diff --git a/eleventy.config.js b/eleventy.config.js
index cde5502c..0cbe9e77 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -53,6 +53,7 @@ export default function (eleventyConfig) {
   eleventyConfig.addPassthroughCopy("src/assets/file");
   eleventyConfig.addPassthroughCopy("src/assets/media");
   eleventyConfig.addPassthroughCopy("src/static");
+  eleventyConfig.addPassthroughCopy({ "src/static/robots.txt": "robots.txt" });
 
   // Keep informal notes separate from the regular post collection.
   eleventyConfig.addCollection("ramblings", (collectionApi) => {
@@ -91,6 +92,10 @@ export default function (eleventyConfig) {
 
   eleventyConfig.addFilter("currentYear", () => new Date().getFullYear());
 
+  eleventyConfig.addFilter("absoluteUrl", (url, base) => {
+    return new URL(url, base).href;
+  });
+
   eleventyConfig.addFilter("newestUpdatedDate", (items = []) => {
     if (!items.length) return new Date();
 
diff --git a/src/_includes/layouts/base.njk b/src/_includes/layouts/base.njk
index 009a68e8..799d5afb 100644
--- a/src/_includes/layouts/base.njk
+++ b/src/_includes/layouts/base.njk
@@ -8,7 +8,7 @@
   <meta property="og:title" content="{{ title or site.title }}">
   <meta property="og:description" content="{{ description or site.description }}">
   <meta property="og:type" content="{% if layout == 'layouts/post.njk' or layout == 'layouts/rambling.njk' %}article{% else %}website{% endif %}">
-  <meta property="og:url" content="{{ site.url }}{{ page.url }}">
+  <meta property="og:url" content="{{ page.url | absoluteUrl(site.url) | escape }}">
   <meta property="og:site_name" content="{{ site.title }}">
   <meta name="twitter:card" content="summary">
   <meta name="twitter:site" content="@{{ site.twitter }}">
@@ -18,6 +18,7 @@
   <meta name="twitter:image" content="{{ site.url }}{{ site.icon }}">
   <link rel="stylesheet" href="/css/main.css">
   <link rel="icon" href="/static/favicon.ico">
+  <link rel="canonical" href="{{ page.url | absoluteUrl(site.url) | escape }}">
   <link rel="alternate" type="application/atom+xml" title="{{ feedTitle or site.title }}" href="{{ feedUrl or '/feed.xml' }}">
 </head>
 <body class="flex flex-col min-h-screen font-sans text-gray-900 bg-white">
diff --git a/src/sitemap.njk b/src/sitemap.njk
index 55c3bff9..6b19d8d2 100644
--- a/src/sitemap.njk
+++ b/src/sitemap.njk
@@ -9,8 +9,9 @@
   {% for page in collections.all %}
     {% if page.url and not page.data.eleventyExcludeFromCollections %}
     <url>
-      <loc>{{ site.url }}{{ page.url }}</loc>
-      <lastmod>{{ page.date | isoDate }}</lastmod>
+      <loc>{{ page.url | absoluteUrl(site.url) | escape }}</loc>
+      {% set lastmod = page.data.updated or page.data.date %}
+      {% if lastmod %}<lastmod>{{ lastmod | isoDate }}</lastmod>{% endif %}
     </url>
     {% endif %}
   {% endfor %}
diff --git a/src/static/robots.txt b/src/static/robots.txt
index 16747ccc..069ee5e5 100644
--- a/src/static/robots.txt
+++ b/src/static/robots.txt
@@ -1,4 +1,4 @@
-Sitemap: https://www.h404bi.com/sitemap.xml
-
 User-agent: *
-Disallow: /drafts
+Allow: /
+
+Sitemap: https://blog.never.pet/sitemap.xml
