diff --git a/backend/dataset/migrations/0046_merge_20240403_1156.py b/backend/dataset/migrations/0046_merge_20240403_1156.py
new file mode 100644
index 000000000..db21599f4
--- /dev/null
+++ b/backend/dataset/migrations/0046_merge_20240403_1156.py
@@ -0,0 +1,12 @@
+# Generated by Django 3.2.23 on 2024-04-03 11:56
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("dataset", "0045_alter_ocrdocument_ocr_domain"),
+        ("dataset", "0045_auto_20240321_0949"),
+    ]
+
+    operations = []
diff --git a/backend/tasks/migrations/0049_annotation_version_updated_at.py b/backend/tasks/migrations/0049_annotation_version_updated_at.py
new file mode 100644
index 000000000..d5a680b7e
--- /dev/null
+++ b/backend/tasks/migrations/0049_annotation_version_updated_at.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.2.23 on 2024-04-16 09:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("tasks", "0048_alter_annotation_unique_together"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="annotation",
+            name="version_updated_at",
+            field=models.DateTimeField(
+                default="2000-01-01T00:00:00Z",
+                verbose_name="annotation_version_updated_at",
+            ),
+        ),
+    ]
diff --git a/backend/tasks/models.py b/backend/tasks/models.py
index 7fac09c7a..fcd8437b9 100644
--- a/backend/tasks/models.py
+++ b/backend/tasks/models.py
@@ -232,6 +232,10 @@ class Annotation(models.Model):
     updated_at = models.DateTimeField(
         auto_now=True, verbose_name="annotation_updated_at"
     )
+    version_updated_at = models.DateTimeField(
+        default="2000-01-01T00:00:00Z",
+        verbose_name="annotation_version_updated_at",
+    )
     lead_time = models.FloatField(default=0.0, verbose_name="annotation_lead_time")
     parent_annotation = models.ForeignKey(
         "self",
diff --git a/backend/tasks/views.py b/backend/tasks/views.py
index 43517ac06..1e613dc5c 100644
--- a/backend/tasks/views.py
+++ b/backend/tasks/views.py
@@ -1776,6 +1776,26 @@ def partial_update(self, request, pk=None):
             self.populate_task_data_language_and_domain(
                 annotation_obj.task, language, ocr_domain
             )
+
+        if "last_updated_at" in request.data:
+            try:
+                dt_object = datetime.strptime(
+                    request.data["last_updated_at"], "%Y-%m-%dT%H:%M:%S.%fZ"
+                )
+                output_datetime = dt_object.strftime("%Y-%m-%d %H:%M:%S.%f+00:00")
+            except:
+                dt_object = datetime.strptime(
+                    request.data["last_updated_at"], "%Y-%m-%dT%H:%M:%SZ"
+                )
+                output_datetime = dt_object.strftime("%Y-%m-%d %H:%M:%S+00:00")
+            if str(output_datetime) != str(annotation_obj.version_updated_at):
+                return Response(
+                    {
+                        "message": "Annotation got updated, please refresh and try again."
+                    },
+                    status=status.HTTP_400_BAD_REQUEST,
+                )
+
         # Base annotation update
         if annotation_obj.annotation_type == ANNOTATOR_ANNOTATION:
             if request.user not in task.annotation_users.all():
@@ -1785,7 +1805,16 @@ def partial_update(self, request, pk=None):
             # need to add few filters here
 
             if auto_save:
-                update_fields_list = ["result", "lead_time", "updated_at"]
+                update_fields_list = [
+                    "result",
+                    "lead_time",
+                    "updated_at",
+                    "version_updated_at",
+                ]
+                annotation_obj.version_updated_at = (
+                    request.data["version_updated_at"]
+                    or annotation_obj.version_updated_at
+                )
                 if "cl_format" in request.query_params:
                     (
                         annotation_obj.result,
@@ -1914,7 +1943,16 @@ def partial_update(self, request, pk=None):
                 return Response(ret_dict, status=ret_status)
 
             if auto_save:
-                update_fields_list = ["result", "lead_time", "updated_at"]
+                update_fields_list = [
+                    "result",
+                    "lead_time",
+                    "updated_at",
+                    "version_updated_at",
+                ]
+                annotation_obj.version_updated_at = (
+                    request.data["version_updated_at"]
+                    or annotation_obj.version_updated_at
+                )
                 if "cl_format" in request.query_params:
                     (
                         annotation_obj.result,
@@ -2109,7 +2147,16 @@ def partial_update(self, request, pk=None):
                 return Response(ret_dict, status=ret_status)
 
             if auto_save:
-                update_fields_list = ["result", "lead_time", "updated_at"]
+                update_fields_list = [
+                    "result",
+                    "lead_time",
+                    "updated_at",
+                    "version_updated_at",
+                ]
+                annotation_obj.version_updated_at = (
+                    request.data["version_updated_at"]
+                    or annotation_obj.version_updated_at
+                )
                 if "cl_format" in request.query_params:
                     (
                         annotation_obj.result,