diff --git a/CHANGELOG.md b/CHANGELOG.md
index fcd3cedbda..78fda3d418 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 9.0.0-wip
+* Remove deprecated `missingCodeBlockLanguage` warning.
+
 ## 8.3.4
 * The URL for category pages now uses _category name_ instead of
   _category `displayName`_.
diff --git a/dartdoc_options.yaml b/dartdoc_options.yaml
index d5550db8cd..7f0e62c36a 100644
--- a/dartdoc_options.yaml
+++ b/dartdoc_options.yaml
@@ -1,4 +1,4 @@
 dartdoc:
   linkToSource:
     root: '.'
-    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v8.3.4/%f%#L%l%'
+    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v9.0.0-wip/%f%#L%l%'
diff --git a/lib/src/version.dart b/lib/src/version.dart
index ca1e6fd8ab..d4c9d66cff 100644
--- a/lib/src/version.dart
+++ b/lib/src/version.dart
@@ -1 +1 @@
-const packageVersion = '8.3.4';
+const packageVersion = '9.0.0-wip';
diff --git a/pubspec.yaml b/pubspec.yaml
index 0e249d1683..4db932ffe2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dartdoc
-version: 8.3.4
+version: 9.0.0-wip
 description: A non-interactive HTML documentation generator for Dart source code.
 repository: https://github.com/dart-lang/dartdoc