diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb0a84af30..e3b63e1b63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@ Important changes to data models, configuration, and migrations between each
 AppEngine version, listed here to ease deployment and troubleshooting.
 
 ## Next Release (replace with git tag when deployed)
+ * Bumped runtimeVersion to `2024.01.09`.
+ * Upgraded dartdoc to `8.0.3`.
 
 ## `20240102t140400-all`
  * Bumped runtimeVersion to `2023.12.18`.
diff --git a/app/lib/shared/versions.dart b/app/lib/shared/versions.dart
index 0c59043b99..3107ec52a9 100644
--- a/app/lib/shared/versions.dart
+++ b/app/lib/shared/versions.dart
@@ -24,10 +24,10 @@ final RegExp runtimeVersionPattern = RegExp(r'^\d{4}\.\d{2}\.\d{2}$');
 /// when the version switch happens.
 const _acceptedRuntimeVersions = <String>[
   // The current [runtimeVersion].
-  '2023.12.18',
+  '2024.01.09',
   // Fallback runtime versions.
+  '2023.12.18',
   '2023.12.08',
-  '2023.11.28',
 ];
 
 /// Sets the current runtime versions.
@@ -75,5 +75,5 @@ final semanticToolStableFlutterSdkVersion =
 // Value comes from package:pana.
 final String panaVersion = pana.packageVersion;
 
-// keep in-sync with pkg/pub_dartdoc/pubspec.yaml
-final String dartdocVersion = '8.0.0';
+// keep in-sync with pkg/pub-worker/lib/src/bin/pana_wrapper.dart
+final String dartdocVersion = '8.0.3';
diff --git a/pkg/pub_worker/lib/src/bin/pana_wrapper.dart b/pkg/pub_worker/lib/src/bin/pana_wrapper.dart
index a6b1979cd0..075f9dcf14 100644
--- a/pkg/pub_worker/lib/src/bin/pana_wrapper.dart
+++ b/pkg/pub_worker/lib/src/bin/pana_wrapper.dart
@@ -116,7 +116,8 @@ Future<void> main(List<String> args) async {
       if (configDir != null) 'XDG_CONFIG_HOME': configDir,
     },
     useGlobalDartdoc: true,
-    globalDartdocVersion: '8.0.0',
+    // keep in-sync with app/lib/shared/versions.dart
+    globalDartdocVersion: '8.0.3',
   );
 
   //final dartdocOutputDir =
diff --git a/third_party/dartdoc/resources/styles.css b/third_party/dartdoc/resources/styles.css
index 09b85b5188..7db8a1c117 100644
--- a/third_party/dartdoc/resources/styles.css
+++ b/third_party/dartdoc/resources/styles.css
@@ -164,7 +164,6 @@ main {
   flex: 1;
   display: flex;
   flex-direction: row;
-  padding: 20px;
   min-height: 0;
 }
 
@@ -1197,4 +1196,4 @@ li.inherited a {
   a[href]:after {
    content: "" !important;
   }
-}
\ No newline at end of file
+}