diff --git a/composer.json b/composer.json
index 2637d5b..6db5976 100644
--- a/composer.json
+++ b/composer.json
@@ -4,10 +4,12 @@
     "type": "library",
     "require": {
         "php": "^7.0",
-        "ext-ctype": "*",
-        "ext-hash": "*",
+        "ext-dom": "*",
         "mensbeam/intl": "*"
     },
+    "suggest": {
+        "ext-ctype": "Improved performance"
+    },
     "scripts": {
         "post-install-cmd": ["@composer bin all install"],
         "post-update-cmd": ["@composer bin all update"]
@@ -33,10 +35,10 @@
                 "lib/DOM/traits"
             ]
         },
-        "classmap": ["lib/Token.php"]
+        "classmap": ["lib/Token.php"],
+        "files": ["lib/ctype.php"]
     },
     "autoload-dev": {
-        "files": ["lib/Token.php"],
         "psr-4": {
             "dW\\HTML5\\Test\\": "tests/lib/",
             "dW\\HTML5\\TestCase\\": "tests/cases/"
diff --git a/composer.lock b/composer.lock
index 33bd1eb..8a6eb1b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7f73d57a54597e507dfcbd1a6d40b779",
+    "content-hash": "037fcc961f6e8f68b15379be21f45854",
     "packages": [
         {
             "name": "mensbeam/intl",
@@ -100,8 +100,7 @@
     "prefer-lowest": false,
     "platform": {
         "php": "^7.0",
-        "ext-ctype": "*",
-        "ext-hash": "*"
+        "ext-dom": "*"
     },
     "platform-dev": []
 }
diff --git a/lib/ctype.php b/lib/ctype.php
new file mode 100644
index 0000000..bcf9343
--- /dev/null
+++ b/lib/ctype.php
@@ -0,0 +1,30 @@
+<?php
+namespace dW\HTML5;
+
+// This file adds shims for matching single characters 
+//  using the same API as the ctype extension, if the
+//  extension is missing. They are not a complete
+//  replacement, as they are designed only to evaluate
+//  single characters
+
+if (!extension_loaded("ctype")) {
+    function ctype_alnum(string $str): bool {
+        return ["a"=>true,"b"=>true,"c"=>true,"d"=>true,"e"=>true,"f"=>true,"g"=>true,"h"=>true,"i"=>true,"j"=>true,"k"=>true,"l"=>true,"m"=>true,"n"=>true,"o"=>true,"p"=>true,"q"=>true,"r"=>true,"s"=>true,"t"=>true,"u"=>true,"v"=>true,"w"=>true,"x"=>true,"y"=>true,"z"=>true,"A"=>true,"B"=>true,"C"=>true,"D"=>true,"E"=>true,"F"=>true,"G"=>true,"H"=>true,"I"=>true,"J"=>true,"K"=>true,"L"=>true,"M"=>true,"N"=>true,"O"=>true,"P"=>true,"Q"=>true,"R"=>true,"S"=>true,"T"=>true,"U"=>true,"V"=>true,"W"=>true,"X"=>true,"Y"=>true,"Z"=>true,"0"=>true,"1"=>true,"2"=>true,"3"=>true,"4"=>true,"5"=>true,"6"=>true,"7"=>true,"8"=>true,"9"=>true][$str] ?? false;
+    }
+
+    function ctype_alpha(string $str): bool {
+        return ["a"=>true,"b"=>true,"c"=>true,"d"=>true,"e"=>true,"f"=>true,"g"=>true,"h"=>true,"i"=>true,"j"=>true,"k"=>true,"l"=>true,"m"=>true,"n"=>true,"o"=>true,"p"=>true,"q"=>true,"r"=>true,"s"=>true,"t"=>true,"u"=>true,"v"=>true,"w"=>true,"x"=>true,"y"=>true,"z"=>true,"A"=>true,"B"=>true,"C"=>true,"D"=>true,"E"=>true,"F"=>true,"G"=>true,"H"=>true,"I"=>true,"J"=>true,"K"=>true,"L"=>true,"M"=>true,"N"=>true,"O"=>true,"P"=>true,"Q"=>true,"R"=>true,"S"=>true,"T"=>true,"U"=>true,"V"=>true,"W"=>true,"X"=>true,"Y"=>true,"Z"=>true][$str] ?? false;
+    }
+
+    function ctype_upper(string $str): bool {
+        return ["A"=>true,"B"=>true,"C"=>true,"D"=>true,"E"=>true,"F"=>true,"G"=>true,"H"=>true,"I"=>true,"J"=>true,"K"=>true,"L"=>true,"M"=>true,"N"=>true,"O"=>true,"P"=>true,"Q"=>true,"R"=>true,"S"=>true,"T"=>true,"U"=>true,"V"=>true,"W"=>true,"X"=>true,"Y"=>true,"Z"=>true][$str] ?? false;
+    }
+
+    function ctype_digit(string $str): bool {
+        return ["0"=>true,"1"=>true,"2"=>true,"3"=>true,"4"=>true,"5"=>true,"6"=>true,"7"=>true,"8"=>true,"9"=>true][$str] ?? false;
+    }
+
+    function ctype_xdigit(string $str): bool {
+        return ["a"=>true,"b"=>true,"c"=>true,"d"=>true,"e"=>true,"f"=>true,"A"=>true,"B"=>true,"C"=>true,"D"=>true,"E"=>true,"F"=>true,"0"=>true,"1"=>true,"2"=>true,"3"=>true,"4"=>true,"5"=>true,"6"=>true,"7"=>true,"8"=>true,"9"=>true][$str] ?? false;
+    }
+}
diff --git a/vendor-bin/phpunit/composer.lock b/vendor-bin/phpunit/composer.lock
index 25d6484..5c399b3 100644
--- a/vendor-bin/phpunit/composer.lock
+++ b/vendor-bin/phpunit/composer.lock
@@ -364,16 +364,16 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.10.0",
+            "version": "1.10.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "d638ebbb58daba25a6a0dc7969e1358a0e3c6682"
+                "reference": "cbe1df668b3fe136bcc909126a0f529a78d4cbbc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/d638ebbb58daba25a6a0dc7969e1358a0e3c6682",
-                "reference": "d638ebbb58daba25a6a0dc7969e1358a0e3c6682",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/cbe1df668b3fe136bcc909126a0f529a78d4cbbc",
+                "reference": "cbe1df668b3fe136bcc909126a0f529a78d4cbbc",
                 "shasum": ""
             },
             "require": {
@@ -423,7 +423,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2019-12-17T16:54:23+00:00"
+            "time": "2019-12-22T21:05:45+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",