diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 00000000..80e2fa8f
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,160 @@
+# https://docs.github.com/en/actions
+
+name: "CI"
+
+on:
+    pull_request: ~
+    push:
+        branches:
+            - "master"
+
+env:
+    COMPOSER_ROOT_VERSION: 1.99
+
+jobs:
+    coding-standards:
+        name: "Coding Standards"
+
+        runs-on: "ubuntu-latest"
+
+        strategy:
+            matrix:
+                php-version:
+                    - "7.2"
+
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v2.3.4"
+
+            -   name: "Install PHP"
+                uses: "shivammathur/setup-php@2.9.0"
+                with:
+                    coverage: "none"
+                    extensions: "mbstring"
+                    php-version: "${{ matrix.php-version }}"
+
+            -   name: "Validate composer.json and composer.lock"
+                run: "composer validate --strict"
+
+
+            -   name: "Install dependencies with composer"
+                run: "composer update --no-interaction --no-progress"
+
+    static-code-analysis:
+        name: "Static Code Analysis"
+
+        runs-on: "ubuntu-latest"
+
+        strategy:
+            matrix:
+                php-version:
+                    - "7.4"
+
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v2.3.4"
+
+            -   name: "Install PHP"
+                uses: "shivammathur/setup-php@2.9.0"
+                with:
+                    coverage: "none"
+                    extensions: "mbstring"
+                    php-version: "${{ matrix.php-version }}"
+
+            -   name: "Install dependencies with composer"
+                run: "composer update --no-interaction --no-progress && composer i --working-dir=ci"
+
+            -   name: "Run vimeo/psalm"
+                run: "ci/vendor/bin/psalm --threads=4"
+
+    tests:
+        name: "Tests"
+
+        runs-on: "ubuntu-latest"
+
+        strategy:
+            matrix:
+                php-version:
+                    - "5.3"
+                    - "5.4"
+                    - "5.5"
+                    - "5.6"
+                    - "7.0"
+                    - "7.1"
+                    - "7.2"
+                    - "7.3"
+                    - "7.4"
+                    - "8.0"
+
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v2.3.4"
+
+            -   name: "Install PHP"
+                uses: "shivammathur/setup-php@2.9.0"
+                with:
+                    coverage: "none"
+                    extensions: "mbstring"
+                    php-version: "${{ matrix.php-version }}"
+
+            -   name: "Install dependencies with composer"
+                run: "composer update --no-interaction --no-progress"
+
+            -   name: "Run unit tests"
+                run: "vendor/bin/phpunit"
+
+    windows-tests:
+        name: "Windows tests"
+
+        runs-on: "windows-latest"
+
+        strategy:
+            matrix:
+                php-version:
+                    - "7.4"
+
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v2.3.4"
+
+            -   name: "Install PHP"
+                uses: "shivammathur/setup-php@2.9.0"
+                with:
+                    coverage: "none"
+                    extensions: "mbstring"
+                    php-version: "${{ matrix.php-version }}"
+
+            -   name: "Install dependencies with composer"
+                run: "composer update --no-interaction --no-progress"
+
+            -   name: "Run unit tests"
+                run: "vendor/bin/phpunit tests/AssertTest.php"
+
+    code-coverage:
+        name: "Code Coverage"
+
+        runs-on: "ubuntu-latest"
+
+        strategy:
+            matrix:
+                php-version:
+                    - "7.4"
+
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v2.3.4"
+            -   name: "Install PHP"
+                uses: "shivammathur/setup-php@2.9.0"
+                with:
+                    coverage: "pcov"
+                    extensions: "mbstring"
+                    php-version: "${{ matrix.php-version }}"
+
+            -   name: "Install dependencies with composer"
+                run: "composer update --no-interaction --no-progress"
+
+            -   name: "Run unit tests"
+                run: "vendor/bin/phpunit --coverage-clover=coverage.clover"
+
+            -   name: "Upload coverage"
+                run: "wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover"
diff --git a/.gitignore b/.gitignore
index d8ee5b5a..71dec7ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 vendor/
 /composer.lock
+.phpunit.result.cache
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 800b4881..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,45 +0,0 @@
-language: php
-
-cache:
-  directories:
-    - $HOME/.composer/cache/files
-
-matrix:
-  include:
-    - php: 5.3
-      dist: precise
-    - php: 5.4
-      dist: trusty
-    - php: 5.5
-      dist: trusty
-    - php: 5.6
-    - php: 7.0
-    - php: 7.1
-    - php: 7.2
-    - php: 7.3
-      env:
-       - COVERAGE=yes
-       - ANALYSIS=yes
-    - php: 7.4
-    - php: hhvm-3.30
-    - php: nightly
-  allow_failures:
-    - php: nightly
-  fast_finish: true
-
-before_install:
-  - if [[ $COVERAGE != yes ]]; then phpenv config-rm xdebug.ini || true; fi;
-
-install:
-  - if [[ $TRAVIS_PHP_VERSION = hhvm-3.30 ]]; then composer require phpunit/phpunit:4.8.36 --dev; fi
-  - export COMPOSER_FLAGS="--prefer-dist --no-interaction"
-  - if [[ $TRAVIS_PHP_VERSION = nightly ]]; then export COMPOSER_FLAGS="$COMOPSER_FLAGS --ignore-platform-reqs"; fi
-  - composer update $COMPOSER_FLAGS
-
-script:
-  - if [[ $COVERAGE = yes ]]; then vendor/bin/phpunit --coverage-clover=coverage.clover; else vendor/bin/phpunit; fi
-  - if [[ $ANALYSIS = yes ]]; then composer i --working-dir=ci && ci/vendor/bin/psalm; fi
-
-
-after_script:
-  - if [[ $COVERAGE = yes ]]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 9d0c9f50..00000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-build: false
-platform: x86
-clone_folder: c:\projects\webmozart\assert
-
-branches:
-  only:
-    - master
-
-init:
-  - SET PATH=c:\php;%PATH%
-  - SET COMPOSER_NO_INTERACTION=1
-  - SET PHP=1
-
-cache:
-  - '%LOCALAPPDATA%\Composer\files'
-
-install:
-  - ps: Set-Service wuauserv -StartupType Manual
-  - cinst -y php composer
-  - refreshenv
-  - cd c:\tools\php74
-  - copy php.ini-production php.ini /Y
-  - echo date.timezone="UTC" >> php.ini
-  - echo extension_dir=ext >> php.ini
-  - echo extension=php_openssl.dll >> php.ini
-  - echo extension=php_mbstring.dll >> php.ini
-  - echo extension=php_curl.dll >> php.ini
-  - echo memory_limit=3G >> php.ini
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - composer install --no-interaction --no-progress
-
-test_script:
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - vendor\bin\phpunit.bat --verbose
diff --git a/ci/composer.lock b/ci/composer.lock
index a5db46da..db27e2ad 100644
--- a/ci/composer.lock
+++ b/ci/composer.lock
@@ -8,16 +8,16 @@
     "packages": [
         {
             "name": "amphp/amp",
-            "version": "v2.4.3",
+            "version": "v2.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/amp.git",
-                "reference": "23ac95fc6d6973231763f5ed7d1309b39429b974"
+                "reference": "ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/amp/zipball/23ac95fc6d6973231763f5ed7d1309b39429b974",
-                "reference": "23ac95fc6d6973231763f5ed7d1309b39429b974",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c",
+                "reference": "ecdc3c476b3ccff02f8e5d5bcc04f7ccfd18751c",
                 "shasum": ""
             },
             "require": {
@@ -29,8 +29,8 @@
                 "ext-json": "*",
                 "jetbrains/phpstorm-stubs": "^2019.3",
                 "phpunit/phpunit": "^6.0.9 | ^7",
-                "react/promise": "^2",
-                "vimeo/psalm": "^3.11@dev"
+                "psalm/phar": "^3.11@dev",
+                "react/promise": "^2"
             },
             "type": "library",
             "extra": {
@@ -82,32 +82,44 @@
                 "non-blocking",
                 "promise"
             ],
-            "time": "2020-04-19T15:54:21+00:00"
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/amp/issues",
+                "source": "https://github.com/amphp/amp/tree/v2.5.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/amphp",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-03T16:23:45+00:00"
         },
         {
             "name": "amphp/byte-stream",
-            "version": "v1.7.3",
+            "version": "v1.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/byte-stream.git",
-                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592"
+                "reference": "f0c20cf598a958ba2aa8c6e5a71c697d652c7088"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/b867505edb79dda8f253ca3c3a2bbadae4b16592",
-                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/f0c20cf598a958ba2aa8c6e5a71c697d652c7088",
+                "reference": "f0c20cf598a958ba2aa8c6e5a71c697d652c7088",
                 "shasum": ""
             },
             "require": {
-                "amphp/amp": "^2"
+                "amphp/amp": "^2",
+                "php": ">=7.1"
             },
             "require-dev": {
                 "amphp/php-cs-fixer-config": "dev-master",
-                "amphp/phpunit-util": "^1",
+                "amphp/phpunit-util": "^1.4",
                 "friendsofphp/php-cs-fixer": "^2.3",
                 "jetbrains/phpstorm-stubs": "^2019.3",
                 "phpunit/phpunit": "^6 || ^7 || ^8",
-                "vimeo/psalm": "^3.9@dev"
+                "psalm/phar": "^3.11.4"
             },
             "type": "library",
             "extra": {
@@ -147,32 +159,111 @@
                 "non-blocking",
                 "stream"
             ],
-            "time": "2020-04-04T16:56:54+00:00"
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/byte-stream/issues",
+                "source": "https://github.com/amphp/byte-stream/tree/master"
+            },
+            "time": "2020-06-29T18:35:05+00:00"
+        },
+        {
+            "name": "composer/package-versions-deprecated",
+            "version": "1.11.99.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/package-versions-deprecated.git",
+                "reference": "7413f0b55a051e89485c5cb9f765fe24bb02a7b6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/package-versions-deprecated/zipball/7413f0b55a051e89485c5cb9f765fe24bb02a7b6",
+                "reference": "7413f0b55a051e89485c5cb9f765fe24bb02a7b6",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1.1.0 || ^2.0",
+                "php": "^7 || ^8"
+            },
+            "replace": {
+                "ocramius/package-versions": "1.11.99"
+            },
+            "require-dev": {
+                "composer/composer": "^1.9.3 || ^2.0@dev",
+                "ext-zip": "^1.13",
+                "phpunit/phpunit": "^6.5 || ^7"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "PackageVersions\\Installer",
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PackageVersions\\": "src/PackageVersions"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be"
+                }
+            ],
+            "description": "Composer plugin that provides efficient querying for installed package versions (no runtime IO)",
+            "support": {
+                "issues": "https://github.com/composer/package-versions-deprecated/issues",
+                "source": "https://github.com/composer/package-versions-deprecated/tree/1.11.99.1"
+            },
+            "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": "2020-11-11T10:22:58+00:00"
         },
         {
             "name": "composer/semver",
-            "version": "1.5.1",
+            "version": "3.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/semver.git",
-                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de"
+                "reference": "a02fdf930a3c1c3ed3a49b5f63859c0c20e10464"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/semver/zipball/c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
-                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
+                "url": "https://api.github.com/repos/composer/semver/zipball/a02fdf930a3c1c3ed3a49b5f63859c0c20e10464",
+                "reference": "a02fdf930a3c1c3ed3a49b5f63859c0c20e10464",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.2 || ^7.0"
+                "php": "^5.3.2 || ^7.0 || ^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.5 || ^5.0.5"
+                "phpstan/phpstan": "^0.12.54",
+                "symfony/phpunit-bridge": "^4.2 || ^5"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-main": "3.x-dev"
                 }
             },
             "autoload": {
@@ -208,20 +299,39 @@
                 "validation",
                 "versioning"
             ],
-            "time": "2020-01-13T12:06:48+00:00"
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/semver/issues",
+                "source": "https://github.com/composer/semver/tree/3.2.4"
+            },
+            "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": "2020-11-13T08:59:24+00:00"
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "1.4.1",
+            "version": "1.4.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "1ab9842d69e64fb3a01be6b656501032d1b78cb7"
+                "reference": "f28d44c286812c714741478d968104c5e604a1d4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/1ab9842d69e64fb3a01be6b656501032d1b78cb7",
-                "reference": "1ab9842d69e64fb3a01be6b656501032d1b78cb7",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/f28d44c286812c714741478d968104c5e604a1d4",
+                "reference": "f28d44c286812c714741478d968104c5e604a1d4",
                 "shasum": ""
             },
             "require": {
@@ -252,7 +362,63 @@
                 "Xdebug",
                 "performance"
             ],
-            "time": "2020-03-01T12:26:26+00:00"
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/1.4.5"
+            },
+            "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": "2020-11-13T08:04:11+00:00"
+        },
+        {
+            "name": "dnoegel/php-xdg-base-dir",
+            "version": "v0.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/dnoegel/php-xdg-base-dir.git",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/dnoegel/php-xdg-base-dir/zipball/8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~7.0|~6.0|~5.0|~4.8.35"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "XdgBaseDir\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "implementation of xdg base directory specification for php",
+            "support": {
+                "issues": "https://github.com/dnoegel/php-xdg-base-dir/issues",
+                "source": "https://github.com/dnoegel/php-xdg-base-dir/tree/v0.1.1"
+            },
+            "time": "2019-12-04T15:06:13+00:00"
         },
         {
             "name": "felixfbecker/advanced-json-rpc",
@@ -293,31 +459,40 @@
                 }
             ],
             "description": "A more advanced JSONRPC implementation",
+            "support": {
+                "issues": "https://github.com/felixfbecker/php-advanced-json-rpc/issues",
+                "source": "https://github.com/felixfbecker/php-advanced-json-rpc/tree/master"
+            },
             "time": "2020-03-11T15:21:41+00:00"
         },
         {
             "name": "felixfbecker/language-server-protocol",
-            "version": "v1.4.0",
+            "version": "v1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
-                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f"
+                "reference": "85e83cacd2ed573238678c6875f8f0d7ec699541"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/378801f6139bb74ac215d81cca1272af61df9a9f",
-                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/85e83cacd2ed573238678c6875f8f0d7ec699541",
+                "reference": "85e83cacd2ed573238678c6875f8f0d7ec699541",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": ">=7.1"
             },
             "require-dev": {
                 "phpstan/phpstan": "*",
-                "phpunit/phpunit": "^6.3",
-                "squizlabs/php_codesniffer": "^3.1"
+                "squizlabs/php_codesniffer": "^3.1",
+                "vimeo/psalm": "^4.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "LanguageServerProtocol\\": "src/"
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@@ -999,7 +1372,11 @@
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@@ -1033,29 +1410,50 @@
                 "portable",
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-            "time": "2020-03-09T19:04:49+00:00"
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-            "version": "v1.15.0",
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@@ -1091,24 +1489,124 @@
                 "portable",
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-            "time": "2020-02-27T09:26:54+00:00"
+            "support": {
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+                    "type": "tidelift"
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+            "time": "2020-10-23T14:02:19+00:00"
+        },
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+            "name": "symfony/polyfill-php80",
+            "version": "v1.20.0",
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+                "url": "https://github.com/symfony/polyfill-php80.git",
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+            "license": [
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+                {
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+                    "email": "ion.bazan@gmail.com"
+                },
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
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+            "homepage": "https://symfony.com",
+            "keywords": [
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+            },
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+                    "type": "custom"
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+                    "type": "github"
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+            "time": "2020-10-23T14:02:19+00:00"
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-            "version": "v2.0.1",
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@@ -1117,7 +1615,11 @@
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+                    "dev-master": "2.2-dev"
+                },
+                "thanks": {
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+                    "url": "https://github.com/symfony/contracts"
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@@ -1149,7 +1651,107 @@
                 "interoperability",
                 "standards"
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-            "time": "2019-11-18T17:27:11+00:00"
+            "support": {
+                "source": "https://github.com/symfony/service-contracts/tree/master"
+            },
+            "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": "2020-09-07T11:33:47+00:00"
+        },
+        {
+            "name": "symfony/string",
+            "version": "v5.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/string.git",
+                "reference": "40e975edadd4e32cd16f3753b3bad65d9ac48242"
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2.5",
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-intl-grapheme": "~1.0",
+                "symfony/polyfill-intl-normalizer": "~1.0",
+                "symfony/polyfill-mbstring": "~1.0",
+                "symfony/polyfill-php80": "~1.15"
+            },
+            "require-dev": {
+                "symfony/error-handler": "^4.4|^5.0",
+                "symfony/http-client": "^4.4|^5.0",
+                "symfony/translation-contracts": "^1.1|^2",
+                "symfony/var-exporter": "^4.4|^5.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\String\\": ""
+                },
+                "files": [
+                    "Resources/functions.php"
+                ],
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony String component",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "grapheme",
+                "i18n",
+                "string",
+                "unicode",
+                "utf-8",
+                "utf8"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/string/tree/v5.2.0"
+            },
+            "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": "2020-10-24T12:08:07+00:00"
         },
         {
             "name": "vimeo/psalm",
@@ -1168,23 +1770,24 @@
             "require": {
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                 "amphp/byte-stream": "^1.5",
-                "composer/semver": "^1.4",
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+                "composer/semver": "^1.4 || ^2.0 || ^3.0",
                 "composer/xdebug-handler": "^1.1",
+                "dnoegel/php-xdg-base-dir": "^0.1.1",
                 "ext-dom": "*",
                 "ext-json": "*",
                 "ext-libxml": "*",
+                "ext-mbstring": "*",
                 "ext-simplexml": "*",
                 "ext-tokenizer": "*",
                 "felixfbecker/advanced-json-rpc": "^3.0.3",
                 "felixfbecker/language-server-protocol": "^1.4",
-                "netresearch/jsonmapper": "^1.0 || ^2.0",
-                "nikic/php-parser": "^4.3",
-                "ocramius/package-versions": "^1.2",
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0",
+                "nikic/php-parser": "^4.10.1",
                 "openlss/lib-array2xml": "^1.0",
-                "php": "^7.1.3|^8",
+                "php": "^7.1|^8",
                 "sebastian/diff": "^3.0 || ^4.0",
                 "symfony/console": "^3.4.17 || ^4.1.6 || ^5.0",
-                "webmozart/glob": "^4.1",
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@@ -1195,18 +1798,21 @@
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                 "brianium/paratest": "^4.0.0",
                 "ext-curl": "*",
-                "php-coveralls/php-coveralls": "^2.2",
+                "php": "^7.3|^8",
+                "phpdocumentor/reflection-docblock": "^5",
                 "phpmyadmin/sql-parser": "5.1.0",
                 "phpspec/prophecy": ">=1.9.0",
-                "phpunit/phpunit": "^7.5.16 || ^8.5 || ^9.0",
-                "psalm/plugin-phpunit": "^0.10",
+                "phpunit/phpunit": "^9.0",
+                "psalm/plugin-phpunit": "^0.13",
                 "slevomat/coding-standard": "^5.0",
                 "squizlabs/php_codesniffer": "^3.5",
-                "symfony/process": "^4.3"
+                "symfony/process": "^4.3",
+                "weirdan/prophecy-shim": "^1.0 || ^2.0"
             },
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             },
+            "default-branch": true,
             "bin": [
                 "psalm",
                 "psalm-language-server",
@@ -1217,15 +1823,15 @@
             "type": "library",
             "extra": {
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-                    "dev-master": "3.x-dev",
+                    "dev-master": "4.x-dev",
+                    "dev-3.x": "3.x-dev",
                     "dev-2.x": "2.x-dev",
                     "dev-1.x": "1.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psalm\\Plugin\\": "src/Psalm/Plugin",
-                    "Psalm\\": "src/Psalm"
+                    "Psalm\\": "src/Psalm/"
                 },
                 "files": [
                     "src/functions.php",
@@ -1247,27 +1853,32 @@
                 "inspection",
                 "php"
             ],
-            "time": "2020-04-18T15:57:25+00:00"
+            "support": {
+                "issues": "https://github.com/vimeo/psalm/issues",
+                "source": "https://github.com/vimeo/psalm/tree/master"
+            },
+            "time": "2020-12-02T19:49:30+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.8.0",
+            "version": "1.9.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6"
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
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-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "php": "^5.3.3 || ^7.0 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
+                "phpstan/phpstan": "<0.12.20",
                 "vimeo/psalm": "<3.9.1"
             },
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@@ -1295,54 +1906,11 @@
                 "check",
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-            "version": "4.1.0",
-            "source": {
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-                "url": "https://github.com/webmozart/glob.git",
-                "reference": "3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe"
+            "support": {
+                "issues": "https://github.com/webmozart/assert/issues",
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-                "url": "https://api.github.com/repos/webmozart/glob/zipball/3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe",
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-                "php": "^5.3.3|^7.0",
-                "webmozart/path-util": "^2.2"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1",
-                "symfony/filesystem": "^2.5"
-            },
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-            "extra": {
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-                    "dev-master": "4.1-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Glob\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "A PHP implementation of Ant's glob.",
-            "time": "2015-12-29T11:14:33+00:00"
+            "time": "2020-07-08T17:02:28+00:00"
         },
         {
             "name": "webmozart/path-util",
@@ -1388,6 +1956,10 @@
                 }
             ],
             "description": "A robust cross-platform utility for normalizing, comparing and modifying file paths.",
+            "support": {
+                "issues": "https://github.com/webmozart/path-util/issues",
+                "source": "https://github.com/webmozart/path-util/tree/2.3.0"
+            },
             "time": "2015-12-17T08:42:14+00:00"
         }
     ],
@@ -1400,5 +1972,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }
diff --git a/composer.json b/composer.json
index 2e609b63..d15f481c 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
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     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+        "phpunit/phpunit": "^4.8.36 || ^7.5.13 || ^8.5.13"
     },
     "conflict": {
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@@ -34,5 +34,10 @@
             "Webmozart\\Assert\\Tests\\": "tests/",
             "Webmozart\\Assert\\Bin\\": "bin/src"
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.10-dev"
+        }
     }
 }
diff --git a/tests/AssertTest.php b/tests/AssertTest.php
index c1f708b9..d6eea0e6 100644
--- a/tests/AssertTest.php
+++ b/tests/AssertTest.php
@@ -38,7 +38,10 @@ public static function getResource()
         return static::$resource;
     }
 
-    public static function tearDownAfterClass()
+    /**
+     * @afterClass
+     */
+    public static function doTearDownAfterClass()
     {
         @fclose(self::$resource);
     }
diff --git a/tests/ProjectCodeTest.php b/tests/ProjectCodeTest.php
index 71f17709..d7f611c7 100644
--- a/tests/ProjectCodeTest.php
+++ b/tests/ProjectCodeTest.php
@@ -15,7 +15,10 @@ class ProjectCodeTest extends BaseTestCase
     private static $assertDocComment;
     private static $mixinMethodNames;
 
-    public static function setUpBeforeClass()
+    /**
+     * @beforeClass
+     */
+    public static function doSetUpBeforeClass()
     {
         self::$readmeContent = file_get_contents(__DIR__ . '/../README.md');