diff --git a/jsonexample/README.md b/jsonexample/README.md
index 98bddae37..882836c8b 100644
--- a/jsonexample/README.md
+++ b/jsonexample/README.md
@@ -30,6 +30,16 @@ instantiating models and populating their fields.
 Each tab page in the app deserializes one type of data with one library.
 These Widgets show what app code using the above libraries might look like.
 
+## Generating 
+
+The lib/build_value and lib/json_serializable use build_runner to generate
+files. If you make a change to these files, you need to re-run the generator
+using `build_runner`:
+
+```
+flutter pub run build_runner build
+```
+
 ## Questions/issues
 
 If you have a general question about JSON serialization in Flutter, the
diff --git a/jsonexample/analysis_options.yaml b/jsonexample/analysis_options.yaml
index c936d03b1..ea7b50449 100644
--- a/jsonexample/analysis_options.yaml
+++ b/jsonexample/analysis_options.yaml
@@ -1,8 +1,9 @@
-include: package:pedantic/analysis_options.1.7.0.yaml
+include: package:pedantic/analysis_options.1.8.0.yaml
 
 analyzer:
   exclude:
     - lib/json_serializable/*.g.dart
+    - lib/built_value/*.g.dart
   strong-mode:
     implicit-casts: false
     implicit-dynamic: false
diff --git a/jsonexample/build.yaml b/jsonexample/build.yaml
index 26c227479..b74c16ff0 100644
--- a/jsonexample/build.yaml
+++ b/jsonexample/build.yaml
@@ -4,13 +4,6 @@ targets:
       built_value_generator|built_value:
         generate_for:
         - lib/built_value/*.dart
-        options:
-          header: |
-            // Copyright 2018 The Chromium Authors. All rights reserved.
-            // Use of this source code is governed by a BSD-style license that can be
-            // found in the LICENSE file.
-
-            // GENERATED CODE - DO NOT MODIFY BY HAND
       json_serializable|json_serializable:
         generate_for:
         - lib/json_serializable/*.dart
diff --git a/jsonexample/lib/built_value/built_complex_object.g.dart b/jsonexample/lib/built_value/built_complex_object.g.dart
index eedd03061..fc3008116 100644
--- a/jsonexample/lib/built_value/built_complex_object.g.dart
+++ b/jsonexample/lib/built_value/built_complex_object.g.dart
@@ -17,7 +17,7 @@ class _$BuiltComplexObjectSerializer
   final String wireName = 'BuiltComplexObject';
 
   @override
-  Iterable serialize(Serializers serializers, BuiltComplexObject object,
+  Iterable<Object> serialize(Serializers serializers, BuiltComplexObject object,
       {FullType specifiedType = FullType.unspecified}) {
     final result = <Object>[];
     if (object.aString != null) {
@@ -72,12 +72,12 @@ class _$BuiltComplexObjectSerializer
             specifiedType: const FullType(
                 BuiltList, const [const FullType(BuiltSimpleObject)])));
     }
-
     return result;
   }
 
   @override
-  BuiltComplexObject deserialize(Serializers serializers, Iterable serialized,
+  BuiltComplexObject deserialize(
+      Serializers serializers, Iterable<Object> serialized,
       {FullType specifiedType = FullType.unspecified}) {
     final result = new BuiltComplexObjectBuilder();
 
@@ -108,25 +108,25 @@ class _$BuiltComplexObjectSerializer
           result.aListOfStrings.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(String)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
         case 'aListOfInts':
           result.aListOfInts.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(int)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
         case 'aListOfDoubles':
           result.aListOfDoubles.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(double)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
         case 'aListOfObjects':
           result.aListOfObjects.replace(serializers.deserialize(value,
                   specifiedType: const FullType(
                       BuiltList, const [const FullType(BuiltSimpleObject)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
       }
     }
diff --git a/jsonexample/lib/built_value/built_simple_object.g.dart b/jsonexample/lib/built_value/built_simple_object.g.dart
index dd31a3d54..de496a186 100644
--- a/jsonexample/lib/built_value/built_simple_object.g.dart
+++ b/jsonexample/lib/built_value/built_simple_object.g.dart
@@ -17,7 +17,7 @@ class _$BuiltSimpleObjectSerializer
   final String wireName = 'BuiltSimpleObject';
 
   @override
-  Iterable serialize(Serializers serializers, BuiltSimpleObject object,
+  Iterable<Object> serialize(Serializers serializers, BuiltSimpleObject object,
       {FullType specifiedType = FullType.unspecified}) {
     final result = <Object>[];
     if (object.aString != null) {
@@ -59,12 +59,12 @@ class _$BuiltSimpleObjectSerializer
             specifiedType:
                 const FullType(BuiltList, const [const FullType(double)])));
     }
-
     return result;
   }
 
   @override
-  BuiltSimpleObject deserialize(Serializers serializers, Iterable serialized,
+  BuiltSimpleObject deserialize(
+      Serializers serializers, Iterable<Object> serialized,
       {FullType specifiedType = FullType.unspecified}) {
     final result = new BuiltSimpleObjectBuilder();
 
@@ -90,19 +90,19 @@ class _$BuiltSimpleObjectSerializer
           result.aListOfStrings.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(String)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
         case 'aListOfInts':
           result.aListOfInts.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(int)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
         case 'aListOfDoubles':
           result.aListOfDoubles.replace(serializers.deserialize(value,
                   specifiedType:
                       const FullType(BuiltList, const [const FullType(double)]))
-              as BuiltList);
+              as BuiltList<dynamic>);
           break;
       }
     }
diff --git a/jsonexample/lib/json_serializable/serializable_complex_object.g.dart b/jsonexample/lib/json_serializable/serializable_complex_object.g.dart
index 36f7cad63..038d82e36 100644
--- a/jsonexample/lib/json_serializable/serializable_complex_object.g.dart
+++ b/jsonexample/lib/json_serializable/serializable_complex_object.g.dart
@@ -9,25 +9,25 @@ part of 'serializable_complex_object.dart';
 SerializableComplexObject _$SerializableComplexObjectFromJson(
     Map<String, dynamic> json) {
   return SerializableComplexObject(
-      aString: json['aString'] as String,
-      anInt: json['anInt'] as int,
-      aDouble: (json['aDouble'] as num)?.toDouble(),
-      anObject: json['anObject'] == null
-          ? null
-          : SerializableSimpleObject.fromJson(
-              json['anObject'] as Map<String, dynamic>),
-      aListOfStrings:
-          (json['aListOfStrings'] as List)?.map((e) => e as String)?.toList(),
-      aListOfInts:
-          (json['aListOfInts'] as List)?.map((e) => e as int)?.toList(),
-      aListOfDoubles: (json['aListOfDoubles'] as List)
-          ?.map((e) => (e as num)?.toDouble())
-          ?.toList(),
-      aListOfObjects: (json['aListOfObjects'] as List)
-          ?.map((e) => e == null
-              ? null
-              : SerializableSimpleObject.fromJson(e as Map<String, dynamic>))
-          ?.toList());
+    aString: json['aString'] as String,
+    anInt: json['anInt'] as int,
+    aDouble: (json['aDouble'] as num)?.toDouble(),
+    anObject: json['anObject'] == null
+        ? null
+        : SerializableSimpleObject.fromJson(
+            json['anObject'] as Map<String, dynamic>),
+    aListOfStrings:
+        (json['aListOfStrings'] as List)?.map((e) => e as String)?.toList(),
+    aListOfInts: (json['aListOfInts'] as List)?.map((e) => e as int)?.toList(),
+    aListOfDoubles: (json['aListOfDoubles'] as List)
+        ?.map((e) => (e as num)?.toDouble())
+        ?.toList(),
+    aListOfObjects: (json['aListOfObjects'] as List)
+        ?.map((e) => e == null
+            ? null
+            : SerializableSimpleObject.fromJson(e as Map<String, dynamic>))
+        ?.toList(),
+  );
 }
 
 Map<String, dynamic> _$SerializableComplexObjectToJson(
@@ -40,5 +40,5 @@ Map<String, dynamic> _$SerializableComplexObjectToJson(
       'aListOfStrings': instance.aListOfStrings,
       'aListOfInts': instance.aListOfInts,
       'aListOfDoubles': instance.aListOfDoubles,
-      'aListOfObjects': instance.aListOfObjects
+      'aListOfObjects': instance.aListOfObjects,
     };
diff --git a/jsonexample/lib/json_serializable/serializable_simple_object.g.dart b/jsonexample/lib/json_serializable/serializable_simple_object.g.dart
index a27b60850..3d86dac92 100644
--- a/jsonexample/lib/json_serializable/serializable_simple_object.g.dart
+++ b/jsonexample/lib/json_serializable/serializable_simple_object.g.dart
@@ -9,16 +9,16 @@ part of 'serializable_simple_object.dart';
 SerializableSimpleObject _$SerializableSimpleObjectFromJson(
     Map<String, dynamic> json) {
   return SerializableSimpleObject(
-      aString: json['aString'] as String,
-      anInt: json['anInt'] as int,
-      aDouble: (json['aDouble'] as num)?.toDouble(),
-      aListOfStrings:
-          (json['aListOfStrings'] as List)?.map((e) => e as String)?.toList(),
-      aListOfInts:
-          (json['aListOfInts'] as List)?.map((e) => e as int)?.toList(),
-      aListOfDoubles: (json['aListOfDoubles'] as List)
-          ?.map((e) => (e as num)?.toDouble())
-          ?.toList());
+    aString: json['aString'] as String,
+    anInt: json['anInt'] as int,
+    aDouble: (json['aDouble'] as num)?.toDouble(),
+    aListOfStrings:
+        (json['aListOfStrings'] as List)?.map((e) => e as String)?.toList(),
+    aListOfInts: (json['aListOfInts'] as List)?.map((e) => e as int)?.toList(),
+    aListOfDoubles: (json['aListOfDoubles'] as List)
+        ?.map((e) => (e as num)?.toDouble())
+        ?.toList(),
+  );
 }
 
 Map<String, dynamic> _$SerializableSimpleObjectToJson(
@@ -29,5 +29,5 @@ Map<String, dynamic> _$SerializableSimpleObjectToJson(
       'aDouble': instance.aDouble,
       'aListOfStrings': instance.aListOfStrings,
       'aListOfInts': instance.aListOfInts,
-      'aListOfDoubles': instance.aListOfDoubles
+      'aListOfDoubles': instance.aListOfDoubles,
     };
diff --git a/jsonexample/pubspec.lock b/jsonexample/pubspec.lock
index 85d510b0a..fc281a78a 100644
--- a/jsonexample/pubspec.lock
+++ b/jsonexample/pubspec.lock
@@ -42,7 +42,7 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.2.0"
   build_config:
     dependency: transitive
     description:
@@ -56,28 +56,28 @@ packages:
       name: build_daemon
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   build_resolvers:
     dependency: transitive
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.1.1"
   build_runner:
     dependency: "direct dev"
     description:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.8"
+    version: "1.7.1"
   build_runner_core:
     dependency: transitive
     description:
       name: build_runner_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.0"
+    version: "4.1.0"
   built_collection:
     dependency: "direct main"
     description:
@@ -140,7 +140,7 @@ packages:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.3"
   csslib:
     dependency: transitive
     description:
@@ -199,7 +199,7 @@ packages:
       name: html
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.14.0+2"
+    version: "0.14.0+3"
   http:
     dependency: transitive
     description:
@@ -456,6 +456,6 @@ packages:
       name: yaml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.16"
+    version: "2.2.0"
 sdks:
   dart: ">=2.5.0 <3.0.0"
diff --git a/jsonexample/pubspec.yaml b/jsonexample/pubspec.yaml
index c8d613018..630a5cac3 100644
--- a/jsonexample/pubspec.yaml
+++ b/jsonexample/pubspec.yaml
@@ -13,7 +13,7 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  build_runner: ^1.6.8
+  build_runner: ^1.7.1
   built_value_generator: ^6.7.1
   json_serializable: ^3.2.2
   pedantic: ^1.8.0+1
@@ -23,4 +23,3 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
-