +5230,7 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.3",
+        "php": "^7.3 || ^8.0",
         "ext-phar": "*",
         "composer-plugin-api": "^1.0 || ^2.0"
     },
diff --git a/fixtures/build/dir011/composer.json b/fixtures/build/dir011/composer.json
index 0bc7b5f93..b0367efb8 100644
--- a/fixtures/build/dir011/composer.json
+++ b/fixtures/build/dir011/composer.json
@@ -7,5 +7,5 @@
             "src/functions.php"
         ]
     },
-    "bin": "index.php"
+    "bin": ["index.php"]
 }
diff --git a/fixtures/build/dir012/composer.json b/fixtures/build/dir012/composer.json
index a9e872cfd..92e1d63d8 100644
--- a/fixtures/build/dir012/composer.json
+++ b/fixtures/build/dir012/composer.json
@@ -20,7 +20,7 @@
             "php": "7.2.9"
         }
     },
-    "bin": "bin/console",
+    "bin": ["bin/console"],
     "autoload": {
         "psr-4": {
             "App\\": "src/"
diff --git a/requirement-checker/composer.lock b/requirement-checker/composer.lock
index 0de550e1c..891770f07 100644
--- a/requirement-checker/composer.lock
+++ b/requirement-checker/composer.lock
@@ -66,6 +66,11 @@
                 "validation",
                 "versioning"
             ],
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/semver/issues",
+                "source": "https://github.com/composer/semver/tree/3.2.0"
+            },
             "funding": [
                 {
                     "url": "https://packagist.com",
@@ -86,20 +91,20 @@
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.2.0",
+            "version": "1.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "url": "https://github.com/gitapi/repos/doctrine/instantiator/zipball/f350df0268e904597e3bd9c4685c53e0e333feea",
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
                 "doctrine/coding-standard": "^6.0",
@@ -138,24 +143,42 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-03-17T17:37:11+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.3.x"
+            },
+            "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"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "5796d127b0c4ff505b77455148ea9d5269d99758"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://github.com/gitapi/repos/myclabs/DeepCopy/zipball/5796d127b0c4ff505b77455148ea9d5269d99758",
+                "reference": "5796d127b0c4ff505b77455148ea9d5269d99758",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -186,32 +209,43 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.x"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-06-28T07:02:41+00:00"
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.3",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "url": "https://github.com/gitapi/repos/phar-io/manifest/zipball/85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^2.0",
-                "php": "^5.6 || ^7.0"
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.0.x-dev"
                 }
             },
             "autoload": {
@@ -241,24 +275,28 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2018-07-08T19:23:20+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/master"
+            },
+            "time": "2020-06-27T14:33:11+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "2.0.1",
+            "version": "3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
+                "reference": "c6bb6825def89e0a32220f88337f8ceaf1975fa0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "url": "https://github.com/gitapi/repos/phar-io/version/zipball/c6bb6825def89e0a32220f88337f8ceaf1975fa0",
+                "reference": "c6bb6825def89e0a32220f88337f8ceaf1975fa0",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "autoload": {
@@ -288,32 +326,33 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2018-07-08T19:19:57+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/master"
+            },
+            "time": "2020-06-27T14:39:04+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "2.0.0",
+            "version": "2.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/phpDocumentor/ReflectionCommon/zipball/63a995caa1ca9e5590304cd845c15ad6d482a62a",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "url": "https://github.com/gitapi/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~6"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
@@ -340,44 +379,45 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2018-08-07T13:53:10+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/2.x"
+            },
+            "time": "2020-06-27T09:03:43+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.3.2",
+            "version": "5.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
+                "reference": "3170448f5769fe19f456173d833734e0ff1b84df"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/phpDocumentor/ReflectionDocBlock/zipball/b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
+                "url": "https://github.com/gitapi/repos/phpDocumentor/ReflectionDocBlock/zipball/3170448f5769fe19f456173d833734e0ff1b84df",
+                "reference": "3170448f5769fe19f456173d833734e0ff1b84df",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0",
-                "phpdocumentor/reflection-common": "^1.0.0 || ^2.0.0",
-                "phpdocumentor/type-resolver": "~0.4 || ^1.0.0",
-                "webmozart/assert": "^1.0"
+                "ext-filter": "*",
+                "php": "^7.2 || ^8.0",
+                "phpdocumentor/reflection-common": "^2.2",
+                "phpdocumentor/type-resolver": "^1.3",
+                "webmozart/assert": "^1.9.1"
             },
             "require-dev": {
-                "doctrine/instantiator": "^1.0.5",
-                "mockery/mockery": "^1.0",
-                "phpunit/phpunit": "^6.4"
+                "mockery/mockery": "~1.3.2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.x-dev"
+                    "dev-master": "5.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src/"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -388,38 +428,44 @@
                 {
                     "name": "Mike van Riel",
                     "email": "me@mikevanriel.com"
+                },
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "account@ijaap.nl"
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2019-09-12T14:27:41+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/master"
+            },
+            "time": "2020-07-20T20:05:34+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.0.1",
+            "version": "1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9"
+                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/gitapi/repos/phpDocumentor/TypeResolver/zipball/2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
-                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
+                "url": "https://github.com/gitapi/repos/phpDocumentor/TypeResolver/zipball/e878a14a65245fbe78f8080eba03b47c3b705651",
+                "reference": "e878a14a65245fbe78f8080eba03b47c3b705651",
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+    "plugin-api-version": "2.0.0"
 }
diff --git a/vendor-bin/infection/composer.json b/vendor-bin/infection/composer.json
index 707b7e834..0787caa53 100644
--- a/vendor-bin/infection/composer.json
+++ b/vendor-bin/infection/composer.json
@@ -1,5 +1,5 @@
 {
     "require-dev": {
-        "infection/infection": "^0.15"
+        "infection/infection": "^0.18"
     }
-}
\ No newline at end of file
+}