diff --git a/composer.json b/composer.json
index 70c1a98..a22ba67 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,8 @@
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         "squizlabs/php_codesniffer": "^2.3.1",
-        "phpunit/phpunit": "^5.5"
+        "phpunit/phpunit": "^5.5",
+        "doctrine/instantiator": "1.0.*"
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     "suggest": {
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diff --git a/composer.lock b/composer.lock
index e331e02..f527ef6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
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             "name": "zendframework/zend-json",
@@ -694,16 +694,16 @@
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+            "version": "5.7.25",
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-                "reference": "78532d5269d984660080d8e0f4c99c5c2ea65ffe"
+                "reference": "4b1c822a68ae6577df38a59eb49b046712ec0f6a"
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-                "reference": "78532d5269d984660080d8e0f4c99c5c2ea65ffe",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/4b1c822a68ae6577df38a59eb49b046712ec0f6a",
+                "reference": "4b1c822a68ae6577df38a59eb49b046712ec0f6a",
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@@ -728,7 +728,7 @@
                 "sebastian/object-enumerator": "~2.0",
                 "sebastian/resource-operations": "~1.0",
                 "sebastian/version": "~1.0.3|~2.0",
-                "symfony/yaml": "~2.1|~3.0"
+                "symfony/yaml": "~2.1|~3.0|~4.0"
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             "conflict": {
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@@ -772,7 +772,7 @@
                 "testing",
                 "xunit"
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-            "time": "2017-10-15 06:13:55"
+            "time": "2017-11-14 14:50:51"
         },
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@@ -1475,16 +1475,16 @@
         },
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-            "version": "v3.3.10",
+            "version": "v3.3.13",
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                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "8c7bf1e7d5d6b05a690b715729cb4cd0c0a99c46"
+                "reference": "0938408c4faa518d95230deabb5f595bf0de31b9"
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-                "reference": "8c7bf1e7d5d6b05a690b715729cb4cd0c0a99c46",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/0938408c4faa518d95230deabb5f595bf0de31b9",
+                "reference": "0938408c4faa518d95230deabb5f595bf0de31b9",
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             "require": {
@@ -1526,7 +1526,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-10-05 14:43:42"
+            "time": "2017-11-10 18:26:04"
         },
         {
             "name": "webmozart/assert",