diff --git a/packages/cloud_firestore/CHANGELOG.md b/packages/cloud_firestore/CHANGELOG.md
index 09a5cd81433b..9229b38d8f8d 100644
--- a/packages/cloud_firestore/CHANGELOG.md
+++ b/packages/cloud_firestore/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.9.7+2
+
+* Bump the minimum Flutter version to 1.2.0.
+* Add template type parameter to `invokeMethod` calls.
+
 ## 0.9.7+1
 
 * Update README with example of getting a document.
diff --git a/packages/cloud_firestore/lib/src/document_reference.dart b/packages/cloud_firestore/lib/src/document_reference.dart
index 62f95252af7d..7f103d3fd769 100644
--- a/packages/cloud_firestore/lib/src/document_reference.dart
+++ b/packages/cloud_firestore/lib/src/document_reference.dart
@@ -40,10 +40,7 @@ class DocumentReference {
   /// If [merge] is true, the provided data will be merged into an
   /// existing document instead of overwriting.
   Future<void> setData(Map<String, dynamic> data, {bool merge = false}) {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    return Firestore.channel.invokeMethod(
+    return Firestore.channel.invokeMethod<void>(
       'DocumentReference#setData',
       <String, dynamic>{
         'app': firestore.app.name,
@@ -61,10 +58,7 @@ class DocumentReference {
   ///
   /// If no document exists yet, the update will fail.
   Future<void> updateData(Map<String, dynamic> data) {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    return Firestore.channel.invokeMethod(
+    return Firestore.channel.invokeMethod<void>(
       'DocumentReference#updateData',
       <String, dynamic>{
         'app': firestore.app.name,
@@ -78,10 +72,8 @@ class DocumentReference {
   ///
   /// If no document exists, the read will return null.
   Future<DocumentSnapshot> get() async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    final Map<dynamic, dynamic> data = await Firestore.channel.invokeMethod(
+    final Map<String, dynamic> data =
+        await Firestore.channel.invokeMapMethod<String, dynamic>(
       'DocumentReference#get',
       <String, dynamic>{'app': firestore.app.name, 'path': path},
     );
@@ -94,10 +86,7 @@ class DocumentReference {
 
   /// Deletes the document referred to by this [DocumentReference].
   Future<void> delete() {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    return Firestore.channel.invokeMethod(
+    return Firestore.channel.invokeMethod<void>(
       'DocumentReference#delete',
       <String, dynamic>{'app': firestore.app.name, 'path': path},
     );
@@ -120,10 +109,7 @@ class DocumentReference {
     StreamController<DocumentSnapshot> controller; // ignore: close_sinks
     controller = StreamController<DocumentSnapshot>.broadcast(
       onListen: () {
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        _handle = Firestore.channel.invokeMethod(
+        _handle = Firestore.channel.invokeMethod<int>(
           'Query#addDocumentListener',
           <String, dynamic>{
             'app': firestore.app.name,
@@ -136,10 +122,7 @@ class DocumentReference {
       },
       onCancel: () {
         _handle.then((int handle) async {
-          // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-          // https://github.com/flutter/flutter/issues/26431
-          // ignore: strong_mode_implicit_dynamic_method
-          await Firestore.channel.invokeMethod(
+          await Firestore.channel.invokeMethod<void>(
             'Query#removeListener',
             <String, dynamic>{'handle': handle},
           );
diff --git a/packages/cloud_firestore/lib/src/firestore.dart b/packages/cloud_firestore/lib/src/firestore.dart
index 42639d140bfe..27c90ff599e8 100644
--- a/packages/cloud_firestore/lib/src/firestore.dart
+++ b/packages/cloud_firestore/lib/src/firestore.dart
@@ -110,25 +110,21 @@ class Firestore {
         'Transaction timeout must be more than 0 milliseconds');
     final int transactionId = _transactionHandlerId++;
     _transactionHandlers[transactionId] = transactionHandler;
-    final Map<dynamic, dynamic> result = await channel
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        .invokeMethod('Firestore#runTransaction', <String, dynamic>{
+    final Map<String, dynamic> result = await channel
+        .invokeMapMethod<String, dynamic>(
+            'Firestore#runTransaction', <String, dynamic>{
       'app': app.name,
       'transactionId': transactionId,
       'transactionTimeout': timeout.inMilliseconds
     });
-    return result?.cast<String, dynamic>() ?? <String, dynamic>{};
+    return result ?? <String, dynamic>{};
   }
 
   @deprecated
   Future<void> enablePersistence(bool enable) async {
     assert(enable != null);
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod('Firestore#enablePersistence', <String, dynamic>{
+    await channel
+        .invokeMethod<void>('Firestore#enablePersistence', <String, dynamic>{
       'app': app.name,
       'enable': enable,
     });
@@ -139,10 +135,7 @@ class Firestore {
       String host,
       bool sslEnabled,
       bool timestampsInSnapshotsEnabled}) async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    await channel.invokeMethod('Firestore#settings', <String, dynamic>{
+    await channel.invokeMethod<void>('Firestore#settings', <String, dynamic>{
       'app': app.name,
       'persistenceEnabled': persistenceEnabled,
       'host': host,
diff --git a/packages/cloud_firestore/lib/src/query.dart b/packages/cloud_firestore/lib/src/query.dart
index a23809852a86..dc35082a87fc 100644
--- a/packages/cloud_firestore/lib/src/query.dart
+++ b/packages/cloud_firestore/lib/src/query.dart
@@ -53,10 +53,7 @@ class Query {
     StreamController<QuerySnapshot> controller; // ignore: close_sinks
     controller = StreamController<QuerySnapshot>.broadcast(
       onListen: () {
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        _handle = Firestore.channel.invokeMethod(
+        _handle = Firestore.channel.invokeMethod<int>(
           'Query#addSnapshotListener',
           <String, dynamic>{
             'app': firestore.app.name,
@@ -70,10 +67,7 @@ class Query {
       },
       onCancel: () {
         _handle.then((int handle) async {
-          // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-          // https://github.com/flutter/flutter/issues/26431
-          // ignore: strong_mode_implicit_dynamic_method
-          await Firestore.channel.invokeMethod(
+          await Firestore.channel.invokeMethod<void>(
             'Query#removeListener',
             <String, dynamic>{'handle': handle},
           );
@@ -86,10 +80,8 @@ class Query {
 
   /// Fetch the documents for this query
   Future<QuerySnapshot> getDocuments() async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    final Map<dynamic, dynamic> data = await Firestore.channel.invokeMethod(
+    final Map<String, dynamic> data =
+        await Firestore.channel.invokeMapMethod<String, dynamic>(
       'Query#getDocuments',
       <String, dynamic>{
         'app': firestore.app.name,
diff --git a/packages/cloud_firestore/lib/src/transaction.dart b/packages/cloud_firestore/lib/src/transaction.dart
index 734c942f53fe..f6f80c6b2d71 100644
--- a/packages/cloud_firestore/lib/src/transaction.dart
+++ b/packages/cloud_firestore/lib/src/transaction.dart
@@ -14,11 +14,8 @@ class Transaction {
   Firestore _firestore;
 
   Future<DocumentSnapshot> get(DocumentReference documentReference) async {
-    final dynamic result = await Firestore.channel
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        .invokeMethod('Transaction#get', <String, dynamic>{
+    final Map<String, dynamic> result = await Firestore.channel
+        .invokeMapMethod<String, dynamic>('Transaction#get', <String, dynamic>{
       'app': _firestore.app.name,
       'transactionId': _transactionId,
       'path': documentReference.path,
@@ -33,10 +30,7 @@ class Transaction {
 
   Future<void> delete(DocumentReference documentReference) async {
     return Firestore.channel
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        .invokeMethod('Transaction#delete', <String, dynamic>{
+        .invokeMethod<void>('Transaction#delete', <String, dynamic>{
       'app': _firestore.app.name,
       'transactionId': _transactionId,
       'path': documentReference.path,
@@ -46,10 +40,7 @@ class Transaction {
   Future<void> update(
       DocumentReference documentReference, Map<String, dynamic> data) async {
     return Firestore.channel
-        // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-        // https://github.com/flutter/flutter/issues/26431
-        // ignore: strong_mode_implicit_dynamic_method
-        .invokeMethod('Transaction#update', <String, dynamic>{
+        .invokeMethod<void>('Transaction#update', <String, dynamic>{
       'app': _firestore.app.name,
       'transactionId': _transactionId,
       'path': documentReference.path,
@@ -59,10 +50,8 @@ class Transaction {
 
   Future<void> set(
       DocumentReference documentReference, Map<String, dynamic> data) async {
-    // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-    // https://github.com/flutter/flutter/issues/26431
-    // ignore: strong_mode_implicit_dynamic_method
-    return Firestore.channel.invokeMethod('Transaction#set', <String, dynamic>{
+    return Firestore.channel
+        .invokeMethod<void>('Transaction#set', <String, dynamic>{
       'app': _firestore.app.name,
       'transactionId': _transactionId,
       'path': documentReference.path,
diff --git a/packages/cloud_firestore/lib/src/write_batch.dart b/packages/cloud_firestore/lib/src/write_batch.dart
index cfa5e5253357..6a41ee7bfec3 100644
--- a/packages/cloud_firestore/lib/src/write_batch.dart
+++ b/packages/cloud_firestore/lib/src/write_batch.dart
@@ -12,10 +12,7 @@ part of cloud_firestore;
 /// nor can it be committed again.
 class WriteBatch {
   WriteBatch._(this._firestore)
-      // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-      // https://github.com/flutter/flutter/issues/26431
-      // ignore: strong_mode_implicit_dynamic_method
-      : _handle = Firestore.channel.invokeMethod(
+      : _handle = Firestore.channel.invokeMethod<dynamic>(
             'WriteBatch#create', <String, dynamic>{'app': _firestore.app.name});
 
   final Firestore _firestore;
@@ -32,10 +29,7 @@ class WriteBatch {
     if (!_committed) {
       _committed = true;
       await Future.wait<dynamic>(_actions);
-      // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-      // https://github.com/flutter/flutter/issues/26431
-      // ignore: strong_mode_implicit_dynamic_method
-      await Firestore.channel.invokeMethod(
+      await Firestore.channel.invokeMethod<void>(
           'WriteBatch#commit', <String, dynamic>{'handle': await _handle});
     } else {
       throw StateError("This batch has already been committed.");
@@ -47,10 +41,7 @@ class WriteBatch {
     if (!_committed) {
       _handle.then((dynamic handle) {
         _actions.add(
-          // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-          // https://github.com/flutter/flutter/issues/26431
-          // ignore: strong_mode_implicit_dynamic_method
-          Firestore.channel.invokeMethod(
+          Firestore.channel.invokeMethod<void>(
             'WriteBatch#delete',
             <String, dynamic>{
               'app': _firestore.app.name,
@@ -77,10 +68,7 @@ class WriteBatch {
     if (!_committed) {
       _handle.then((dynamic handle) {
         _actions.add(
-          // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-          // https://github.com/flutter/flutter/issues/26431
-          // ignore: strong_mode_implicit_dynamic_method
-          Firestore.channel.invokeMethod(
+          Firestore.channel.invokeMethod<void>(
             'WriteBatch#setData',
             <String, dynamic>{
               'app': _firestore.app.name,
@@ -105,10 +93,7 @@ class WriteBatch {
     if (!_committed) {
       _handle.then((dynamic handle) {
         _actions.add(
-          // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-          // https://github.com/flutter/flutter/issues/26431
-          // ignore: strong_mode_implicit_dynamic_method
-          Firestore.channel.invokeMethod(
+          Firestore.channel.invokeMethod<void>(
             'WriteBatch#updateData',
             <String, dynamic>{
               'app': _firestore.app.name,
diff --git a/packages/cloud_firestore/pubspec.yaml b/packages/cloud_firestore/pubspec.yaml
index 1e3c4d6a00b4..1781a59dddb3 100755
--- a/packages/cloud_firestore/pubspec.yaml
+++ b/packages/cloud_firestore/pubspec.yaml
@@ -3,7 +3,7 @@ description: Flutter plugin for Cloud Firestore, a cloud-hosted, noSQL database
   live synchronization and offline support on Android and iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/cloud_firestore
-version: 0.9.7+1
+version: 0.9.7+2
 
 flutter:
   plugin:
@@ -27,4 +27,4 @@ dev_dependencies:
 
 environment:
   sdk: ">=2.0.0-dev.28.0 <3.0.0"
-  flutter: ">=0.2.4 <2.0.0"
+  flutter: ">=1.2.0 <2.0.0"