diff --git a/castellum/subjects/migrations/0033_subject_updated_at.py b/castellum/subjects/migrations/0033_subject_updated_at.py
new file mode 100644
index 0000000000000000000000000000000000000000..179a9ae09aa30e01a92e4baaadb863a88038e92e
--- /dev/null
+++ b/castellum/subjects/migrations/0033_subject_updated_at.py
@@ -0,0 +1,51 @@
+from django.db import migrations, models
+
+
+def migrate_data(apps, schema_editor):
+    Subject = apps.get_model('subjects', 'Subject')
+    Contact = apps.get_model('contacts', 'Contact')
+
+    # re-implementation of constants from model Participation
+    UNSUITABLE = 2
+    INVITED = 3
+    FOLLOWUP_APPOINTED = 4
+
+    subjects = Subject.objects.filter(
+        deceased=False, blocked=False
+    ).annotate(
+        participation_updated_at=models.Max(
+            'participation__updated_at',
+            filter=models.Q(
+                participation__status__in=[INVITED, UNSUITABLE, FOLLOWUP_APPOINTED],
+                participation__excluded_by_cleanup=False,
+            )
+        )
+    )
+
+    for subject in subjects:
+        contact = Contact.objects.filter(subject_uuid=subject.pk).first()
+        if contact:
+            contact_updated_at = contact.updated_at
+        else:
+            contact_updated_at = None
+
+        dates = [subject.updated_at, contact_updated_at, subject.participation_updated_at.date()]
+        most_recent_contact = max(date for date in dates if date)
+
+        if most_recent_contact != subject.updated_at:
+            # needs to be update() in order not to set Subject.updated_at to now
+            Subject.objects.filter(uuid=subject.uuid).update(updated_at=most_recent_contact)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('subjects', '0032_subject_uuid_foreign_key'),
+
+        # this dependency is ineffective because it is about the other database
+        ('contacts', '0015_contactcreationrequest_message'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_data),
+    ]
diff --git a/tests/subjects/migrations/test_0033_subject_updated_at.py b/tests/subjects/migrations/test_0033_subject_updated_at.py
new file mode 100644
index 0000000000000000000000000000000000000000..f269b0cd88ab4bdb8e21a62eb08723e496270b65
--- /dev/null
+++ b/tests/subjects/migrations/test_0033_subject_updated_at.py
@@ -0,0 +1,29 @@
+import pytest
+from model_bakery import baker
+from freezegun import freeze_time
+from tests.markers import skip_old_migration
+
+
+@pytest.mark.django_db(databases=['default', 'contacts'])
+@skip_old_migration('0.70')
+def test_keep_uuid(migrator):
+    old_state = migrator.apply_initial_migration(('subjects', '0032_subject_uuid_foreign_key'))
+    Subject = old_state.apps.get_model('subjects', 'Subject')
+    Study = old_state.apps.get_model('studies', 'Study')
+    Participation = old_state.apps.get_model('recruitment', 'Participation')
+    # re-implementation of constant from model Participation
+    INVITED = 3
+
+    with freeze_time("1970-01-01 12:00"):
+        subject = baker.make(Subject)
+        study = baker.make(Study)
+    with freeze_time("2000-01-01 12:00"):
+        participation = baker.make(Participation, subject=subject, study=study, status=INVITED)
+
+    new_state = migrator.apply_tested_migration(('subjects', '0033_subject_updated_at'))
+    Subject = new_state.apps.get_model('subjects', 'Subject')
+    subject = Subject.objects.first()
+
+    assert subject.updated_at == participation.updated_at.date()
+
+    migrator.reset()