diff --git a/CHANGELOG.md b/CHANGELOG.md
index 291bc736..929bdc18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,20 @@
+## [3.4.3](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.4.3)
+
+### Enhancements
+
+- Make ["honeypot" `input`](https://github.com/mmistakes/minimal-mistakes/commit/06a8249a69a37dddda7e2a5bfbe32056c1a9a607) in Staticman comment form less obvious to spam bots
+- Add padding to `.highlight` code blocks to better [align `overflow` scrollbar](https://github.com/mmistakes/minimal-mistakes/commit/e4abec0a6f7f8cff72505ca0754615df294fd5b3) to the bottom.
+- Add additional image options for Twitter card social sharing meta tags. [#466](https://github.com/mmistakes/minimal-mistakes/pull/466)
+- Add structured data markup for Staticman comments. [#458](https://github.com/mmistakes/minimal-mistakes/issues/458)
+
+### Bug Fixes
+
+- Format `og:locale` tag with `_` instead of `-`. [#462](https://github.com/mmistakes/minimal-mistakes/issues/462)
+
+### Maintenance
+
+- Add note to docs about using `url: http://localhost:4000` when working locally.
+
 ## [3.4.2](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.4.2)
 
 ### Enhancements
diff --git a/_includes/comment.html b/_includes/comment.html
index ec954f55..44c07d1a 100644
--- a/_includes/comment.html
+++ b/_includes/comment.html
@@ -1,22 +1,22 @@
-<article id="comment{{ include.index }}" class="js-comment comment">
+<article id="comment{{ include.index }}" class="js-comment comment" itemprop="comment" itemscope itemtype="http://schema.org/Comment">
   <div class="comment__avatar-wrapper">
     <img class="comment__avatar" src="https://www.gravatar.com/avatar/{{ include.email }}?d=mm&s=80">
   </div>
   <div class="comment__content-wrapper">
-    <h3 class="comment__author">
+    <h3 class="comment__author" itemprop="author" itemscope itemtype="http://schema.org/Person">
       {% unless include.url == blank %}
-        <a rel="nofollow" href="{{ include.url }}">{{ include.name }}</a>
+        <span itemprop="name"><a rel="external nofollow" itemprop="url" href="{{ include.url }}">{{ include.name }}</a></span>
       {% else %}
-        {{ include.name }}
+        <span itemprop="name">{{ include.name }}</span>
       {% endunless %}
     </h3>
     <p class="comment__date">
       {% if include.date %}
-        {% if include.index %}<a href="#comment{{ include.index }}">{% endif %}
-        <time datetime="{{ include.date | date_to_xmlschema }}">{{ include.date | date: "%B %d, %Y at %I:%M %p" }}</time>
+        {% if include.index %}<a href="#comment{{ include.index }}" itemprop="url">{% endif %}
+        <time datetime="{{ include.date | date_to_xmlschema }}" itemprop="datePublished">{{ include.date | date: "%B %d, %Y at %I:%M %p" }}</time>
         {% if include.index %}</a>{% endif %}
       {% endif %}
     </p>
-    {{ include.message | markdownify }}
+    <div itemprop="text">{{ include.message | markdownify }}</div>
   </div>
 </article>
\ No newline at end of file
diff --git a/_includes/comments.html b/_includes/comments.html
index 53bc5398..39b4983b 100644
--- a/_includes/comments.html
+++ b/_includes/comments.html
@@ -59,9 +59,10 @@
             <label for="comment-form-url">{{ site.data.ui-text[site.locale].comment_form_website_label | default: "Website (optional)" }}</label>
             <input type="url" id="comment-form-url" name="fields[url]" tabindex="4"/>
           </fieldset>
-          <fieldset class="hidden">
+          <fieldset class="hidden" style="display: none;">
             <input type="hidden" name="options[slug]" value="{{ page.slug }}">
-            <input type="hidden" name="fields[hidden]"/>
+            <label for="comment-form-location">Not used. Leave blank if you are a human.</label>
+            <input type="text" id="comment-form-location" name="fields[hidden]" autocomplete="off"/>
           </fieldset>
           <!-- Start comment form alert messaging -->
           <p class="hidden js-notice">
diff --git a/_includes/seo.html b/_includes/seo.html
index a43115b9..ccdd46bc 100644
--- a/_includes/seo.html
+++ b/_includes/seo.html
@@ -39,7 +39,7 @@
   {% assign seo_author_twitter = seo_author_twitter | replace: "@", "" %}
 {% endif %}
 
-<meta property="og:locale" content="{{ site.locale | default: "en" }}">
+<meta property="og:locale" content="{{ site.locale | replace: "-", "_" | default: "en" }}">
 <meta property="og:site_name" content="{{ site.title }}">
 <meta property="og:title" content="{{ page.title | default: site.title | markdownify | strip_html | strip_newlines | escape_once }}">
 
@@ -63,7 +63,9 @@
     <meta name="twitter:image" content="{% if page.header.image contains "://" %}{{ page.header.image }}{% else %}{{ page.header.image | prepend: "/images/" | prepend: base_path }}{% endif %}">
   {% else %}
     <meta name="twitter:card" content="summary">
-    {% if site.og_image %}
+    {% if page.header.teaser %}
+      <meta name="twitter:image" content="{% if page.header.teaser contains "://" %}{{ page.header.teaser }}{% else %}{{ page.header.teaser | prepend: "/images/" | prepend: base_path }}{% endif %}">
+    {% elsif site.og_image %}
       <meta name="twitter:image" content="{{ site.og_image | prepend: "/images/" | prepend: base_path }}">
     {% endif %}
   {% endif %}
@@ -87,6 +89,10 @@
   <meta property="og:image" content="{% if page.header.image contains "://" %}{{ page.header.image }}{% else %}{{ page.header.image | prepend: "/images/" | prepend: base_path }}{% endif %}">
 {% elsif page.header.overlay_image %}
   <meta property="og:image" content="{% if page.header.overlay_image contains "://" %}{{ page.header.overlay_image }}{% else %}{{ page.header.overlay_image | prepend: "/images/" | prepend: base_path }}{% endif %}">
+{% elsif page.header.teaser %}
+  <meta property="og:image" content="{% if page.header.teaser contains "://" %}{{ page.header.teaser }}{% else %}{{ page.header.teaser | prepend: "/images/" | prepend: base_path }}{% endif %}">
+{% elsif site.og_image %}
+  <meta property="og:image" content="{% if site.og_image contains "://" %}{{ site.og_image }}{% else %}{{ site.og_image | prepend: "/images/" | prepend: base_path }}{% endif %}">
 {% endif %}
 
 {% if page.date %}
diff --git a/_sass/_syntax.scss b/_sass/_syntax.scss
index f40ed050..4460297b 100644
--- a/_sass/_syntax.scss
+++ b/_sass/_syntax.scss
@@ -5,7 +5,6 @@
 div.highlighter-rouge, figure.highlight {
   position: relative;
   margin-bottom: 1em;
-  padding: 1em;
   border: 1px solid $border-color;
   border-radius: $border-radius;
   background-color: $code-background-color;
@@ -27,6 +26,7 @@ div.highlighter-rouge, figure.highlight {
 
   .highlight {
     margin: 0;
+    padding: 1em;
     font-family: $monospace;
     font-size: $type-size-7;
     line-height: 1.8;
diff --git a/package.json b/package.json
index 942954c1..723bba0f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "minimal-mistakes",
-  "version": "3.4.2",
+  "version": "3.4.3",
   "description": "Minimal Mistakes Jekyll theme npm build scripts",
   "repository": {
     "type": "git",