diff --git a/lib/src/app/app.dart b/lib/src/app/app.dart
index 4e8d5cce71e..01fd3ed4a48 100644
--- a/lib/src/app/app.dart
+++ b/lib/src/app/app.dart
@@ -3,6 +3,7 @@ import 'dart:async';
 import '../../protos/app/packages.dart';
 import '../gen/app/v1/app.pbgrpc.dart';
 import '../gen/common/v1/common.pb.dart';
+import '../gen/google/protobuf/timestamp.pb.dart';
 import '../utils.dart';
 import 'permissions.dart';
 
@@ -363,11 +364,12 @@ class AppClient {
   /// Update a specific [RobotPart] by ID
   ///
   /// For more information, see [Fleet Management API](https://docs.viam.com/appendix/apis/fleet/).
-  Future<RobotPart> updateRobotPart(String partId, String name, Map<String, dynamic> robotConfig) async {
+  Future<RobotPart> updateRobotPart(String partId, String name, Map<String, dynamic> robotConfig, {DateTime? lastKnownUpdate}) async {
     final updateRobotPartRequest = UpdateRobotPartRequest()
       ..id = partId
       ..name = name
       ..robotConfig = robotConfig.toStruct();
+    if (lastKnownUpdate != null) updateRobotPartRequest.lastKnownUpdate = Timestamp.fromDateTime(lastKnownUpdate);
     final response = await _client.updateRobotPart(updateRobotPartRequest);
     return response.part;
   }
@@ -513,13 +515,14 @@ class AppClient {
   ///
   /// For more information, see [Fleet Management API](https://docs.viam.com/appendix/apis/fleet/).
   Future<Fragment> updateFragment(String id, String name, Map<String, dynamic> config,
-      {bool? public, FragmentVisibility? visibility}) async {
+      {bool? public, FragmentVisibility? visibility, DateTime? lastKnownUpdate}) async {
     final request = UpdateFragmentRequest()
       ..id = id
       ..name = name
       ..config = config.toStruct();
     if (public != null) request.public = public;
     if (visibility != null) request.visibility = visibility;
+    if (lastKnownUpdate != null) request.lastKnownUpdate = Timestamp.fromDateTime(lastKnownUpdate);
     final UpdateFragmentResponse response = await _client.updateFragment(request);
     return response.fragment;
   }
diff --git a/test/unit_test/app/app_client_test.dart b/test/unit_test/app/app_client_test.dart
index cc06da9034c..25479ca124f 100644
--- a/test/unit_test/app/app_client_test.dart
+++ b/test/unit_test/app/app_client_test.dart
@@ -385,7 +385,7 @@ void main() {
         ..name = 'name2';
       when(serviceClient.updateRobotPart(any)).thenAnswer((_) => MockResponseFuture.value(UpdateRobotPartResponse()..part = expected));
       final rc = {'robot': 'config'};
-      final response = await appClient.updateRobotPart('robot part', 'name2', rc);
+      final response = await appClient.updateRobotPart('robot part', 'name2', rc, lastKnownUpdate: DateTime.now());
       expect(response, equals(expected));
     });
 
@@ -547,7 +547,7 @@ void main() {
         ..organizationCount = 2
         ..onlyUsedByOwner = false;
       when(serviceClient.updateFragment(any)).thenAnswer((_) => MockResponseFuture.value(UpdateFragmentResponse()..fragment = expected));
-      final response = await appClient.updateFragment('id', 'name', {'config': 2}, public: false);
+      final response = await appClient.updateFragment('id', 'name', {'config': 2}, public: false, lastKnownUpdate: DateTime.now());
       expect(response, equals(expected));
     });