diff --git a/json_serializable/CHANGELOG.md b/json_serializable/CHANGELOG.md
index 7c14862e2..689716d13 100644
--- a/json_serializable/CHANGELOG.md
+++ b/json_serializable/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 6.9.0-wip
 
 - Use conditional map syntax to clean up `null` handling in `toJson` functions.
+- Require `analyzer: ^6.9.0`
 - Require Dart 3.5
 
 ## 6.8.0
diff --git a/json_serializable/lib/src/field_helpers.dart b/json_serializable/lib/src/field_helpers.dart
index f0b7828e9..c14d0d4b4 100644
--- a/json_serializable/lib/src/field_helpers.dart
+++ b/json_serializable/lib/src/field_helpers.dart
@@ -37,21 +37,21 @@ class _FieldSet implements Comparable<_FieldSet> {
 
   static int _sortByLocation(FieldElement a, FieldElement b) {
     final checkerA = TypeChecker.fromStatic(
-      (a.enclosingElement as InterfaceElement).thisType,
+      (a.enclosingElement3 as InterfaceElement).thisType,
     );
 
-    if (!checkerA.isExactly(b.enclosingElement)) {
+    if (!checkerA.isExactly(b.enclosingElement3)) {
       // in this case, you want to prioritize the enclosingElement that is more
       // "super".
 
-      if (checkerA.isAssignableFrom(b.enclosingElement)) {
+      if (checkerA.isAssignableFrom(b.enclosingElement3)) {
         return -1;
       }
 
       final checkerB = TypeChecker.fromStatic(
-          (b.enclosingElement as InterfaceElement).thisType);
+          (b.enclosingElement3 as InterfaceElement).thisType);
 
-      if (checkerB.isAssignableFrom(a.enclosingElement)) {
+      if (checkerB.isAssignableFrom(a.enclosingElement3)) {
         return 1;
       }
     }
@@ -83,7 +83,7 @@ List<FieldElement> createSortedFieldSet(ClassElement element) {
 
   for (final v in manager.getInheritedConcreteMap2(element).values) {
     assert(v is! FieldElement);
-    if (_dartCoreObjectChecker.isExactly(v.enclosingElement)) {
+    if (_dartCoreObjectChecker.isExactly(v.enclosingElement3)) {
       continue;
     }
 
diff --git a/json_serializable/lib/src/type_helpers/json_converter_helper.dart b/json_serializable/lib/src/type_helpers/json_converter_helper.dart
index ce78f19d1..9958368af 100644
--- a/json_serializable/lib/src/type_helpers/json_converter_helper.dart
+++ b/json_serializable/lib/src/type_helpers/json_converter_helper.dart
@@ -214,7 +214,7 @@ _JsonConvertData? _typeConverterFrom(
 
   final annotationElement = match.elementAnnotation?.element;
   if (annotationElement is PropertyAccessorElement) {
-    final enclosing = annotationElement.enclosingElement;
+    final enclosing = annotationElement.enclosingElement3;
 
     var accessString = annotationElement.name;
 
diff --git a/json_serializable/lib/src/utils.dart b/json_serializable/lib/src/utils.dart
index 782eeb53d..d2f5f3342 100644
--- a/json_serializable/lib/src/utils.dart
+++ b/json_serializable/lib/src/utils.dart
@@ -263,15 +263,15 @@ extension ExecutableElementExtension on ExecutableElement {
     }
 
     if (this is MethodElement) {
-      return '${enclosingElement.name}.$name';
+      return '${enclosingElement3.name}.$name';
     }
 
     if (this is ConstructorElement) {
       // Ignore the default constructor.
       if (name.isEmpty) {
-        return '${enclosingElement.name}';
+        return '${enclosingElement3.name}';
       }
-      return '${enclosingElement.name}.$name';
+      return '${enclosingElement3.name}.$name';
     }
 
     throw UnsupportedError(
diff --git a/json_serializable/pubspec.yaml b/json_serializable/pubspec.yaml
index 854f2c7fd..706fdf5d5 100644
--- a/json_serializable/pubspec.yaml
+++ b/json_serializable/pubspec.yaml
@@ -15,7 +15,7 @@ topics:
 resolution: workspace
 
 dependencies:
-  analyzer: ^6.5.0
+  analyzer: ^6.9.0
   async: ^2.10.0
   build: ^2.4.1
   build_config: ^1.1.0
@@ -36,7 +36,7 @@ dev_dependencies:
     path: ../shared_test
   build_runner: ^2.4.6
   build_verify: ^3.0.0
-  dart_style: ^2.3.2
+  dart_style: ^2.3.7
   logging: ^1.0.0
   source_gen_test: ^1.0.6
   test: ^1.24.4
diff --git a/json_serializable/tool/shared.dart b/json_serializable/tool/shared.dart
index 6565baf9d..2036623b8 100644
--- a/json_serializable/tool/shared.dart
+++ b/json_serializable/tool/shared.dart
@@ -8,7 +8,8 @@ import 'package:build/build.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:yaml/yaml.dart';
 
-final formatter = DartFormatter();
+final formatter =
+    DartFormatter(languageVersion: DartFormatter.latestLanguageVersion);
 
 // Until we have verification in pkg:build and friends
 // https://github.com/dart-lang/build/issues/590