diff --git a/src/documents/tests/test_api_document_versions.py b/src/documents/tests/test_api_document_versions.py
index 29665bcfe..dabbe97f8 100644
--- a/src/documents/tests/test_api_document_versions.py
+++ b/src/documents/tests/test_api_document_versions.py
@@ -5,9 +5,11 @@ from unittest import mock
 from auditlog.models import LogEntry  # type: ignore[import-untyped]
 from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
+from django.core.files.uploadedfile import SimpleUploadedFile
 from rest_framework import status
 from rest_framework.test import APITestCase
 
+from documents.data_models import DocumentSource
 from documents.models import Document
 from documents.tests.utils import DirectoriesMixin
 
@@ -19,6 +21,13 @@ class TestDocumentVersioningApi(DirectoriesMixin, APITestCase):
         self.user = User.objects.create_superuser(username="temp_admin")
         self.client.force_authenticate(user=self.user)
 
+    def _make_pdf_upload(self, name: str = "version.pdf") -> SimpleUploadedFile:
+        return SimpleUploadedFile(
+            name,
+            b"%PDF-1.4\n1 0 obj\n<<>>\nendobj\n%%EOF",
+            content_type="application/pdf",
+        )
+
     def test_root_endpoint_returns_root_for_version_and_root(self) -> None:
         root = Document.objects.create(
             title="root",
@@ -153,3 +162,96 @@ class TestDocumentVersioningApi(DirectoriesMixin, APITestCase):
             )
 
         self.assertEqual(resp.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_delete_version_accepts_version_id_as_root_parameter(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        version = Document.objects.create(
+            title="v1",
+            checksum="v1",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(
+                f"/api/documents/{version.id}/versions/{version.id}/",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertFalse(Document.objects.filter(id=version.id).exists())
+        self.assertEqual(resp.data["current_version_id"], root.id)
+
+    def test_update_version_enqueues_consume_with_overrides(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        upload = self._make_pdf_upload()
+
+        async_task = mock.Mock()
+        async_task.id = "task-123"
+
+        with mock.patch("documents.views.consume_file") as consume_mock:
+            consume_mock.delay.return_value = async_task
+            resp = self.client.post(
+                f"/api/documents/{root.id}/update_version/",
+                {"document": upload, "version_label": "  New Version  "},
+                format="multipart",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertEqual(resp.data, "task-123")
+        consume_mock.delay.assert_called_once()
+        input_doc, overrides = consume_mock.delay.call_args[0]
+        self.assertEqual(input_doc.root_document_id, root.id)
+        self.assertEqual(input_doc.source, DocumentSource.ApiUpload)
+        self.assertEqual(overrides.version_label, "New Version")
+        self.assertEqual(overrides.actor_id, self.user.id)
+
+    def test_update_version_returns_403_without_permission(self) -> None:
+        owner = User.objects.create_user(username="owner")
+        other = User.objects.create_user(username="other")
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+            owner=owner,
+        )
+        self.client.force_authenticate(user=other)
+
+        resp = self.client.post(
+            f"/api/documents/{root.id}/update_version/",
+            {"document": self._make_pdf_upload()},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_403_FORBIDDEN)
+
+    def test_update_version_returns_404_for_missing_document(self) -> None:
+        resp = self.client.post(
+            "/api/documents/9999/update_version/",
+            {"document": self._make_pdf_upload()},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_update_version_requires_document(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+
+        resp = self.client.post(
+            f"/api/documents/{root.id}/update_version/",
+            {"version_label": "label"},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)