diff --git a/api/internal/tests/views/test_owner_viewset.py b/api/internal/tests/views/test_owner_viewset.py
index 144f9d88f7..be80f569c1 100644
--- a/api/internal/tests/views/test_owner_viewset.py
+++ b/api/internal/tests/views/test_owner_viewset.py
@@ -1,6 +1,7 @@
 from unittest.mock import patch
 
 from rest_framework import status
+from rest_framework.exceptions import ErrorDetail
 from rest_framework.reverse import reverse
 from rest_framework.test import APITestCase
 
@@ -50,11 +51,19 @@ def test_retrieve_returns_owner_with_period_username(self):
     def test_retrieve_returns_404_if_no_matching_username(self):
         response = self._retrieve(kwargs={"service": "github", "owner_username": "fff"})
         assert response.status_code == status.HTTP_404_NOT_FOUND
-        assert response.data == {"detail": "Not found."}
+        assert response.data == {
+            "detail": ErrorDetail(
+                string="No Owner matches the given query.", code="not_found"
+            )
+        }
 
     def test_retrieve_owner_unknown_service_returns_404(self):
         response = self._retrieve(
             kwargs={"service": "not-real", "owner_username": "anything"}
         )
         assert response.status_code == status.HTTP_404_NOT_FOUND
-        assert response.data == {"detail": "Service not found: not-real"}
+        assert response.data == {
+            "detail": ErrorDetail(
+                string="Service not found: not-real", code="not_found"
+            )
+        }
diff --git a/api/public/v2/tests/test_api_owner_viewset.py b/api/public/v2/tests/test_api_owner_viewset.py
index 9f0d95b842..a46b8252a6 100644
--- a/api/public/v2/tests/test_api_owner_viewset.py
+++ b/api/public/v2/tests/test_api_owner_viewset.py
@@ -1,4 +1,5 @@
 from rest_framework import status
+from rest_framework.exceptions import ErrorDetail
 from rest_framework.reverse import reverse
 from rest_framework.test import APITestCase
 
@@ -37,7 +38,11 @@ def test_retrieve_returns_owner_with_period_username(self):
     def test_retrieve_returns_404_if_no_matching_username(self):
         response = self._retrieve(kwargs={"service": "github", "owner_username": "fff"})
         assert response.status_code == status.HTTP_404_NOT_FOUND
-        assert response.data == {"detail": "Not found."}
+        assert response.data == {
+            "detail": ErrorDetail(
+                string="No Owner matches the given query.", code="not_found"
+            )
+        }
 
     def test_retrieve_owner_unknown_service_returns_404(self):
         response = self._retrieve(
diff --git a/requirements.in b/requirements.in
index 3e4ae3349f..601ad9b962 100644
--- a/requirements.in
+++ b/requirements.in
@@ -12,7 +12,7 @@ django-filter
 django-model-utils
 django-postgres-extra>=2.0.8
 django-prometheus
-djangorestframework
+djangorestframework==3.15.2
 drf-spectacular
 drf-spectacular-sidecar
 elastic-apm
@@ -54,3 +54,4 @@ vcrpy
 whitenoise
 django-autocomplete-light
 django-better-admin-arrayfield
+certifi>=2024.07.04
diff --git a/requirements.txt b/requirements.txt
index e2ed0d9f45..807c4f1868 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,8 +57,9 @@ cerberus==1.3.2
     # via
     #   -r requirements.in
     #   shared
-certifi==2023.7.22
+certifi==2024.7.4
     # via
+    #   -r requirements.in
     #   elastic-apm
     #   httpcore
     #   httpx
@@ -148,7 +149,7 @@ django-prometheus==2.3.1
     # via
     #   -r requirements.in
     #   shared
-djangorestframework==3.14.0
+djangorestframework==3.15.2
     # via
     #   -r requirements.in
     #   drf-spectacular
@@ -377,7 +378,6 @@ python-redis-lock==4.0.0
 pytz==2022.1
     # via
     #   -r requirements.in
-    #   djangorestframework
     #   shared
 pyyaml==6.0.1
     # via