diff --git a/packages/http_exception/lib/angel_http_exception.dart b/packages/http_exception/lib/angel_http_exception.dart
index cac6145f..f15ebafc 100644
--- a/packages/http_exception/lib/angel_http_exception.dart
+++ b/packages/http_exception/lib/angel_http_exception.dart
@@ -1,6 +1,7 @@
 library angel_http_exception;
 
-import 'package:dart2_constant/convert.dart';
+//import 'package:dart2_constant/convert.dart';
+import 'dart:convert';
 
 /// Exception class that can be serialized to JSON and serialized to clients.
 /// Carries HTTP-specific metadata, like [statusCode].
@@ -45,11 +46,11 @@ class AngelHttpException implements Exception {
 
   @override
   String toString() {
-    return "$statusCode: $message";
+    return '$statusCode: $message';
   }
 
   factory AngelHttpException.fromMap(Map data) {
-    return new AngelHttpException(
+    return AngelHttpException(
       null,
       statusCode: (data['status_code'] ?? data['statusCode']) as int,
       message: data['message']?.toString(),
@@ -60,64 +61,64 @@ class AngelHttpException implements Exception {
   }
 
   factory AngelHttpException.fromJson(String str) =>
-      new AngelHttpException.fromMap(json.decode(str) as Map);
+      AngelHttpException.fromMap(json.decode(str) as Map);
 
   /// Throws a 400 Bad Request error, including an optional arrray of (validation?)
   /// errors you specify.
   factory AngelHttpException.badRequest(
           {String message = '400 Bad Request',
           List<String> errors = const []}) =>
-      new AngelHttpException(null,
+      AngelHttpException(null,
           message: message, errors: errors, statusCode: 400);
 
   /// Throws a 401 Not Authenticated error.
   factory AngelHttpException.notAuthenticated(
           {String message = '401 Not Authenticated'}) =>
-      new AngelHttpException(null, message: message, statusCode: 401);
+      AngelHttpException(null, message: message, statusCode: 401);
 
   /// Throws a 402 Payment Required error.
   factory AngelHttpException.paymentRequired(
           {String message = '402 Payment Required'}) =>
-      new AngelHttpException(null, message: message, statusCode: 402);
+      AngelHttpException(null, message: message, statusCode: 402);
 
   /// Throws a 403 Forbidden error.
   factory AngelHttpException.forbidden({String message = '403 Forbidden'}) =>
-      new AngelHttpException(null, message: message, statusCode: 403);
+      AngelHttpException(null, message: message, statusCode: 403);
 
   /// Throws a 404 Not Found error.
   factory AngelHttpException.notFound({String message = '404 Not Found'}) =>
-      new AngelHttpException(null, message: message, statusCode: 404);
+      AngelHttpException(null, message: message, statusCode: 404);
 
   /// Throws a 405 Method Not Allowed error.
   factory AngelHttpException.methodNotAllowed(
           {String message = '405 Method Not Allowed'}) =>
-      new AngelHttpException(null, message: message, statusCode: 405);
+      AngelHttpException(null, message: message, statusCode: 405);
 
   /// Throws a 406 Not Acceptable error.
   factory AngelHttpException.notAcceptable(
           {String message = '406 Not Acceptable'}) =>
-      new AngelHttpException(null, message: message, statusCode: 406);
+      AngelHttpException(null, message: message, statusCode: 406);
 
   /// Throws a 408 Timeout error.
   factory AngelHttpException.methodTimeout({String message = '408 Timeout'}) =>
-      new AngelHttpException(null, message: message, statusCode: 408);
+      AngelHttpException(null, message: message, statusCode: 408);
 
   /// Throws a 409 Conflict error.
   factory AngelHttpException.conflict({String message = '409 Conflict'}) =>
-      new AngelHttpException(null, message: message, statusCode: 409);
+      AngelHttpException(null, message: message, statusCode: 409);
 
   /// Throws a 422 Not Processable error.
   factory AngelHttpException.notProcessable(
           {String message = '422 Not Processable'}) =>
-      new AngelHttpException(null, message: message, statusCode: 422);
+      AngelHttpException(null, message: message, statusCode: 422);
 
   /// Throws a 501 Not Implemented error.
   factory AngelHttpException.notImplemented(
           {String message = '501 Not Implemented'}) =>
-      new AngelHttpException(null, message: message, statusCode: 501);
+      AngelHttpException(null, message: message, statusCode: 501);
 
   /// Throws a 503 Unavailable error.
   factory AngelHttpException.unavailable(
           {String message = '503 Unavailable'}) =>
-      new AngelHttpException(null, message: message, statusCode: 503);
+      AngelHttpException(null, message: message, statusCode: 503);
 }
diff --git a/packages/http_exception/pubspec.yaml b/packages/http_exception/pubspec.yaml
index cd42d6dc..cf3ec42b 100644
--- a/packages/http_exception/pubspec.yaml
+++ b/packages/http_exception/pubspec.yaml
@@ -4,8 +4,6 @@ description: Exception class that can be serialized to JSON and serialized to cl
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/http_exception
 environment:
-  sdk: ">=2.10.0 <2.12.0"
-dependencies:
-  dart2_constant: ^1.0.0
+  sdk: ">=2.10.0 <3.0.0"
 dev_dependencies:
-  pedantic: ^1.0.0
\ No newline at end of file
+  pedantic: ^1.11.0
\ No newline at end of file