diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..48b8bf90
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+vendor/
diff --git a/.travis.yml b/.travis.yml
index d2aeb023..b755ca20 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,19 @@
 language: php
 php:
     - "5.4"
-    - "5.3"
     - "5.5"
     - "5.6"
     - "7.0"
+    - "7.1"
     - "nightly"
     - hhvm
-script: phpunit .
 sudo: false
-
+dist: trusty
+matrix:
+    include:
+        -
+            php: "5.3"
+            dist: precise
+            sudo: false
+before_script: rm composer.lock && composer install
+script: ./vendor/phpunit/phpunit/phpunit
diff --git a/README.md b/README.md
index 48a95b21..0d2e55e4 100644
--- a/README.md
+++ b/README.md
@@ -625,7 +625,7 @@ class Sabberworm\CSS\CSSList\Document#4 (2) {
 ## Misc
 
 * Legacy Support: The latest pre-PSR-0 version of this project can be checked with the `0.9.0` tag.
-* Running Tests: To run all unit tests for this project, have `phpunit` installed and run `phpunit .`.
+* Running Tests: To run all unit tests for this project, run `composer install` to install phpunit and use `./vendor/phpunit/phpunit/phpunit`.
 
 ## License
 
diff --git a/composer.json b/composer.json
index b970db75..ace92099 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         "php": ">=5.3.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "*"
+        "phpunit/phpunit": "~4.8"
     },
     "autoload": {
         "psr-0": { "Sabberworm\\CSS": "lib/" }
diff --git a/composer.lock b/composer.lock
index cef0668e..e047bf43 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "bed930f26e019e0a48bd041d15c90e7d",
-    "content-hash": "8a1a6e7f5a04b933b11b9677113dcc44",
+    "content-hash": "e18ad71715023d7c668850babb457c23",
     "packages": [],
     "packages-dev": [
         {
@@ -60,49 +59,7 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14 21:17:01"
-        },
-        {
-            "name": "myclabs/deep-copy",
-            "version": "1.5.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "a8773992b362b58498eed24bf85005f363c34771"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/a8773992b362b58498eed24bf85005f363c34771",
-                "reference": "a8773992b362b58498eed24bf85005f363c34771",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.4.0"
-            },
-            "require-dev": {
-                "doctrine/collections": "1.*",
-                "phpunit/phpunit": "~4.1"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "DeepCopy\\": "src/DeepCopy/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "description": "Create deep copies (clones) of your objects",
-            "homepage": "https://github.com/myclabs/DeepCopy",
-            "keywords": [
-                "clone",
-                "copy",
-                "duplicate",
-                "object",
-                "object graph"
-            ],
-            "time": "2015-11-20 12:04:31"
+            "time": "2015-06-14T21:17:01+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -156,20 +113,20 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27 11:43:31"
+            "time": "2015-12-27T11:43:31+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "3.1.0",
+            "version": "3.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "9270140b940ff02e58ec577c237274e92cd40cdd"
+                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/9270140b940ff02e58ec577c237274e92cd40cdd",
-                "reference": "9270140b940ff02e58ec577c237274e92cd40cdd",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/8331b5efe816ae05461b7ca1e721c01b46bafb3e",
+                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e",
                 "shasum": ""
             },
             "require": {
@@ -201,20 +158,20 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2016-06-10 09:48:41"
+            "time": "2016-09-30T07:12:33+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "0.2",
+            "version": "0.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443"
+                "reference": "e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/b39c7a5b194f9ed7bd0dd345c751007a41862443",
-                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb",
+                "reference": "e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb",
                 "shasum": ""
             },
             "require": {
@@ -248,31 +205,32 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2016-06-10 07:14:17"
+            "time": "2016-11-25T06:54:22+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.6.1",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "58a8137754bc24b25740d4281399a4a3596058e0"
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/58a8137754bc24b25740d4281399a4a3596058e0",
-                "reference": "58a8137754bc24b25740d4281399a4a3596058e0",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
-                "sebastian/comparator": "^1.1",
-                "sebastian/recursion-context": "^1.0"
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.0"
+                "phpspec/phpspec": "^2.5|^3.2",
+                "phpunit/phpunit": "^4.8 || ^5.6.5"
             },
             "type": "library",
             "extra": {
@@ -310,44 +268,43 @@
                 "spy",
                 "stub"
             ],
-            "time": "2016-06-07 08:13:47"
+            "time": "2017-03-02T20:05:34+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "4.0.0",
+            "version": "2.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "900370c81280cc0d942ffbc5912d80464eaee7e9"
+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/900370c81280cc0d942ffbc5912d80464eaee7e9",
-                "reference": "900370c81280cc0d942ffbc5912d80464eaee7e9",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/eabf68b476ac7d0f73793aada060f1c1a9bf8979",
+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0",
+                "php": ">=5.3.3",
                 "phpunit/php-file-iterator": "~1.3",
                 "phpunit/php-text-template": "~1.2",
-                "phpunit/php-token-stream": "^1.4.2",
-                "sebastian/code-unit-reverse-lookup": "~1.0",
+                "phpunit/php-token-stream": "~1.3",
                 "sebastian/environment": "^1.3.2",
-                "sebastian/version": "~1.0|~2.0"
+                "sebastian/version": "~1.0"
             },
             "require-dev": {
                 "ext-xdebug": ">=2.1.4",
-                "phpunit/phpunit": "^5.4"
+                "phpunit/phpunit": "~4"
             },
             "suggest": {
                 "ext-dom": "*",
-                "ext-xdebug": ">=2.4.0",
+                "ext-xdebug": ">=2.2.1",
                 "ext-xmlwriter": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0.x-dev"
+                    "dev-master": "2.2.x-dev"
                 }
             },
             "autoload": {
@@ -373,20 +330,20 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2016-06-03 05:03:56"
+            "time": "2015-10-06T15:47:00+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "1.4.1",
+            "version": "1.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "6150bf2c35d3fc379e50c7602b75caceaa39dbf0"
+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/6150bf2c35d3fc379e50c7602b75caceaa39dbf0",
-                "reference": "6150bf2c35d3fc379e50c7602b75caceaa39dbf0",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
                 "shasum": ""
             },
             "require": {
@@ -420,7 +377,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2015-06-21 13:08:43"
+            "time": "2016-10-03T07:40:28+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -461,29 +418,34 @@
             "keywords": [
                 "template"
             ],
-            "time": "2015-06-21 13:50:34"
+            "time": "2015-06-21T13:50:34+00:00"
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.8",
+            "version": "1.0.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260"
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/38e9124049cf1a164f1e4537caf19c99bf1eb260",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4|~5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -505,20 +467,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2016-05-12 18:03:57"
+            "time": "2017-02-26T11:10:40+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "1.4.8",
+            "version": "1.4.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "3144ae21711fb6cac0b1ab4cbe63b75ce3d4e8da"
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7"
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-                "reference": "3144ae21711fb6cac0b1ab4cbe63b75ce3d4e8da",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/e03f8f67534427a787e21a385a67ec3ca6978ea7",
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7",
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@@ -554,20 +516,20 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2015-09-15 10:49:45"
+            "time": "2017-02-27T10:12:30+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "5.4.6",
+            "version": "4.8.35",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "2f1fc94b77ea6418bd6a06c64a1dac0645fbce59"
+                "reference": "791b1a67c25af50e230f841ee7a9c6eba507dc87"
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-                "reference": "2f1fc94b77ea6418bd6a06c64a1dac0645fbce59",
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@@ -576,27 +538,21 @@
                 "ext-pcre": "*",
                 "ext-reflection": "*",
                 "ext-spl": "*",
-                "myclabs/deep-copy": "~1.3",
-                "php": "^5.6 || ^7.0",
+                "php": ">=5.3.3",
                 "phpspec/prophecy": "^1.3.1",
-                "phpunit/php-code-coverage": "^4.0",
+                "phpunit/php-code-coverage": "~2.1",
                 "phpunit/php-file-iterator": "~1.4",
                 "phpunit/php-text-template": "~1.2",
                 "phpunit/php-timer": "^1.0.6",
-                "phpunit/phpunit-mock-objects": "^3.2",
-                "sebastian/comparator": "~1.1",
+                "phpunit/phpunit-mock-objects": "~2.3",
+                "sebastian/comparator": "~1.2.2",
                 "sebastian/diff": "~1.2",
-                "sebastian/environment": "^1.3 || ^2.0",
+                "sebastian/environment": "~1.3",
                 "sebastian/exporter": "~1.2",
                 "sebastian/global-state": "~1.0",
-                "sebastian/object-enumerator": "~1.0",
-                "sebastian/resource-operations": "~1.0",
-                "sebastian/version": "~1.0|~2.0",
+                "sebastian/version": "~1.0",
                 "symfony/yaml": "~2.1|~3.0"
             },
-            "conflict": {
-                "phpdocumentor/reflection-docblock": "3.0.2"
-            },
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             },
@@ -606,7 +562,7 @@
             "type": "library",
             "extra": {
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-                    "dev-master": "5.4.x-dev"
+                    "dev-master": "4.8.x-dev"
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             "autoload": {
@@ -632,33 +588,30 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2016-06-16 06:01:15"
+            "time": "2017-02-06T05:18:07+00:00"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
-            "version": "3.2.3",
+            "version": "2.3.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit-mock-objects.git",
-                "reference": "b13d0d9426ced06958bd32104653526a6c998a52"
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-                "php": "^5.6 || ^7.0",
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-                "sebastian/exporter": "^1.2"
-            },
-            "conflict": {
-                "phpunit/phpunit": "<5.4.0"
+                "php": ">=5.3.3",
+                "phpunit/php-text-template": "~1.2",
+                "sebastian/exporter": "~1.2"
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-                "phpunit/phpunit": "^5.4"
+                "phpunit/phpunit": "~4.4"
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@@ -666,7 +619,7 @@
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@@ -691,71 +644,26 @@
                 "mock",
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-            "time": "2016-06-12 07:37:26"
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-            "version": "1.0.0",
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-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Looks up which function or method a line of code belongs to",
-            "homepage": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/",
-            "time": "2016-02-13 06:45:14"
+            "time": "2015-10-02T06:51:40+00:00"
         },
         {
             "name": "sebastian/comparator",
-            "version": "1.2.0",
+            "version": "1.2.4",
             "source": {
                 "type": "git",
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