diff --git a/composer.json b/composer.json
index a9b38bff4..2850eb235 100644
--- a/composer.json
+++ b/composer.json
@@ -5,10 +5,13 @@
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     "type": "project",
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+        "php": ">=7.0.5",
         "ext-json": "*",
         "ext-tidy": "*",
         "ext-dom": "*",
+        "ext-xml": "*",
+        "ext-mbstring": "*",
+        "ext-gd": "*",
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@@ -83,7 +86,7 @@
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+            "php": "7.0.5"
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 }
diff --git a/composer.lock b/composer.lock
index 8b7657da2..c524c0999 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
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+    "content-hash": "06219a5c2419ca23ec2924eb31f4ed16",
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-            "version": "3.70.3",
+            "version": "3.82.3",
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                 "url": "https://github.com/aws/aws-sdk-php.git",
-                "reference": "8278052a097a4ebe2b798fab7e2e3c907bc01a47"
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@@ -87,7 +87,7 @@
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@@ -729,30 +729,34 @@
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                 "url": "https://github.com/dompdf/dompdf.git",
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                 "phenx/php-svg-lib": "0.3.*",
                 "php": ">=5.4.0"
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             "require-dev": {
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+                "phpunit/phpunit": "^4.8|^5.5|^6.5",
                 "squizlabs/php_codesniffer": "2.*"
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+            "suggest": {
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+                "ext-gmagick": "Improves image processing performance",
+                "ext-imagick": "Improves image processing performance"
+            },
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@@ -787,20 +791,20 @@
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-            "time": "2017-11-26T14:49:08+00:00"
+            "time": "2018-12-14T02:40:31+00:00"
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-            "version": "2.1.6",
+            "version": "2.1.7",
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                 "url": "https://github.com/egulias/EmailValidator.git",
-                "reference": "0578b32b30b22de3e8664f797cf846fc9246f786"
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-                "reference": "0578b32b30b22de3e8664f797cf846fc9246f786",
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@@ -844,7 +848,7 @@
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-            "time": "2018-09-25T20:47:26+00:00"
+            "time": "2018-12-04T22:38:24+00:00"
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@@ -1116,32 +1120,33 @@
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-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
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-                "psr/http-message": "~1.0"
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5"
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             },
             "require-dev": {
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+                    "dev-master": "1.5-dev"
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@@ -1171,13 +1176,14 @@
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                 "http",
                 "message",
+                "psr-7",
                 "request",
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-            "time": "2017-03-20T17:10:46+00:00"
+            "time": "2018-12-04T20:46:45+00:00"
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@@ -1514,16 +1520,16 @@
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-            "version": "1.0.48",
+            "version": "1.0.49",
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-                "reference": "a6ded5b2f6055e2db97b4b859fdfca2b952b78aa"
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@@ -1594,7 +1600,7 @@
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+            "time": "2018-11-23T23:41:29+00:00"
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@@ -1708,16 +1714,16 @@
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+            "version": "1.24.0",
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                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "fd8c787753b3a2ad11bc60c063cff1358a32a3b4"
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-                "reference": "fd8c787753b3a2ad11bc60c063cff1358a32a3b4",
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@@ -1782,7 +1788,7 @@
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@@ -1885,16 +1891,16 @@
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-                "reference": "1dbd3cb01c5645f3e7deda7aa46ef780d95fcc33"
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-                "reference": "1dbd3cb01c5645f3e7deda7aa46ef780d95fcc33",
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@@ -1902,9 +1908,12 @@
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-                "friendsofphp/php-cs-fixer": "~2",
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+            "suggest": {
+                "friendsofphp/php-cs-fixer": "Needed for the `composer phpcs` command. Allow to automatically fix code style.",
+                "phpstan/phpstan": "Needed for the `composer phpstan` command. Allow to detect potential errors."
+            },
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@@ -1936,7 +1945,7 @@
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-            "time": "2018-09-20T19:36:25+00:00"
+            "time": "2018-11-22T18:23:02+00:00"
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@@ -2211,16 +2220,16 @@
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+            "version": "1.1.0",
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@@ -2254,7 +2263,7 @@
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@@ -2304,6 +2313,46 @@
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+            "version": "2.0.5",
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+                "url": "https://github.com/ralouphie/getallheaders.git",
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+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "time": "2016-02-11T07:05:27+00:00"
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@@ -3667,16 +3716,16 @@
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-            "version": "v3.2.0",
+            "version": "v3.2.1",
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@@ -3731,24 +3780,24 @@
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-            "version": "v2.5.1",
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@@ -3805,20 +3854,20 @@
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-            "time": "2018-09-06T18:41:09+00:00"
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@@ -3854,7 +3903,7 @@
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@@ -3914,16 +3963,16 @@
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@@ -3959,7 +4008,7 @@
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@@ -3990,7 +4039,7 @@
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@@ -4117,16 +4166,16 @@
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             "require": {
@@ -4157,7 +4206,7 @@
                 "Xdebug",
                 "performance"
             ],
-            "time": "2018-08-31T19:07:57+00:00"
+            "time": "2018-11-29T10:59:02+00:00"
         },
         {
             "name": "doctrine/instantiator",
@@ -6020,16 +6069,16 @@
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.3.2",
+            "version": "3.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "6ad28354c04b364c3c71a34e4a18b629cc3b231e"
+                "reference": "379deb987e26c7cd103a7b387aea178baec96e48"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/6ad28354c04b364c3c71a34e4a18b629cc3b231e",
-                "reference": "6ad28354c04b364c3c71a34e4a18b629cc3b231e",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/379deb987e26c7cd103a7b387aea178baec96e48",
+                "reference": "379deb987e26c7cd103a7b387aea178baec96e48",
                 "shasum": ""
             },
             "require": {
@@ -6067,7 +6116,7 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2018-09-23T23:08:17+00:00"
+            "time": "2018-12-19T23:57:18+00:00"
         },
         {
             "name": "symfony/dom-crawler",
@@ -6271,12 +6320,16 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.0.0",
+        "php": ">=7.0.5",
+        "ext-json": "*",
         "ext-tidy": "*",
-        "ext-dom": "*"
+        "ext-dom": "*",
+        "ext-xml": "*",
+        "ext-mbstring": "*",
+        "ext-gd": "*"
     },
     "platform-dev": [],
     "platform-overrides": {
-        "php": "7.0"
+        "php": "7.0.5"
     }
 }