diff --git a/composer.json b/composer.json
index eb4ba19..e311336 100644
--- a/composer.json
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index 051db8b..a5bd647 100644
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@@ -211,43 +378,38 @@
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@@ -273,20 +434,24 @@
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@@ -361,26 +526,34 @@
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-            "version": "v3.0.2",
+            "version": "v3.0.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sensiolabs/security-checker.git",
-                "reference": "21696b0daa731064c23cfb694c60a2584a7b6e93"
+                "reference": "59a6a299e2f5612dc8692d40e84373703a5df1b5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sensiolabs/security-checker/zipball/21696b0daa731064c23cfb694c60a2584a7b6e93",
-                "reference": "21696b0daa731064c23cfb694c60a2584a7b6e93",
+                "url": "https://api.github.com/repos/sensiolabs/security-checker/zipball/59a6a299e2f5612dc8692d40e84373703a5df1b5",
+                "reference": "59a6a299e2f5612dc8692d40e84373703a5df1b5",
                 "shasum": ""
             },
             "require": {
@@ -994,23 +1370,24 @@
                 }
             ],
             "description": "A security checker for your composer.lock",
-            "time": "2015-11-07 08:07:40"
+            "time": "2017-03-29T09:29:53+00:00"
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "2.5.1",
+            "version": "2.9.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "6731851d6aaf1d0d6c58feff1065227b7fda3ba8"
+                "reference": "2acf168de78487db620ab4bc524135a13cfe6745"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/6731851d6aaf1d0d6c58feff1065227b7fda3ba8",
-                "reference": "6731851d6aaf1d0d6c58feff1065227b7fda3ba8",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/2acf168de78487db620ab4bc524135a13cfe6745",
+                "reference": "2acf168de78487db620ab4bc524135a13cfe6745",
                 "shasum": ""
             },
             "require": {
+                "ext-simplexml": "*",
                 "ext-tokenizer": "*",
                 "ext-xmlwriter": "*",
                 "php": ">=5.1.2"
@@ -1071,40 +1448,52 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2016-01-19 23:39:10"
+            "time": "2018-11-07T22:31:41+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v2.8.4",
+            "version": "v3.4.43",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "9a5aef5fc0d4eff86853d44202b02be8d5a20154"
+                "reference": "afc7189694d2c59546cf24ea606a236fa46a966e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/9a5aef5fc0d4eff86853d44202b02be8d5a20154",
-                "reference": "9a5aef5fc0d4eff86853d44202b02be8d5a20154",
+                "url": "https://api.github.com/repos/symfony/console/zipball/afc7189694d2c59546cf24ea606a236fa46a966e",
+                "reference": "afc7189694d2c59546cf24ea606a236fa46a966e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9",
+                "php": "^5.5.9|>=7.0.8",
+                "symfony/debug": "~2.8|~3.0|~4.0",
                 "symfony/polyfill-mbstring": "~1.0"
             },
+            "conflict": {
+                "symfony/dependency-injection": "<3.4",
+                "symfony/process": "<3.3"
+            },
+            "provide": {
+                "psr/log-implementation": "1.0"
+            },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/event-dispatcher": "~2.1|~3.0.0",
-                "symfony/process": "~2.1|~3.0.0"
+                "symfony/config": "~3.3|~4.0",
+                "symfony/dependency-injection": "~3.4|~4.0",
+                "symfony/event-dispatcher": "~2.8|~3.0|~4.0",
+                "symfony/lock": "~3.4|~4.0",
+                "symfony/process": "~3.3|~4.0"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
                 "symfony/event-dispatcher": "",
+                "symfony/lock": "",
                 "symfony/process": ""
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -1131,20 +1520,181 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-17 09:19:04"
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-06T08:57:31+00:00"
+        },
+        {
+            "name": "symfony/debug",
+            "version": "v4.4.11",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/debug.git",
+                "reference": "47aa9064d75db36389692dd4d39895a0820f00f2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/47aa9064d75db36389692dd4d39895a0820f00f2",
+                "reference": "47aa9064d75db36389692dd4d39895a0820f00f2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.3",
+                "psr/log": "~1.0",
+                "symfony/polyfill-php80": "^1.15"
+            },
+            "conflict": {
+                "symfony/http-kernel": "<3.4"
+            },
+            "require-dev": {
+                "symfony/http-kernel": "^3.4|^4.0|^5.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Debug\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Debug Component",
+            "homepage": "https://symfony.com",
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-23T08:31:43+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.18.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "1c302646f6efc070cd46856e600e5e0684d6b454"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/1c302646f6efc070cd46856e600e5e0684d6b454",
+                "reference": "1c302646f6efc070cd46856e600e5e0684d6b454",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.18-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-14T12:35:20+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.1.1",
+            "version": "v1.18.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "1289d16209491b584839022f29257ad859b8532d"
+                "reference": "a6977d63bf9a0ad4c65cd352709e230876f9904a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/1289d16209491b584839022f29257ad859b8532d",
-                "reference": "1289d16209491b584839022f29257ad859b8532d",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/a6977d63bf9a0ad4c65cd352709e230876f9904a",
+                "reference": "a6977d63bf9a0ad4c65cd352709e230876f9904a",
                 "shasum": ""
             },
             "require": {
@@ -1156,7 +1706,11 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "1.18-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
                 }
             },
             "autoload": {
@@ -1190,29 +1744,133 @@
                 "portable",
                 "shim"
             ],
-            "time": "2016-01-20 09:13:37"
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-14T12:35:20+00:00"
+        },
+        {
+            "name": "symfony/polyfill-php80",
+            "version": "v1.18.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php80.git",
+                "reference": "d87d5766cbf48d72388a9f6b85f280c8ad51f981"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/d87d5766cbf48d72388a9f6b85f280c8ad51f981",
+                "reference": "d87d5766cbf48d72388a9f6b85f280c8ad51f981",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0.8"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.18-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php80\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ],
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ion Bazan",
+                    "email": "ion.bazan@gmail.com"
+                },
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-14T12:35:20+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.8.4",
+            "version": "v4.4.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "584e52cb8f788a887553ba82db6caacb1d6260bb"
+                "reference": "c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/584e52cb8f788a887553ba82db6caacb1d6260bb",
-                "reference": "584e52cb8f788a887553ba82db6caacb1d6260bb",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a",
+                "reference": "c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=7.1.3",
+                "symfony/polyfill-ctype": "~1.8"
+            },
+            "conflict": {
+                "symfony/console": "<3.4"
+            },
+            "require-dev": {
+                "symfony/console": "^3.4|^4.0|^5.0"
+            },
+            "suggest": {
+                "symfony/console": "For validating YAML files using the lint command"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -1239,16 +1897,89 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-04 07:54:35"
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-20T08:37:50+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.9.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<3.9.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2020-07-08T17:02:28+00:00"
+        }
+    ],
+    "aliases": [
+        {
+            "alias": "4.0.4",
+            "alias_normalized": "4.0.4.0",
+            "version": "dev-4.0-dev",
+            "package": "phpunit/php-code-coverage"
         }
     ],
-    "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {
+        "phpunit/php-code-coverage": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
         "php": ">=5.4"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "1.1.0"
 }
diff --git a/src/EnvironmentVariable.php b/src/EnvironmentVariable.php
index c6a792b..67b90a0 100644
--- a/src/EnvironmentVariable.php
+++ b/src/EnvironmentVariable.php
@@ -36,7 +36,7 @@ protected function getEnvironmentVariable($name)
      */
     protected function getEnvironmentVariables()
     {
-        return array_merge($_ENV, $_SERVER);
+        return array_merge(getenv(), $_SERVER, $_ENV);
     }
 
     /**
diff --git a/test/EnvironmentTest.php b/test/EnvironmentTest.php
index 7ac3410..20a8645 100644
--- a/test/EnvironmentTest.php
+++ b/test/EnvironmentTest.php
@@ -220,6 +220,58 @@ public function testGetAll()
         $this->assertTrue(is_array(Environment::getAll()));
     }
 
+    public function testGetAllReadsEnv()
+    {
+        $_ENV['testGetAllReadsEnv'] = 'test';
+        $vars = Environment::getAll();
+        $this->assertTrue(
+            isset($vars['testGetAllReadsEnv'])
+            && $vars['testGetAllReadsEnv'] == 'test'
+        );
+    }
+
+    public function testGetAllReadsServer()
+    {
+        $_SERVER['testGetAllReadsServer'] = 'test';
+        $vars = Environment::getAll();
+        $this->assertTrue(
+            isset($vars['testGetAllReadsServer'])
+            && $vars['testGetAllReadsServer'] == 'test'
+        );
+    }
+
+    public function testGetAllReadsGetEnv()
+    {
+        putenv('testGetAllReadsGetEnv=test');
+        $vars = Environment::getAll();
+        $this->assertTrue(
+            isset($vars['testGetAllReadsGetEnv'])
+            && $vars['testGetAllReadsGetEnv'] == 'test'
+        );
+    }
+
+    public function testGetAllOverwritesGetEnvWithServer()
+    {
+        putenv('testGetAllOverwritesGetEnvWithServer=test');
+        $_SERVER['testGetAllOverwritesGetEnvWithServer'] = 'server';
+        $vars = Environment::getAll();
+        $this->assertTrue(
+            isset($vars['testGetAllOverwritesGetEnvWithServer'])
+            && $vars['testGetAllOverwritesGetEnvWithServer'] == 'server'
+        );
+    }
+
+    public function testGetAllOverwritesServerWithEnv()
+    {
+        $_SERVER['testGetAllOverwritesServerWithEnv'] = 'server';
+        $_ENV['testGetAllOverwritesServerWithEnv'] = 'env';
+        $vars = Environment::getAll();
+        $this->assertTrue(
+            isset($vars['testGetAllOverwritesServerWithEnv'])
+            && $vars['testGetAllOverwritesServerWithEnv'] == 'env'
+        );
+    }
+
     public function testGetAllWithKeyRegexFilter()
     {
         $_ENV['_ENV'] = 'true';