diff --git a/composer.json b/composer.json
index c0541a9..26ebd98 100644
--- a/composer.json
+++ b/composer.json
@@ -1,13 +1,13 @@
 {
   "name": "darrynten/pslayers",
   "description": "PHP Imagick Layers",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "type": "library",
   "require": {
     "php": "^7.0",
     "guzzlehttp/guzzle": "^6.2.1",
     "darrynten/any-cache": "^1.0",
-    "symfony/process": "^3.2",
+    "symfony/process": "^4.1",
     "darrynten/imagick-scripts": "~1.0.1"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index 930ce54..83c4b3b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "49f89e31c59d0d0c4a7ad4b96441fde5",
+    "content-hash": "596cb5af878cf5a5ce465f13ebc6813f",
     "packages": [
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             "name": "darrynten/any-cache",
@@ -91,16 +91,16 @@
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             "name": "guzzlehttp/guzzle",
-            "version": "6.3.0",
+            "version": "6.3.3",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba"
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-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/407b0cb880ace85c9b63c5f9551db498cb2d50ba",
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba",
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             "require": {
@@ -110,7 +110,7 @@
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.0 || ^5.0",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
                 "psr/log": "^1.0"
             },
             "suggest": {
@@ -119,7 +119,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.2-dev"
+                    "dev-master": "6.3-dev"
                 }
             },
             "autoload": {
@@ -152,7 +152,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2017-06-22T18:50:49+00:00"
+            "time": "2018-04-22T15:46:56+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -322,25 +322,25 @@
         },
         {
             "name": "symfony/process",
-            "version": "v3.4.4",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "09a5172057be8fc677840e591b17f385e58c7c0d"
+                "reference": "73445bd33b0d337c060eef9652b94df72b6b3434"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/process/zipball/09a5172057be8fc677840e591b17f385e58c7c0d",
-                "reference": "09a5172057be8fc677840e591b17f385e58c7c0d",
+                "url": "https://api.github.com/repos/symfony/process/zipball/73445bd33b0d337c060eef9652b94df72b6b3434",
+                "reference": "73445bd33b0d337c060eef9652b94df72b6b3434",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": "^7.1.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "4.1-dev"
                 }
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             "autoload": {
@@ -367,7 +367,7 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2018-01-29T09:03:43+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
         }
     ],
     "packages-dev": [
@@ -479,12 +479,12 @@
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                 "type": "git",
                 "url": "https://github.com/mockery/mockery.git",
-                "reference": "692466ec21d177bbc06916a18d5ba174e237bb8e"
+                "reference": "99e29d3596b16dabe4982548527d5ddf90232e99"
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-                "url": "https://api.github.com/repos/mockery/mockery/zipball/692466ec21d177bbc06916a18d5ba174e237bb8e",
-                "reference": "692466ec21d177bbc06916a18d5ba174e237bb8e",
+                "url": "https://api.github.com/repos/mockery/mockery/zipball/99e29d3596b16dabe4982548527d5ddf90232e99",
+                "reference": "99e29d3596b16dabe4982548527d5ddf90232e99",
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             },
             "require": {
@@ -493,6 +493,7 @@
                 "php": ">=5.6.0"
             },
             "require-dev": {
+                "phpdocumentor/phpdocumentor": "^2.9",
                 "phpunit/phpunit": "~5.7.10|~6.5"
             },
             "type": "library",
@@ -536,29 +537,32 @@
                 "test double",
                 "testing"
             ],
-            "time": "2018-02-08T11:07:23+00:00"
+            "time": "2018-05-08T08:54:48+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.7.0",
+            "version": "1.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e"
+                "reference": "478465659fd987669df0bd8a9bf22a8710e5f1b6"
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-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
-                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/478465659fd987669df0bd8a9bf22a8710e5f1b6",
+                "reference": "478465659fd987669df0bd8a9bf22a8710e5f1b6",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.1"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
             },
             "require-dev": {
                 "doctrine/collections": "^1.0",
                 "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^4.1"
+                "phpunit/phpunit": "^7.1"
             },
             "type": "library",
             "autoload": {
@@ -581,7 +585,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2017-10-19T19:58:43+00:00"
+            "time": "2018-05-29T17:25:09+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -737,28 +741,28 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.7.3",
+            "version": "1.7.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf"
+                "reference": "33a7e3c4fda54e912ff6338c48823bd5c0f0b712"
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-                "reference": "e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/33a7e3c4fda54e912ff6338c48823bd5c0f0b712",
+                "reference": "33a7e3c4fda54e912ff6338c48823bd5c0f0b712",
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                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
-                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/comparator": "^1.1|^2.0|^3.0",
                 "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
                 "phpspec/phpspec": "^2.5|^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
             },
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             "extra": {
@@ -796,7 +800,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-11-24T13:59:53+00:00"
+            "time": "2018-04-18T13:57:24+00:00"
         },
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@@ -1701,22 +1705,78 @@
             "homepage": "https://github.com/sebastianbergmann/version",
             "time": "2016-10-03T07:35:21+00:00"
         },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.8.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "7cc359f1b7b80fc25ed7796be7d96adc9b354bae"
+            },
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+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/7cc359f1b7b80fc25ed7796be7d96adc9b354bae",
+                "reference": "7cc359f1b7b80fc25ed7796be7d96adc9b354bae",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-04-30T19:57:29+00:00"
+        },
         {
             "name": "symfony/yaml",
-            "version": "v4.0.4",
+            "version": "v4.1.0",
             "source": {
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                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "ffc60bda1d4a00ec0b32eeabf39dc017bf480028"
+                "reference": "80e4bfa9685fc4a09acc4a857ec16974a9cd944e"
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-                "reference": "ffc60bda1d4a00ec0b32eeabf39dc017bf480028",
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             "require": {
-                "php": "^7.1.3"
+                "php": "^7.1.3",
+                "symfony/polyfill-ctype": "~1.8"
             },
             "conflict": {
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@@ -1730,7 +1790,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
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@@ -1757,7 +1817,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2018-01-21T19:06:11+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
         },
         {
             "name": "webmozart/assert",