diff --git a/lib/convert.js b/lib/convert.js
index 2708a71..457e081 100644
--- a/lib/convert.js
+++ b/lib/convert.js
@@ -2,7 +2,6 @@
 const path = require("path");
 const fs = require("fs").promises;
 const throat = require("throat");
-const serializeToXML = require("xmlserializer").serializeToString;
 const { JSDOM } = require("jsdom");
 const substitutions = require("./substitutions.json");
 
@@ -139,10 +138,11 @@ function getBodyXML(chapter, contentEl) {
     bodyEl.appendChild(contentEl.firstChild);
   }
 
-  let xml = serializeToXML(bodyEl);
+  const xmlSerializer = new contentEl.ownerDocument.defaultView.XMLSerializer();
+  let xml = xmlSerializer.serializeToString(bodyEl);
 
   // Fix recurring strange pattern of extra <br> in <p>...<em>...<br>\n</em></p>
-  xml = xml.replace(/<br\/>\s*<\/em><\/p>/g, "</em></p>");
+  xml = xml.replace(/<br \/>\s*<\/em><\/p>/g, "</em></p>");
 
   // There are way too many nonbreaking spaces where they don't belong.
   // If they show up three in a row, then let them live. Otherwise, they die.
@@ -203,17 +203,17 @@ function getBodyXML(chapter, contentEl) {
   fixEms();
 
   // Similar problems occur in Ward with <b> and <strong> as do in Worm with <em>s
-  xml = xml.replace(/<b\/>/g, "");
-  xml = xml.replace(/<b>(\s*<br\/>\s*)<\/b>/g, "$1");
-  xml = xml.replace(/<strong>(\s*<br\/>\s*)<\/strong>/g, "$1");
+  xml = xml.replace(/<b \/>/g, "");
+  xml = xml.replace(/<b>(\s*<br \/>\s*)<\/b>/g, "$1");
+  xml = xml.replace(/<strong>(\s*<br \/>\s*)<\/strong>/g, "$1");
   xml = xml.replace(/<\/strong>(\s*)<strong>/g, "$1");
   xml = xml.replace(/<strong>@<\/strong>/g, "@");
-  xml = xml.replace(/<br\/>(\s*)<\/strong>/g, "</strong><br/>$1");
+  xml = xml.replace(/<br \/>(\s*)<\/strong>/g, "</strong><br />$1");
   xml = xml.replace(/(\s*)<\/strong>/g, "</strong>$1");
 
   // No need for line breaks before paragraph ends
   // These often occur with the <br>s inside <b>/<strong> fixed above.
-  xml = xml.replace(/<br\/>\s*<\/p>/g, "</p>");
+  xml = xml.replace(/<br \/>\s*<\/p>/g, "</p>");
 
   // Fix possessive of names ending in "s"
   // Note: if the "s" is unvoiced, as in Marquis, then it doesn't get the second "s".
@@ -298,12 +298,12 @@ function getBodyXML(chapter, contentEl) {
   // Use <hr> for separators
   // https://www.parahumans.net/2019/12/21/interlude-18-z-radiation/ has "super-separators" ("⊙ ⊙ ⊙ ⊙ ⊙") which we
   // leave untouched for now.
-  xml = xml.replace(/<p>■<\/p>/g, "<hr/>");
-  xml = xml.replace(/<p style="text-align:center;">■<\/p>/g, "<hr/>");
-  xml = xml.replace(/<p style="text-align: center;">⊙<\/p>/g, "<hr/>");
-  xml = xml.replace(/<p style="text-align: center;"><strong>⊙<\/strong><\/p>/g, "<hr/>");
-  xml = xml.replace(/<p style="text-align: center;"><em><strong>⊙<\/strong><\/em><\/p>/g, "<hr/>");
-  xml = xml.replace(/<p style="text-align: center;"><strong>⊙⊙<\/strong><\/p>/g, "<hr/>");
+  xml = xml.replace(/<p>■<\/p>/g, "<hr />");
+  xml = xml.replace(/<p style="text-align:center;">■<\/p>/g, "<hr />");
+  xml = xml.replace(/<p style="text-align: center;">⊙<\/p>/g, "<hr />");
+  xml = xml.replace(/<p style="text-align: center;"><strong>⊙<\/strong><\/p>/g, "<hr />");
+  xml = xml.replace(/<p style="text-align: center;"><em><strong>⊙<\/strong><\/em><\/p>/g, "<hr />");
+  xml = xml.replace(/<p style="text-align: center;"><strong>⊙⊙<\/strong><\/p>/g, "<hr />");
 
   // Fix recurring miscapitalization with questions
   xml = xml.replace(/\?”\s\s?She asked/g, "?” she asked");
diff --git a/lib/substitutions.json b/lib/substitutions.json
index 0431645..4264abd 100644
--- a/lib/substitutions.json
+++ b/lib/substitutions.json
@@ -5,7 +5,7 @@
       "after": "bugs: flies, ants"
     },
     {
-      "before": "<p><em>Brief note from the author:  This story isn’t intended for young or sensitive readers.  Readers who are on the lookout for <a href=\"http://www.urbandictionary.com/define.php?term=Trigger%20warning&amp;defid=6195009\">trigger warnings</a> are advised to give Worm a pass.</em></p>\n<hr/>\n",
+      "before": "<p><em>Brief note from the author:  This story isn’t intended for young or sensitive readers.  Readers who are on the lookout for <a href=\"http://www.urbandictionary.com/define.php?term=Trigger%20warning&amp;defid=6195009\">trigger warnings</a> are advised to give Worm a pass.</em></p>\n<hr />\n",
       "after": "",
       "_comment": "The pseudo-trigger warning is out of place in an eBook."
     }
@@ -906,15 +906,15 @@
       "after": "crash when the wave rolled"
     },
     {
-      "regExp": "\n ?<em>\\s*([^<]+)</em>(<br/>|</p>)",
+      "regExp": "\n ?<em>\\s*([^<]+)</em>(<br />|</p>)",
       "replacement": "\n<p style=\"padding-left:30px;\"><i>$1</i></p>"
     },
     {
-      "regExp": "\n<p style=\"padding-left:30px;\"><em>([^<]+)</em>(<br/>|</p>)",
+      "regExp": "\n<p style=\"padding-left:30px;\"><em>([^<]+)</em>(<br />|</p>)",
       "replacement": "\n<p style=\"padding-left:30px;\"><i>$1</i></p>"
     },
     {
-      "regExp": "\n<p style=\"padding-left:30px;\"><em>([^<\n]+)<br/>\n([^>\n]+)</em><br/>\n",
+      "regExp": "\n<p style=\"padding-left:30px;\"><em>([^<\n]+)<br />\n([^>\n]+)</em><br />\n",
       "replacement": "\n<p style=\"padding-left:30px;\"><i>$1</i></p>\n<p style=\"padding-left:30px;\"><i>$2</i></p>\n"
     }
   ],
@@ -1770,15 +1770,15 @@
       "replacement": "<p>"
     },
     {
-      "before": "agreed-upon confidentiality.<br/>\n■  ",
+      "before": "agreed-upon confidentiality.<br />\n■  ",
       "after": "agreed-upon confidentiality.</p>\n<ul>\n<li>"
     },
     {
-      "regExp": "<br/>\n■  ",
+      "regExp": "<br />\n■  ",
       "replacement": "</li>\n<li>"
     },
     {
-      "before": "three, male.<br/>\nBoth vials",
+      "before": "three, male.<br />\nBoth vials",
       "after": "three, male.</li>\n</ul>\n<p>Both vials"
     },
     {
@@ -1904,24 +1904,24 @@
       "after": "<p><i>Sweet Honey—</i></p>"
     },
     {
-      "before": "<p><em>Love me, love me, you know you wanna love me…</em><br/>\n<em>Love me, love me, you know you wanna love me…</em></p>",
-      "after": "<p><i>Love me, love me, you know you wanna love me…<br/>\nLove me, love me, you know you wanna love me…</i></p>"
+      "before": "<p><em>Love me, love me, you know you wanna love me…</em><br />\n<em>Love me, love me, you know you wanna love me…</em></p>",
+      "after": "<p><i>Love me, love me, you know you wanna love me…<br />\nLove me, love me, you know you wanna love me…</i></p>"
     },
     {
-      "before": "<p><em>Love me, you?<br/>\nLove me, true?</em></p>",
-      "after": "<p><i>Love me, you?<br/>\nLove me, true?</i></p>"
+      "before": "<p><em>Love me, you?<br />\nLove me, true?</em></p>",
+      "after": "<p><i>Love me, you?<br />\nLove me, true?</i></p>"
     },
     {
-      "before": "<p><em>Crazed, kooky, cracked, crazy,</em> <br/>\n<em>Nutty, barmy, mad for me…</em></p>",
-      "after": "<p><i>Crazed, kooky, cracked, crazy,<br/>\nNutty, barmy, mad for me…</i></p>"
+      "before": "<p><em>Crazed, kooky, cracked, crazy,</em> <br />\n<em>Nutty, barmy, mad for me…</em></p>",
+      "after": "<p><i>Crazed, kooky, cracked, crazy,<br />\nNutty, barmy, mad for me…</i></p>"
     },
     {
-      "before": "<p><em><em>Crazed, kooky, cracked, crazy,</em><br/>\nMental, dotty, whacked, loopy…</em></p>",
-      "after": "<p><i>Crazed, kooky, cracked, crazy,<br/>\nMental, dotty, whacked, loopy…</i></p>"
+      "before": "<p><em><em>Crazed, kooky, cracked, crazy,</em><br />\nMental, dotty, whacked, loopy…</em></p>",
+      "after": "<p><i>Crazed, kooky, cracked, crazy,<br />\nMental, dotty, whacked, loopy…</i></p>"
     },
     {
-      "before": "<p><em>Crazed, kooky, cracked, crazy,<br/>\n<em>Nutty, screwy, mentally diseased…</em><br/>\n</em> She ",
-      "after": "<p><i>Crazed, kooky, cracked, crazy,<br/>\nNutty, screwy, mentally diseased…</i></p>\n<p>She "
+      "before": "<p><em>Crazed, kooky, cracked, crazy,<br />\n<em>Nutty, screwy, mentally diseased…</em><br />\n</em> She ",
+      "after": "<p><i>Crazed, kooky, cracked, crazy,<br />\nNutty, screwy, mentally diseased…</i></p>\n<p>She "
     },
     {
       "before": "<em>Ça va?</em>",
@@ -2206,7 +2206,7 @@
   ],
   "https://parahumans.wordpress.com/2012/09/11/prey-14-3/": [
     {
-      "before": "truck reached<br/>\nthe other Nine",
+      "before": "truck reached<br />\nthe other Nine",
       "after": "truck reached the other Nine"
     },
     {
@@ -2266,7 +2266,7 @@
   ],
   "https://parahumans.wordpress.com/2012/10/18/interlude-15-donation-bonus/": [
     {
-      "before": "volunteered, <em>asked<br/>\n</em> to",
+      "before": "volunteered, <em>asked<br />\n</em> to",
       "after": "volunteered, <em>asked</em> to"
     },
     {
@@ -3365,7 +3365,7 @@
   "https://parahumans.wordpress.com/2013/06/25/interlude-24-donation-bonus-1/": [
     {
       "before": "silence like this.  Divide: They",
-      "after": "silence like this.<br/>  Divide: They"
+      "after": "silence like this.<br />  Divide: They"
     },
     {
       "before": "Bay,” Wanton said. “Not",
@@ -3441,7 +3441,7 @@
     },
     {
       "before": "SimurghNotes",
-      "after": "Simurgh<br/>Notes"
+      "after": "Simurgh<br />Notes"
     },
     {
       "before": "avoided-",
@@ -4238,7 +4238,7 @@
       "after": "Imp: I’ve"
     },
     {
-      "before": "Tattletale:<br/>\nwaiting?",
+      "before": "Tattletale:<br />\nwaiting?",
       "after": "Tattletale: waiting?"
     },
     {
@@ -4308,7 +4308,7 @@
   ],
   "https://www.parahumans.net/2017/09/11/daybreak-1-1/": [
     {
-      "before": "<p>Ward is the second work in the Parahumans series, and reading <strong><a href=\"https://parahumans.wordpress.com/\">Worm</a></strong> first is strongly recommended.  A lot of this won’t make sense otherwise and if you do find yourself a fan of the universe, the spoilers in Ward will affect the reading of the other work.</p>\n<p>Ward is not recommended for young or sensitive readers.</p>\n<hr/>",
+      "before": "<p>Ward is the second work in the Parahumans series, and reading <strong><a href=\"https://parahumans.wordpress.com/\">Worm</a></strong> first is strongly recommended.  A lot of this won’t make sense otherwise and if you do find yourself a fan of the universe, the spoilers in Ward will affect the reading of the other work.</p>\n<p>Ward is not recommended for young or sensitive readers.</p>\n<hr />",
       "after": "",
       "_comment": "This is out of place in an eBook."
     }
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index c5eb93a..599380f 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -2060,11 +2060,6 @@
       "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
       "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
     },
-    "xmlserializer": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/xmlserializer/-/xmlserializer-0.6.1.tgz",
-      "integrity": "sha512-FNb0eEqqUUbnuvxuHqNuKH8qCGKqxu+558Zi8UzOoQk8Z9LdvpONK+v7m3gpKVHrk5Aq+0nNLsKxu/6OYh7Umw=="
-    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/package.json b/package.json
index 90654f3..05b24e9 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,6 @@
     "jsdom": "^16.2.2",
     "requisition": "^1.5.0",
     "throat": "^5.0.0",
-    "xmlserializer": "^0.6.1",
     "yargs": "^15.3.1"
   },
   "devDependencies": {