diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42084c70..f984e88a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+# 8.9.1
+
+- Fix for new warning about `operator==` param type.
+
 # 8.9.0
 
 - In `StandardJsonPlugin`, add support for specifying types that should be left
diff --git a/built_value/lib/json_object.dart b/built_value/lib/json_object.dart
index e8a42c9c..c6124b86 100644
--- a/built_value/lib/json_object.dart
+++ b/built_value/lib/json_object.dart
@@ -97,7 +97,7 @@ class BoolJsonObject extends JsonObject {
   bool get asBool => value;
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! BoolJsonObject) return false;
     return value == other.value;
@@ -123,7 +123,7 @@ class ListJsonObject extends JsonObject {
   List<Object?> get asList => value;
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! ListJsonObject) return false;
     return const DeepCollectionEquality().equals(value, other.value);
@@ -149,7 +149,7 @@ class MapJsonObject extends JsonObject {
   Map<String, Object?> get asMap => value;
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! MapJsonObject) return false;
     return const DeepCollectionEquality().equals(value, other.value);
@@ -173,7 +173,7 @@ class NumJsonObject extends JsonObject {
   num get asNum => value;
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! NumJsonObject) return false;
     return value == other.value;
@@ -197,7 +197,7 @@ class StringJsonObject extends JsonObject {
   String get asString => value;
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! StringJsonObject) return false;
     return value == other.value;
diff --git a/built_value/lib/serializer.dart b/built_value/lib/serializer.dart
index c2e0f62e..41e56ae1 100644
--- a/built_value/lib/serializer.dart
+++ b/built_value/lib/serializer.dart
@@ -269,7 +269,7 @@ class FullType {
       : FullType(root, parameters);
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (identical(other, this)) return true;
     if (other is! FullType) return false;
     if (root != other.root) return false;