diff --git a/composer.json b/composer.json
index a1cb764..e1b692b 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
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diff --git a/composer.lock b/composer.lock
index 24d8131..2019acc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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@@ -119,7 +119,7 @@
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+            "time": "2015-06-14T21:17:01+00:00"
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+                "guzzle/plugin": "self.version",
+                "guzzle/plugin-async": "self.version",
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+                "guzzlehttp/guzzle": "Guzzle 5 has moved to a new package name. The package you have installed, Guzzle 3, is deprecated."
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                     "email": "mtdowling@gmail.com",
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+                },
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@@ -526,10 +293,10 @@
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@@ -596,40 +363,39 @@
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@@ -655,7 +421,7 @@
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@@ -796,29 +562,29 @@
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-            "time": "2016-10-03T07:35:21+00:00"
+            "time": "2015-06-21T13:59:46+00:00"
         },
         {
             "name": "squizlabs/php_codesniffer",
@@ -1757,30 +1297,24 @@
         },
         {
             "name": "symfony/config",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
-                "reference": "e57211b88aa889fefac1cb36866db04100b0f21c"
+                "reference": "f4f3f1d7090c464434bbbc3e8aa2b41149c59196"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/config/zipball/e57211b88aa889fefac1cb36866db04100b0f21c",
-                "reference": "e57211b88aa889fefac1cb36866db04100b0f21c",
+                "url": "https://api.github.com/repos/symfony/config/zipball/f4f3f1d7090c464434bbbc3e8aa2b41149c59196",
+                "reference": "f4f3f1d7090c464434bbbc3e8aa2b41149c59196",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
-                "symfony/filesystem": "~2.8|~3.0|~4.0"
-            },
-            "conflict": {
-                "symfony/dependency-injection": "<3.3",
-                "symfony/finder": "<3.3"
+                "php": ">=5.3.9",
+                "symfony/filesystem": "~2.3|~3.0.0"
             },
             "require-dev": {
-                "symfony/dependency-injection": "~3.3|~4.0",
-                "symfony/finder": "~3.3|~4.0",
-                "symfony/yaml": "~3.0|~4.0"
+                "symfony/yaml": "~2.7|~3.0.0"
             },
             "suggest": {
                 "symfony/yaml": "To use the yaml reference dumper"
@@ -1788,7 +1322,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -1815,49 +1349,41 @@
             ],
             "description": "Symfony Config Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-14T19:40:10+00:00"
+            "time": "2017-11-07T11:56:23+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "9f21adfb92a9315b73ae2ed43138988ee4913d4e"
+                "reference": "46270f1ca44f08ebc134ce120fd2c2baf5fd63de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/9f21adfb92a9315b73ae2ed43138988ee4913d4e",
-                "reference": "9f21adfb92a9315b73ae2ed43138988ee4913d4e",
+                "url": "https://api.github.com/repos/symfony/console/zipball/46270f1ca44f08ebc134ce120fd2c2baf5fd63de",
+                "reference": "46270f1ca44f08ebc134ce120fd2c2baf5fd63de",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
-                "symfony/debug": "~2.8|~3.0|~4.0",
+                "php": ">=5.3.9",
+                "symfony/debug": "^2.7.2|~3.0.0",
                 "symfony/polyfill-mbstring": "~1.0"
             },
-            "conflict": {
-                "symfony/dependency-injection": "<3.4",
-                "symfony/process": "<3.3"
-            },
             "require-dev": {
                 "psr/log": "~1.0",
-                "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"
+                "symfony/event-dispatcher": "~2.1|~3.0.0",
+                "symfony/process": "~2.1|~3.0.0"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
                 "symfony/event-dispatcher": "",
-                "symfony/lock": "",
                 "symfony/process": ""
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -1884,36 +1410,37 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-14T19:40:10+00:00"
+            "time": "2017-11-29T09:33:18+00:00"
         },
         {
             "name": "symfony/debug",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/debug.git",
-                "reference": "543deab3ffff94402440b326fc94153bae2dfa7a"
+                "reference": "e72a0340dc2e273b3c4398d8eef9157ba51d8b95"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/543deab3ffff94402440b326fc94153bae2dfa7a",
-                "reference": "543deab3ffff94402440b326fc94153bae2dfa7a",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/e72a0340dc2e273b3c4398d8eef9157ba51d8b95",
+                "reference": "e72a0340dc2e273b3c4398d8eef9157ba51d8b95",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
+                "php": ">=5.3.9",
                 "psr/log": "~1.0"
             },
             "conflict": {
                 "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
             },
             "require-dev": {
-                "symfony/http-kernel": "~2.8|~3.0|~4.0"
+                "symfony/class-loader": "~2.2|~3.0.0",
+                "symfony/http-kernel": "~2.3.24|~2.5.9|^2.6.2|~3.0.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -1940,29 +1467,89 @@
             ],
             "description": "Symfony Debug Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-12T08:27:14+00:00"
+            "time": "2017-11-19T19:05:05+00:00"
+        },
+        {
+            "name": "symfony/event-dispatcher",
+            "version": "v2.8.32",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/event-dispatcher.git",
+                "reference": "b59aacf238fadda50d612c9de73b74751872a903"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/b59aacf238fadda50d612c9de73b74751872a903",
+                "reference": "b59aacf238fadda50d612c9de73b74751872a903",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.9"
+            },
+            "require-dev": {
+                "psr/log": "~1.0",
+                "symfony/config": "^2.0.5|~3.0.0",
+                "symfony/dependency-injection": "~2.6|~3.0.0",
+                "symfony/expression-language": "~2.6|~3.0.0",
+                "symfony/stopwatch": "~2.3|~3.0.0"
+            },
+            "suggest": {
+                "symfony/dependency-injection": "",
+                "symfony/http-kernel": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\EventDispatcher\\": ""
+                },
+                "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 EventDispatcher Component",
+            "homepage": "https://symfony.com",
+            "time": "2017-11-05T15:25:56+00:00"
         },
         {
             "name": "symfony/filesystem",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "25b135bea251829e3db6a77d773643408b575ed4"
+                "reference": "15ceb6736a9eebd0d99f9e05a62296ab6ce1cf2b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/25b135bea251829e3db6a77d773643408b575ed4",
-                "reference": "25b135bea251829e3db6a77d773643408b575ed4",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/15ceb6736a9eebd0d99f9e05a62296ab6ce1cf2b",
+                "reference": "15ceb6736a9eebd0d99f9e05a62296ab6ce1cf2b",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": ">=5.3.9"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -1989,7 +1576,7 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-14T19:40:10+00:00"
+            "time": "2017-11-19T18:39:05+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
@@ -2052,25 +1639,25 @@
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "52510fe1aefdc1c5d2076ac6030421d387e689d1"
+                "reference": "533bb9d7c2da1c6d2da163ecf0f22043ea98f59b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/52510fe1aefdc1c5d2076ac6030421d387e689d1",
-                "reference": "52510fe1aefdc1c5d2076ac6030421d387e689d1",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/533bb9d7c2da1c6d2da163ecf0f22043ea98f59b",
+                "reference": "533bb9d7c2da1c6d2da163ecf0f22043ea98f59b",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": ">=5.3.9"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -2097,38 +1684,29 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2017-11-07T14:28:09+00:00"
+            "time": "2017-11-10T18:59:36+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.2",
+            "version": "v2.8.32",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "afe0cd38486505c9703707707d91450cfc1bd536"
+                "reference": "968ef42161e4bc04200119da473077f9e7015128"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/afe0cd38486505c9703707707d91450cfc1bd536",
-                "reference": "afe0cd38486505c9703707707d91450cfc1bd536",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/968ef42161e4bc04200119da473077f9e7015128",
+                "reference": "968ef42161e4bc04200119da473077f9e7015128",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
-            },
-            "conflict": {
-                "symfony/console": "<3.4"
-            },
-            "require-dev": {
-                "symfony/console": "~3.4|~4.0"
-            },
-            "suggest": {
-                "symfony/console": "For validating YAML files using the lint command"
+                "php": ">=5.3.9"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
@@ -2155,57 +1733,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-11T20:38:23+00:00"
-        },
-        {
-            "name": "webmozart/assert",
-            "version": "1.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^5.3.3 || ^7.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
-            "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": "2016-11-23T20:04:58+00:00"
+            "time": "2017-11-29T09:33:18+00:00"
         }
     ],
     "aliases": [],
diff --git a/src/Expander.php b/src/Expander.php
index 0282380..7f5fcef 100644
--- a/src/Expander.php
+++ b/src/Expander.php
@@ -30,7 +30,7 @@ public function __construct()
     /**
      * @return \Grasmash\Expander\StringifierInterface
      */
-    public function getStringifier(): \Grasmash\Expander\StringifierInterface
+    public function getStringifier()
     {
         return $this->stringifier;
     }
@@ -46,7 +46,7 @@ public function setStringifier(\Grasmash\Expander\StringifierInterface $stringif
     /**
      * @return \Psr\Log\LoggerInterface
      */
-    public function getLogger(): \Psr\Log\LoggerInterface
+    public function getLogger()
     {
         return $this->logger;
     }
@@ -280,7 +280,7 @@ public function expandProperty($property_name, $unexpanded_value, $data)
         } else {
             $expanded_value = $data->get($property_name);
             if (is_array($expanded_value)) {
-                $expanded_value = $this->getStringifier()::stringifyArray($expanded_value);
+                $expanded_value = $this->getStringifier()->stringifyArray($expanded_value);
                 return $expanded_value;
             }
             $this->log("Expanding property \${'$property_name'} => $expanded_value.");