diff --git a/composer.json b/composer.json
index 9db4f37..436a1c5 100644
--- a/composer.json
+++ b/composer.json
@@ -58,6 +58,7 @@
         }
     },
     "require-dev": {
-        "symfony/maker-bundle": "^1.11"
+        "symfony/maker-bundle": "^1.11",
+        "symfony/var-dumper": "4.2.*"
     }
 }
diff --git a/composer.lock b/composer.lock
index 16a366d..b1584e7 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d89753f14e5c392b4630fb0be2780e96",
+    "content-hash": "35b114429a6170678ae1592190a9808e",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -1847,6 +1847,137 @@
                 "scaffolding"
             ],
             "time": "2019-01-17T02:02:27+00:00"
+        },
+        {
+            "name": "symfony/polyfill-php72",
+            "version": "v1.10.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php72.git",
+                "reference": "9050816e2ca34a8e916c3a0ae8b9c2fccf68b631"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/9050816e2ca34a8e916c3a0ae8b9c2fccf68b631",
+                "reference": "9050816e2ca34a8e916c3a0ae8b9c2fccf68b631",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php72\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "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 polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "time": "2018-09-21T13:07:52+00:00"
+        },
+        {
+            "name": "symfony/var-dumper",
+            "version": "v4.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/var-dumper.git",
+                "reference": "223bda89f9be41cf7033eeaf11bc61a280489c17"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/223bda89f9be41cf7033eeaf11bc61a280489c17",
+                "reference": "223bda89f9be41cf7033eeaf11bc61a280489c17",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3",
+                "symfony/polyfill-mbstring": "~1.0",
+                "symfony/polyfill-php72": "~1.5"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
+                "symfony/console": "<3.4"
+            },
+            "require-dev": {
+                "ext-iconv": "*",
+                "symfony/console": "~3.4|~4.0",
+                "symfony/process": "~3.4|~4.0",
+                "twig/twig": "~1.34|~2.4"
+            },
+            "suggest": {
+                "ext-iconv": "To convert non-UTF-8 strings to UTF-8 (or symfony/polyfill-iconv in case ext-iconv cannot be used).",
+                "ext-intl": "To show region name in time zone dump",
+                "symfony/console": "To use the ServerDumpCommand and/or the bin/var-dump-server script"
+            },
+            "bin": [
+                "Resources/bin/var-dump-server"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.2-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "Resources/functions/dump.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Component\\VarDumper\\": ""
+                },
+                "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 mechanism for exploring and dumping PHP variables",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "debug",
+                "dump"
+            ],
+            "time": "2019-01-30T11:44:30+00:00"
         }
     ],
     "aliases": [],
diff --git a/symfony.lock b/symfony.lock
index b2e284e..471b832 100644
--- a/symfony.lock
+++ b/symfony.lock
@@ -104,6 +104,9 @@
     "symfony/polyfill-mbstring": {
         "version": "v1.10.0"
     },
+    "symfony/polyfill-php72": {
+        "version": "v1.10.0"
+    },
     "symfony/routing": {
         "version": "4.2",
         "recipe": {
@@ -113,6 +116,9 @@
             "ref": "5374e24d508ba8fd6ba9eb15170255fdb778316a"
         }
     },
+    "symfony/var-dumper": {
+        "version": "v4.2.3"
+    },
     "symfony/var-exporter": {
         "version": "v4.2.3"
     },