diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 587dbe0..2d1f806 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -9,10 +9,23 @@ on:
 jobs:
   test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        php: [ '7.2', '7.3', '7.4', '8.0' ]
+
+    name: PHP ${{ matrix.php }} test
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@master
+
+    - name: Setup PHP ${{ matrix.php }}
+      uses: nanasess/setup-php@master
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Print php version
+      run: php --version
 
     - name: Validate composer.json and composer.lock
       run: composer validate
@@ -25,6 +38,3 @@ jobs:
 
     - name: Run static analysis
       run: composer run-script analyze
-
-    - name: Print php version
-      run: php --version
diff --git a/.gitignore b/.gitignore
index 304535e..29526f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 .settings
 .buildpath
 .*.swp
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index e495bb7..7f64c53 100644
--- a/composer.json
+++ b/composer.json
@@ -15,8 +15,8 @@
     "ext-bcmath": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^4.0",
-    "phpstan/phpstan": "^0.12.18"
+    "phpunit/phpunit": "^8.0",
+    "phpstan/phpstan": "^0.12.90"
   },
   "scripts": {
      "test": "vendor/bin/phpunit",
diff --git a/composer.lock b/composer.lock
index 16ea0c8..243db59 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,41 +4,36 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "35ca4d60ff48a25a8f8d49d69280b774",
+    "content-hash": "0990b793253279b8556539647a75918e",
     "packages": [],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.3.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1"
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/ae466f726242e637cebdd526a7d991b9433bacf1",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^6.0",
+                "doctrine/coding-standard": "^8.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13",
-                "phpstan/phpstan-phpunit": "^0.11",
-                "phpstan/phpstan-shim": "^0.11",
-                "phpunit/phpunit": "^7.0"
+                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
+                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan-phpunit": "^0.12",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.2.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
@@ -52,7 +47,7 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
@@ -61,32 +56,216 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-10-21T16:45:58+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+            },
+            "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": "2020-11-10T18:47:58+00:00"
         },
         {
-            "name": "phpdocumentor/reflection-common",
-            "version": "2.0.0",
+            "name": "myclabs/deep-copy",
+            "version": "1.10.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/63a995caa1ca9e5590304cd845c15ad6d482a62a",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": "^7.1 || ^8.0"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
             },
             "require-dev": {
-                "phpunit/phpunit": "~6"
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^7.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "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": "3.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/bae7c545bef187884426f042434e561ab1ddb182",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.1.0"
+            },
+            "time": "2021-02-23T14:00:09+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "2.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
@@ -113,32 +292,35 @@
                 "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": "5.1.0",
+            "version": "5.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "cd72d394ca794d3466a3b2fc09d5a6c1dc86b47e"
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/cd72d394ca794d3466a3b2fc09d5a6c1dc86b47e",
-                "reference": "cd72d394ca794d3466a3b2fc09d5a6c1dc86b47e",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/069a785b2141f5bcf49f3e353548dc1cce6df556",
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556",
                 "shasum": ""
             },
             "require": {
-                "ext-filter": "^7.1",
-                "php": "^7.2",
-                "phpdocumentor/reflection-common": "^2.0",
-                "phpdocumentor/type-resolver": "^1.0",
-                "webmozart/assert": "^1"
+                "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",
-                "mockery/mockery": "^1"
+                "mockery/mockery": "~1.3.2"
             },
             "type": "library",
             "extra": {
@@ -166,34 +348,37 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2020-02-22T12:28:44+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/master"
+            },
+            "time": "2020-09-03T19:13:55+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.1.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95"
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/7462d5f123dfc080dfdf26897032a6513644fc95",
-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2",
+                "php": "^7.2 || ^8.0",
                 "phpdocumentor/reflection-common": "^2.0"
             },
             "require-dev": {
-                "ext-tokenizer": "^7.2",
-                "mockery/mockery": "~1"
+                "ext-tokenizer": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-1.x": "1.x-dev"
                 }
             },
             "autoload": {
@@ -212,37 +397,41 @@
                 }
             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2020-02-18T18:59:58+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.4.0"
+            },
+            "time": "2020-09-17T18:55:26+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.10.3",
+            "version": "1.13.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "451c3cd1418cf640de218914901e51b064abb093"
+                "reference": "be1996ed8adc35c3fd795488a653f4b518be70ea"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/451c3cd1418cf640de218914901e51b064abb093",
-                "reference": "451c3cd1418cf640de218914901e51b064abb093",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/be1996ed8adc35c3fd795488a653f4b518be70ea",
+                "reference": "be1996ed8adc35c3fd795488a653f4b518be70ea",
                 "shasum": ""
             },
             "require": {
-                "doctrine/instantiator": "^1.0.2",
-                "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
-                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
+                "doctrine/instantiator": "^1.2",
+                "php": "^7.2 || ~8.0, <8.1",
+                "phpdocumentor/reflection-docblock": "^5.2",
+                "sebastian/comparator": "^3.0 || ^4.0",
+                "sebastian/recursion-context": "^3.0 || ^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5 || ^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
+                "phpspec/phpspec": "^6.0",
+                "phpunit/phpunit": "^8.0 || ^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.10.x-dev"
+                    "dev-master": "1.11.x-dev"
                 }
             },
             "autoload": {
@@ -275,24 +464,31 @@
                 "spy",
                 "stub"
             ],
-            "time": "2020-03-05T15:02:03+00:00"
+            "support": {
+                "issues": "https://github.com/phpspec/prophecy/issues",
+                "source": "https://github.com/phpspec/prophecy/tree/1.13.0"
+            },
+            "time": "2021-03-17T13:42:18+00:00"
         },
         {
             "name": "phpstan/phpstan",
-            "version": "0.12.18",
+            "version": "0.12.90",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "1ce27fe29c8660a27926127d350d53d80c4d4286"
+                "reference": "f0e4b56630fc3d4eb5be86606d07212ac212ede4"
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-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/1ce27fe29c8660a27926127d350d53d80c4d4286",
-                "reference": "1ce27fe29c8660a27926127d350d53d80c4d4286",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/f0e4b56630fc3d4eb5be86606d07212ac212ede4",
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             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
             },
             "bin": [
                 "phpstan",
@@ -314,43 +510,66 @@
                 "MIT"
             ],
             "description": "PHPStan - PHP Static Analysis Tool",
-            "time": "2020-03-22T16:51:47+00:00"
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/0.12.90"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpstan",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-06-18T07:15:38+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "2.2.4",
+            "version": "7.0.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979"
+                "reference": "bb7c9a210c72e4709cdde67f8b7362f672f2225c"
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+                "reference": "75a63c33a8577608444246075ea0af0d052e452a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/bc63e15160866e8730a1f738541b194c401f72bf",
-                "reference": "bc63e15160866e8730a1f738541b194c401f72bf",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/75a63c33a8577608444246075ea0af0d052e452a",
+                "reference": "75a63c33a8577608444246075ea0af0d052e452a",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
-                "symfony/polyfill-ctype": "~1.8"
-            },
-            "conflict": {
-                "symfony/console": "<3.4"
-            },
-            "require-dev": {
-                "symfony/console": "~3.4|~4.0"
-            },
-            "suggest": {
-                "symfony/console": "For validating YAML files using the lint command"
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.4-dev"
-                }
-            },
             "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Yaml\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
+                "classmap": [
+                    "src/"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "MIT"
+                "BSD-3-Clause"
             ],
             "authors": [
                 {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/master"
+            },
+            "funding": [
                 {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
+                    "url": "https://github.com/theseer",
+                    "type": "github"
                 }
             ],
-            "description": "Symfony Yaml Component",
-            "homepage": "https://symfony.com",
-            "time": "2020-01-16T19:04:26+00:00"
+            "time": "2020-07-12T23:59:07+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.7.0",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/aed98a490f9a8f78468232db345ab9cf606cf598",
-                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
-                "vimeo/psalm": "<3.6.0"
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -1228,7 +1838,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2020-02-14T12:15:55+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
+            "time": "2021-03-09T10:59:23+00:00"
         }
     ],
     "aliases": [],
@@ -1240,5 +1854,6 @@
         "php": ">=5.3.0",
         "ext-bcmath": "*"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..075a930
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,35 @@
+version: '3.5'
+
+services:
+    php-56: &php-base
+        image: jtreminio/php-cli:5.6
+        environment:
+            HOME: /tmp
+            COMPOSER_HOME: /tmp/.composer
+        working_dir: /app
+        volumes:
+            - '.:/app'
+
+    php-70:
+        << : *php-base
+        image: jtreminio/php-cli:7.0
+
+    php-71:
+        << : *php-base
+        image: jtreminio/php-cli:7.1
+
+    php-72:
+        << : *php-base
+        image: jtreminio/php-cli:7.2
+
+    php-73:
+        << : *php-base
+        image: jtreminio/php-cli:7.3
+
+    php-74:
+        << : *php-base
+        image: jtreminio/php-cli:7.4
+
+    php-80:
+        << : *php-base
+        image: jtreminio/php-cli:8.0
diff --git a/docker-run b/docker-run
new file mode 100755
index 0000000..894ebbf
--- /dev/null
+++ b/docker-run
@@ -0,0 +1,4 @@
+#!/bin/bash -ex
+
+docker-compose run --rm -u $(id -u):$(id -g) $@
+
diff --git a/tests/CompareTest.php b/tests/CompareTest.php
index fe5ff7d..54588f6 100644
--- a/tests/CompareTest.php
+++ b/tests/CompareTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Tests\RtLopez;
 
-class CompareTest extends \PHPUnit_Framework_TestCase
+class CompareTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
diff --git a/tests/FailureTest.php b/tests/FailureTest.php
index e5d6847..16f73e7 100644
--- a/tests/FailureTest.php
+++ b/tests/FailureTest.php
@@ -1,7 +1,11 @@
 <?php
+
 namespace Tests\RtLopez;
 
-class FailureTest extends \PHPUnit_Framework_TestCase
+use RtLopez\ArithmeticException;
+use RtLopez\ConversionException;
+
+class FailureTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
@@ -12,76 +16,75 @@ class FailureTest extends \PHPUnit_Framework_TestCase
   public function providerClasses()
   {
     $result = array();
-    foreach(self::$_classes as $class)
-    {
+    foreach (self::$_classes as $class) {
       $result[] = array($class);
     }
     return $result;
   }
-  
+
   /**
    * @dataProvider providerClasses
-   * @expectedException  RtLopez\ArithmeticException
    */
   public function testDivisionByZeroInteger($class)
   {
+    $this->expectException(ArithmeticException::class);
     $foo = new $class(1, 1);
-    $foo->div(0); 
+    $foo->div(0);
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException  RtLopez\ArithmeticException
    */
   public function testDivisionByZeroFloat($class)
   {
+    $this->expectException(ArithmeticException::class);
     $foo = new $class(1, 1);
-    $foo->div(0.0); 
+    $foo->div(0.0);
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException  RtLopez\ArithmeticException
    */
   public function testDivisionByZeroDecimal($class)
   {
+    $this->expectException(ArithmeticException::class);
     $foo = new $class(1, 1);
-    $foo->div(new $class(0, 1)); 
+    $foo->div(new $class(0, 1));
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException  RuntimeException
    */
   public function testNegativePrecision($class)
   {
+    $this->expectException(\RuntimeException::class);
     new $class(0, -1);
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException RtLopez\ConversionException
    */
   public function testEmptyValue($class)
   {
+    $this->expectException(ConversionException::class);
     new $class('', 2);
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException RtLopez\ConversionException
    */
   public function testWrongValue($class)
   {
+    $this->expectException(ConversionException::class);
     new $class('notnumber', 2);
   }
 
   /**
    * @dataProvider providerClasses
-   * @expectedException RtLopez\ConversionException
    */
   public function testNullValue($class)
   {
+    $this->expectException(ConversionException::class);
     new $class(null, 2);
   }
 }
diff --git a/tests/FormatTest.php b/tests/FormatTest.php
index bf916f4..3c95936 100644
--- a/tests/FormatTest.php
+++ b/tests/FormatTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Tests\RtLopez;
 
-class FormatTest extends \PHPUnit_Framework_TestCase
+class FormatTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
diff --git a/tests/ImmutableTest.php b/tests/ImmutableTest.php
index 77ebf25..ea8de09 100644
--- a/tests/ImmutableTest.php
+++ b/tests/ImmutableTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Tests\RtLopez;
 
-class ImmutableTest extends \PHPUnit_Framework_TestCase
+class ImmutableTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
diff --git a/tests/MathTest.php b/tests/MathTest.php
index 7fb2b09..afcde0a 100644
--- a/tests/MathTest.php
+++ b/tests/MathTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Tests\RtLopez;
 
-class MathTest extends \PHPUnit_Framework_TestCase
+class MathTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
@@ -169,8 +169,8 @@ public function testDiv($class, $lhs, $rhs, $exp)
     $r = new $class($rhs, 2);
     $res1 = $l->div($r);
     $res2 = $l->div($rhs);
-  
-    $this->assertEquals($exp, sprintf('%.2f', $lhs / $rhs));
+
+    $this->assertEqualsWithDelta($exp, $lhs / $rhs, 0.005);
     $this->assertEquals($exp, ''.$res1);
     $this->assertEquals($exp, ''.$res2);
   }
@@ -240,7 +240,7 @@ public function testPow($class, $lhs, $rhs, $exp)
     $res1 = $l->pow($r);
     $res2 = $l->pow($rhs);
   
-    $this->assertEquals($exp, sprintf('%.4f',(pow($lhs, (int)$rhs))));
+    $this->assertEqualsWithDelta($exp, pow($lhs, (int)$rhs), 0.001);
     $this->assertEquals($exp, ''.$res1);
     $this->assertEquals($exp, ''.$res2);
   }
diff --git a/tests/RoundTest.php b/tests/RoundTest.php
index b030679..9a40ed3 100644
--- a/tests/RoundTest.php
+++ b/tests/RoundTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Tests\RtLopez;
 
-class RoundTest extends \PHPUnit_Framework_TestCase
+class RoundTest extends \PHPUnit\Framework\TestCase
 {
   private static $_classes = array(
     'RtLopez\\DecimalBCMath',
@@ -29,7 +29,7 @@ public function providerRoundConstruct()
       $result[] = array($class,    2, '-2.006',  '-2.01');
       $result[] = array($class,    2, '-2.009',  '-2.01');
       $result[] = array($class,    3, '-2.0999', '-2.1');
-      $result[] = array($class,    3, '-2.00049', '-2.00');
+      $result[] = array($class,    3, '-2.00049', '-2');
     }
     return $result;
   }