diff --git a/composer.json b/composer.json
index 6db5976..3cfe219 100644
--- a/composer.json
+++ b/composer.json
@@ -3,9 +3,10 @@
     "description": "Parses HTML5 text into a php DOMDocument",
     "type": "library",
     "require": {
-        "php": "^7.0",
+        "php": "^7.1",
         "ext-dom": "*",
-        "mensbeam/intl": "*"
+        "mensbeam/intl": "*",
+        "mensbeam/mimesniff": "^0.2.0"
     },
     "suggest": {
         "ext-ctype": "Improved performance"
diff --git a/composer.lock b/composer.lock
index 8a6eb1b..8ff9449 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,16 +4,22 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "037fcc961f6e8f68b15379be21f45854",
+    "content-hash": "96a5c225aba74182ddfac27fa5cee1e8",
     "packages": [
         {
             "name": "mensbeam/intl",
             "version": "0.7.0",
             "source": {
                 "type": "git",
-                "url": "https://code.mensbeam.com/MensBeam/intl",
+                "url": "https://github.com/mensbeam/intl.git",
                 "reference": "c4a2ae17142a1846c841c5b5b9246e67d56c568e"
             },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/mensbeam/intl/zipball/c4a2ae17142a1846c841c5b5b9246e67d56c568e",
+                "reference": "c4a2ae17142a1846c841c5b5b9246e67d56c568e",
+                "shasum": ""
+            },
             "require": {
                 "php": "^7.0"
             },
@@ -50,36 +56,80 @@
                 "utf8"
             ],
             "time": "2019-12-21T01:56:59+00:00"
+        },
+        {
+            "name": "mensbeam/mimesniff",
+            "version": "0.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/mensbeam/mime.git",
+                "reference": "d3f6c031687d532c1bb32e3eb362da4a948d4750"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/mensbeam/mime/zipball/d3f6c031687d532c1bb32e3eb362da4a948d4750",
+                "reference": "d3f6c031687d532c1bb32e3eb362da4a948d4750",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.3",
+                "ext-intl": "*"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "MensBeam\\Mime\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "J. King",
+                    "email": "jking@jkingweb.ca",
+                    "homepage": "https://jkingweb.ca/"
+                }
+            ],
+            "description": "An implementation of the WHATWG MIME Sniffing specification",
+            "keywords": [
+                "WHATWG",
+                "mime",
+                "mimesniff"
+            ],
+            "time": "2020-04-19T16:07:41+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "bamarni/composer-bin-plugin",
-            "version": "v1.3.0",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/bamarni/composer-bin-plugin.git",
-                "reference": "67f9d314dc7ecf7245b8637906e151ccc62b8d24"
+                "reference": "9329fb0fbe29e0e1b2db8f4639a193e4f5406225"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/bamarni/composer-bin-plugin/zipball/67f9d314dc7ecf7245b8637906e151ccc62b8d24",
-                "reference": "67f9d314dc7ecf7245b8637906e151ccc62b8d24",
+                "url": "https://api.github.com/repos/bamarni/composer-bin-plugin/zipball/9329fb0fbe29e0e1b2db8f4639a193e4f5406225",
+                "reference": "9329fb0fbe29e0e1b2db8f4639a193e4f5406225",
                 "shasum": ""
             },
             "require": {
-                "composer-plugin-api": "^1.0"
+                "composer-plugin-api": "^1.0 || ^2.0",
+                "php": "^5.5.9 || ^7.0 || ^8.0"
             },
             "require-dev": {
-                "composer/composer": "dev-master",
+                "composer/composer": "^1.0 || ^2.0",
                 "symfony/console": "^2.5 || ^3.0 || ^4.0"
             },
             "type": "composer-plugin",
             "extra": {
-                "class": "Bamarni\\Composer\\Bin\\Plugin",
-                "branch-alias": {
-                    "dev-master": "1.1-dev"
-                }
+                "class": "Bamarni\\Composer\\Bin\\Plugin"
             },
             "autoload": {
                 "psr-4": {
@@ -90,7 +140,16 @@
             "license": [
                 "MIT"
             ],
-            "time": "2019-03-17T12:38:04+00:00"
+            "description": "No conflicts for your bin dependencies",
+            "keywords": [
+                "composer",
+                "conflict",
+                "dependency",
+                "executable",
+                "isolation",
+                "tool"
+            ],
+            "time": "2020-05-03T08:27:20+00:00"
         }
     ],
     "aliases": [],
@@ -99,8 +158,9 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.0",
+        "php": "^7.1",
         "ext-dom": "*"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "1.1.0"
 }
diff --git a/lib/Charset.php b/lib/Charset.php
index 16c40b9..b00accc 100644
--- a/lib/Charset.php
+++ b/lib/Charset.php
@@ -3,6 +3,7 @@ declare(strict_types=1);
 namespace dW\HTML5;
 
 use MensBeam\Intl\Encoding;
+use MensBeam\Mime\MimeType;
 
 abstract class Charset {
     /** Finds a Unicode byte order mark by a byte stream 
@@ -37,58 +38,11 @@ abstract class Charset {
      * @param string $contentType The value of a Content-Type header-field
      */
     public static function fromTransport(string $contentType): ?string {
-        // Try to sniff out a charset from a Content-Type header-field.
-        // This does cut some corners, but should be sufficient for practical use
-        $s = preg_replace("/\s+/", " ", strtolower($contentType));
-        $pos = 0;
-        $end = strlen($s);
-        // skip the type
-        while ($pos < $end && @$s[$pos++] !== "/");
-        // skip the subtype
-        while ($pos < $end && @$s[$pos++] !== ";");
-        // check parameters in sequence
-        while ($pos < $end) {
-            // skip any leading whitespace
-            if (@$s[$pos] === " ") {
-                $pos++;
-            }
-            // collect characters for the parameter name
-            $param = "";
-            while ($pos < $end && @$s[$pos] !== "=") {
-                $param .= @$s[$pos++];
-            }
-            // skip the equals sign
-            $pos++;
-            if ($s[$pos] === '"') {
-                // Value is a quoted-string
-                $pos++;
-                $value = "";
-                while (!in_array($c = @$s[$pos++], ['"', ""])) {
-                    if ($c === "\\") {
-                        $value .= @$s[$pos++];
-                    } else {
-                        $value .= $c;
-                    }
-                }
-                // only interpret the value if a closing quotation mark was seen
-                if ($c !== '"') {
-                    $value = "";
-                }
-            } else {
-                // Value is a bare token
-                $value = "";
-                while (!in_array($c = @$s[$pos++], [';', " ", ""])) {
-                    $value .= $c;
-                }
-            }
-            // if the parameter was the character set, interpret its value and return
-            if ($param === "charset") {
-                $encoding = Encoding::matchLabel($value);
-                if ($encoding) {
-                    return $encoding['name'];
-                } else {
-                    return null;
-                }
+        $type = MimeType::parseBytes($contentType);
+        if ($type && isset($type->params['charset'])) {
+            $encoding = Encoding::matchLabel($type->params['charset']);
+            if ($encoding) {
+                return $encoding['name'];
             }
         }
         return null;