diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21de8249c5..0c833389a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 8.0.12
+
+ * Allow `markdown-alert` class names in HTML sanitization. (#3820)
+
 ## 8.0.11
 
 * Fix the slash key (`/`) not focusing the search box. (#3810)
diff --git a/dartdoc_options.yaml b/dartdoc_options.yaml
index 184f16408f..5afa418146 100644
--- a/dartdoc_options.yaml
+++ b/dartdoc_options.yaml
@@ -1,4 +1,4 @@
 dartdoc:
   linkToSource:
     root: '.'
-    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v8.0.11/%f%#L%l%'
+    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v8.0.12/%f%#L%l%'
diff --git a/lib/src/render/documentation_renderer.dart b/lib/src/render/documentation_renderer.dart
index 0205aa9f6f..6b814c90cd 100644
--- a/lib/src/render/documentation_renderer.dart
+++ b/lib/src/render/documentation_renderer.dart
@@ -77,7 +77,10 @@ class DocumentationRenderResult {
 }
 
 bool _allowClassName(String className) =>
-    className == 'deprecated' || className.startsWith('language-');
+    className == 'deprecated' ||
+    className.startsWith('language-') ||
+    className == 'markdown-alert' ||
+    className.startsWith('markdown-alert-');
 
 Iterable<String> _addLinkRel(String uriString) {
   final uri = Uri.tryParse(uriString);
diff --git a/lib/src/version.dart b/lib/src/version.dart
index 86f8591bd4..c175110e68 100644
--- a/lib/src/version.dart
+++ b/lib/src/version.dart
@@ -1 +1 @@
-const packageVersion = '8.0.11';
+const packageVersion = '8.0.12';
diff --git a/pubspec.yaml b/pubspec.yaml
index f47e733e11..ff7f45ed10 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dartdoc
-version: 8.0.11
+version: 8.0.12
 description: A non-interactive HTML documentation generator for Dart source code.
 repository: https://github.com/dart-lang/dartdoc