diff --git a/analysis_options.yaml b/analysis_options.yaml
index 0a517d6..14c4740 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -20,7 +20,6 @@ linter:
     - always_declare_return_types
     - always_put_control_body_on_new_line
     - always_put_required_named_parameters_first
-    - always_specify_types
     - always_use_package_imports
     - annotate_overrides
     - annotate_redeclares
@@ -117,7 +116,7 @@ linter:
     - null_check_on_nullable_type_parameter
     - null_closures
     - one_member_abstracts
-    - only_throw_errors
+#    - only_throw_errors
     - overridden_fields
     - package_api_docs
     - package_names
@@ -132,14 +131,12 @@ linter:
     - prefer_const_constructors_in_immutables
     - prefer_const_declarations
     - prefer_const_literals_to_create_immutables
-    - prefer_constructors_over_static_methods
     - prefer_contains
     - prefer_double_quotes
-    - prefer_expression_function_bodies
     - prefer_final_fields
     - prefer_final_in_for_each
-    - prefer_final_locals
-    - prefer_final_parameters
+#    - prefer_final_locals
+#    - prefer_final_parameters
     - prefer_for_elements_to_map_fromIterable
     - prefer_foreach
     - prefer_function_declarations_over_variables
diff --git a/lib/messages.dart b/lib/messages.dart
index 31eadad..7317e3d 100644
--- a/lib/messages.dart
+++ b/lib/messages.dart
@@ -1 +1 @@
-export 'src/messages/hello.dart' show Hello;
+export "src/messages/hello.dart" show Hello;
diff --git a/lib/serializers.dart b/lib/serializers.dart
index 2c1b8bc..517b850 100644
--- a/lib/serializers.dart
+++ b/lib/serializers.dart
@@ -1 +1 @@
-export 'src/serializers/json.dart' show JsonSerializer;
+export "src/serializers/json.dart" show JsonSerializer;
diff --git a/lib/src/messages/hello.dart b/lib/src/messages/hello.dart
index 60cad0b..349d0b4 100644
--- a/lib/src/messages/hello.dart
+++ b/lib/src/messages/hello.dart
@@ -1,6 +1,8 @@
-import 'message.dart';
+import "package:wampproto/src/messages/message.dart";
 
 class Hello implements Message {
+
+  Hello(this.realm, this.roles, this.authID, this.authMethods);
   static const int id = 1;
 
   final String realm;
@@ -8,9 +10,7 @@ class Hello implements Message {
   final String authID;
   final List<String> authMethods;
 
-  Hello(this.realm, this.roles, this.authID, this.authMethods);
-
-  static Hello parse(List<dynamic> message) {
+  static Hello parse(final List<dynamic> message) {
     if (message.length < 2) {
       throw ArgumentError("invalid hello message");
     }
@@ -22,7 +22,7 @@ class Hello implements Message {
 
     if (type != Hello.id) {
       throw ArgumentError(
-          "invalid message type: must be ${Hello.id}, was $type");
+          "invalid message type: must be ${Hello.id}, was $type",);
     }
 
     final realm = message[1];
@@ -44,7 +44,5 @@ class Hello implements Message {
   }
 
   @override
-  int messageType() {
-    return id;
-  }
+  int messageType() => id;
 }
diff --git a/lib/src/serializers/json.dart b/lib/src/serializers/json.dart
index b7acb31..68f16d9 100644
--- a/lib/src/serializers/json.dart
+++ b/lib/src/serializers/json.dart
@@ -1,21 +1,21 @@
-import 'dart:convert';
-import 'dart:typed_data';
+import "dart:convert";
+import "dart:typed_data";
 
-import 'package:wampproto/src/messages/message.dart';
-import 'package:wampproto/src/serializers/serializer.dart';
+import "package:wampproto/src/messages/message.dart";
+import "package:wampproto/src/serializers/serializer.dart";
 
 class JsonSerializer implements Serializer {
   @override
-  Uint8List serialize(Message message) {
+  Uint8List serialize(final Message message) {
     var jsonString = jsonEncode(message.marshal());
     return Uint8List.fromList(jsonString.codeUnits);
   }
 
   @override
-  Message deserialize(Uint8List message) {
-    String s = String.fromCharCodes(message);
+  Message deserialize(final Uint8List message) {
+    final String s = String.fromCharCodes(message);
 
-    List<dynamic> wampMessage = jsonDecode(s);
+    final List<dynamic> wampMessage = jsonDecode(s);
     return toMessage(wampMessage);
   }
 }
diff --git a/lib/src/serializers/serializer.dart b/lib/src/serializers/serializer.dart
index b04f396..c322535 100644
--- a/lib/src/serializers/serializer.dart
+++ b/lib/src/serializers/serializer.dart
@@ -1,8 +1,8 @@
-import 'dart:typed_data';
+import "dart:typed_data";
 
-import 'package:wampproto/messages.dart';
+import "package:wampproto/messages.dart";
 
-import '../messages/message.dart';
+import "package:wampproto/src/messages/message.dart";
 
 Message toMessage(List<dynamic> message) {
   var messageType = message[0];
@@ -21,6 +21,6 @@ Message toMessage(List<dynamic> message) {
 }
 
 abstract class Serializer {
-  Message deserialize(Uint8List message);
-  Uint8List serialize(Message message);
+  Message deserialize(final Uint8List message);
+  Uint8List serialize(final Message message);
 }
diff --git a/test/messages/hello_test.dart b/test/messages/hello_test.dart
index 1aeff59..c6b0e09 100644
--- a/test/messages/hello_test.dart
+++ b/test/messages/hello_test.dart
@@ -1,5 +1,5 @@
-import 'package:wampproto/messages.dart';
-import 'package:test/test.dart';
+import "package:test/test.dart";
+import "package:wampproto/messages.dart";
 
 void main() {
   test("test parse", testParse);
diff --git a/test/serializers/json_test.dart b/test/serializers/json_test.dart
index d761f93..3a86128 100644
--- a/test/serializers/json_test.dart
+++ b/test/serializers/json_test.dart
@@ -1,6 +1,6 @@
-import 'package:wampproto/messages.dart';
-import 'package:wampproto/serializers.dart';
-import 'package:test/test.dart';
+import "package:test/test.dart";
+import "package:wampproto/messages.dart";
+import "package:wampproto/serializers.dart";
 
 void main() {
   test("test serialize and deserialize", testJson);