diff --git a/CHANGELOG.md b/CHANGELOG.md
index d39afae9..a829ef8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 
 ## Pre-release
+- no ticket - Handle non-serializable page requested via /api/pages/<pk>/
+- no ticket - Upgrade bleach to fix vulnerability
 
 ## [2020.03.06](https://github.com/uktrade/directory-cms/releases/tag/2020.03.06)
 [Full Changelog](https://github.com/uktrade/directory-cms/compare/2020.03.04...2020.03.06)
diff --git a/core/views.py b/core/views.py
index d2b0fcf8..b02faa21 100644
--- a/core/views.py
+++ b/core/views.py
@@ -22,6 +22,10 @@
 from core.serializer_mapping import MODELS_SERIALIZERS_MAPPING
 
 
+class PageNotSerializableError(NotImplementedError):
+    pass
+
+
 class APIEndpointBase(PagesAdminAPIEndpoint):
     """At the very deep core this is a DRF GenericViewSet, with a few wagtail
     layers on top.
@@ -124,6 +128,18 @@ def listing_view(self, request):
     def object_id(self):
         return self.kwargs['pk']
 
+    def get_serializer_class(self):
+        model_class = self.get_model_class()
+        if model_class not in MODELS_SERIALIZERS_MAPPING:
+            raise PageNotSerializableError(model_class.__name__)
+        return super().get_serializer_class()
+
+    def handle_exception(self, exc):
+        if isinstance(exc, PageNotSerializableError):
+            # page that exists has been requested, but it's not serializable. E.g, it's a folder page
+            return Response(status=204)
+        return super().handle_exception(exc)
+
 
 class DetailViewEndpointBase(APIEndpointBase):
     detail_only_fields = ['id']
diff --git a/requirements.in b/requirements.in
index 2710f9be..8a37d141 100644
--- a/requirements.in
+++ b/requirements.in
@@ -26,7 +26,7 @@ django-celery-beat==2.0.0
 kombu==4.6.6
 requests==2.21.0
 markdown==2.6
-bleach==3.0.2
+bleach==3.1.1
 bleach-whitelist==0.0.9
 wagtail-modeltranslation==0.10.2
 urllib3>=1.24.2<2.0.0
diff --git a/requirements.txt b/requirements.txt
index e0bbca07..f5ed2c6b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,82 +8,82 @@ amqp==2.5.2               # via kombu
 attrs==19.3.0             # via jsonschema
 beautifulsoup4==4.6.0     # via directory-components, wagtail
 billiard==3.6.1.0         # via celery
-bleach-whitelist==0.0.9
-bleach==3.0.2
-boto3==1.6.3
+bleach-whitelist==0.0.9   # via -r requirements.in
+bleach==3.1.1             # via -r requirements.in
+boto3==1.6.3              # via -r requirements.in
 botocore==1.9.23          # via boto3, s3transfer
-celery[redis]==4.3.0
+celery[redis]==4.3.0      # via -r requirements.in, django-celery-beat
 certifi==2019.11.28       # via requests, sentry-sdk
 chardet==3.0.4            # via requests
-directory-components==20.0.0
-directory-constants==18.6.0
-directory-healthcheck==1.1.1
-dj-database-url==0.5.0
-django-admin-ip-restrictor==2.1.0
-django-celery-beat==2.0.0
-django-environ==0.4.5
-django-filter==2.2.0
+directory-components==20.0.0  # via -r requirements.in
+directory-constants==18.6.0  # via -r requirements.in, directory-components
+directory-healthcheck==1.1.1  # via -r requirements.in
+dj-database-url==0.5.0    # via -r requirements.in
+django-admin-ip-restrictor==2.1.0  # via -r requirements.in
+django-celery-beat==2.0.0  # via -r requirements.in
+django-environ==0.4.5     # via -r requirements.in
+django-filter==2.2.0      # via -r requirements.in
 django-health-check==3.8.0  # via directory-healthcheck
 django-ipware==2.1.0      # via django-admin-ip-restrictor
 django-modelcluster==4.4  # via wagtail
 django-modeltranslation==0.14  # via wagtail-modeltranslation
-django-pglocks==1.0.2
-django-redis==4.10.0
-django-staff-sso-client==1.0.0
+django-pglocks==1.0.2     # via -r requirements.in
+django-redis==4.10.0      # via -r requirements.in
+django-staff-sso-client==1.0.0  # via -r requirements.in
 django-taggit==0.24.0     # via wagtail
 django-timezone-field==4.0  # via django-celery-beat
 django-treebeard==4.3     # via wagtail
-django==2.2.10
-django_storages==1.7.1
-djangorestframework==3.9.4
+django==2.2.10            # via -r requirements.in, directory-components, directory-constants, directory-healthcheck, django-admin-ip-restrictor, django-celery-beat, django-filter, django-redis, django-staff-sso-client, django-storages, django-taggit, django-timezone-field, django-treebeard, sigauth, wagtail
+django_storages==1.7.1    # via -r requirements.in
+djangorestframework==3.9.4  # via -r requirements.in, sigauth, wagtail
 docopt==0.6.2             # via notifications-python-client, num2words
 docutils==0.15.2          # via botocore
 draftjs-exporter==2.1.7   # via wagtail
 future==0.18.2            # via notifications-python-client
-gevent==1.2.2
+gevent==1.2.2             # via -r requirements.in
 greenlet==0.4.15          # via gevent
-gunicorn==19.5.0
-html2text==2018.1.9
+gunicorn==19.5.0          # via -r requirements.in
+html2text==2018.1.9       # via -r requirements.in
 html5lib==1.0.1           # via wagtail
 idna==2.8                 # via requests
 importlib-metadata==1.2.0  # via kombu
 jmespath==0.9.4           # via boto3, botocore
 jsonschema==3.0.1         # via directory-components
-kombu==4.6.6
-markdown==2.6
+kombu==4.6.6              # via -r requirements.in, celery
+markdown==2.6             # via -r requirements.in
 mohawk==0.3.4             # via sigauth
 monotonic==1.5            # via notifications-python-client
 more-itertools==8.0.0     # via zipp
-notifications-python-client==5.3.0
-num2words==0.5.10
+notifications-python-client==5.3.0  # via -r requirements.in
+num2words==0.5.10         # via -r requirements.in
 oauthlib==3.1.0           # via requests-oauthlib
-pillow==6.2.1
-psycopg2==2.7.3.2
-pycountry==19.8.18
+pillow==6.2.1             # via -r requirements.in, wagtail
+psycopg2==2.7.3.2         # via -r requirements.in
+pycountry==19.8.18        # via -r requirements.in
 pyjwt==1.7.1              # via notifications-python-client
 pyrsistent==0.15.6        # via jsonschema
 python-crontab==2.4.0     # via django-celery-beat
 python-dateutil==2.6.1    # via botocore, python-crontab
-pytube==9.2.2
+pytube==9.2.2             # via -r requirements.in
 pytz==2019.3              # via celery, django, django-modelcluster, django-timezone-field, wagtail
 raven==6.10.0             # via django-staff-sso-client
 redis==3.3.11             # via celery, django-redis
 requests-oauthlib==1.3.0  # via django-staff-sso-client
-requests==2.21.0
+requests==2.21.0          # via -r requirements.in, notifications-python-client, requests-oauthlib, wagtail
 s3transfer==0.1.13        # via boto3
-sentry-sdk==0.13.4
-sigauth==4.1.0
+sentry-sdk==0.13.4        # via -r requirements.in
+sigauth==4.1.0            # via -r requirements.in
 six==1.13.0               # via bleach, html5lib, jsonschema, mohawk, pyrsistent, python-dateutil, w3lib, wagtail
 sqlparse==0.3.0           # via django
 unidecode==1.1.1          # via wagtail
-urllib3==1.24.3
+urllib3==1.24.3           # via -r requirements.in, requests, sentry-sdk
 vine==1.3.0               # via amqp, celery
-w3lib==1.21.0
-wagtail-modeltranslation==0.10.2
-wagtail==2.6.3
-wagtailmedia==0.3.1
+w3lib==1.21.0             # via -r requirements.in
+wagtail-modeltranslation==0.10.2  # via -r requirements.in
+wagtail==2.6.3            # via -r requirements.in, wagtail-modeltranslation, wagtailmedia
+wagtailmedia==0.3.1       # via -r requirements.in
 webencodings==0.5.1       # via bleach, html5lib
-whitenoise==4.1.2
+whitenoise==4.1.2         # via -r requirements.in
 willow==1.1               # via wagtail
 zipp==0.6.0               # via importlib-metadata
 
diff --git a/requirements_test.txt b/requirements_test.txt
index c35d5328..f7921bdc 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -7,109 +7,109 @@
 amqp==2.5.2               # via kombu
 atomicwrites==1.2.1       # via pytest
 attrs==18.2.0             # via jsonschema, pytest
-beautifulsoup4==4.6.0
+beautifulsoup4==4.6.0     # via -r requirements_test.in, directory-components, wagtail
 billiard==3.5.0.5         # via celery
-bleach-whitelist==0.0.9
-bleach==3.0.2
-boto3==1.6.3
+bleach-whitelist==0.0.9   # via -r requirements.in
+bleach==3.1.1             # via -r requirements.in
+boto3==1.6.3              # via -r requirements.in
 botocore==1.9.23          # via boto3, s3transfer
-celery[redis]==4.2.1
+celery[redis]==4.2.1      # via -r requirements.in, django-celery-beat
 certifi==2018.11.29       # via requests, sentry-sdk
 chardet==3.0.4            # via requests
 click==7.0                # via pip-tools
 coverage==4.5.2           # via coveralls, pytest-cov
-coveralls==1.8.2
-directory-components==20.0.0
-directory-constants==18.6.0
-directory-healthcheck==1.1.1
-dj-database-url==0.5.0
-django-admin-ip-restrictor==2.1.0
-django-celery-beat==2.0.0
-django-debug-toolbar==2.0
-django-environ==0.4.5
-django-filter==2.2.0
+coveralls==1.8.2          # via -r requirements_test.in
+directory-components==20.0.0  # via -r requirements.in
+directory-constants==18.6.0  # via -r requirements.in, directory-components
+directory-healthcheck==1.1.1  # via -r requirements.in
+dj-database-url==0.5.0    # via -r requirements.in
+django-admin-ip-restrictor==2.1.0  # via -r requirements.in
+django-celery-beat==2.0.0  # via -r requirements.in
+django-debug-toolbar==2.0  # via -r requirements_test.in
+django-environ==0.4.5     # via -r requirements.in
+django-filter==2.2.0      # via -r requirements.in
 django-health-check==3.8.0  # via directory-healthcheck
 django-ipware==2.1.0      # via django-admin-ip-restrictor
 django-modelcluster==4.3  # via wagtail
 django-modeltranslation==0.13.1  # via wagtail-modeltranslation
-django-pglocks==1.0.2
-django-redis==4.10.0
-django-staff-sso-client==1.0.0
+django-pglocks==1.0.2     # via -r requirements.in
+django-redis==4.10.0      # via -r requirements.in
+django-staff-sso-client==1.0.0  # via -r requirements.in
 django-taggit==0.23.0     # via wagtail
 django-timezone-field==4.0  # via django-celery-beat
 django-treebeard==4.3     # via wagtail
-django==2.2.10
-django_storages==1.7.1
-djangorestframework==3.9.4
+django==2.2.10            # via -r requirements.in, directory-components, directory-constants, directory-healthcheck, django-admin-ip-restrictor, django-celery-beat, django-debug-toolbar, django-filter, django-redis, django-staff-sso-client, django-storages, django-taggit, django-timezone-field, django-treebeard, sigauth, wagtail
+django_storages==1.7.1    # via -r requirements.in
+djangorestframework==3.9.4  # via -r requirements.in, sigauth, wagtail
 docopt==0.6.2             # via coveralls, notifications-python-client, num2words
 docutils==0.14            # via botocore
 draftjs-exporter==2.1.5   # via wagtail
-factory-boy==2.8.1
+factory-boy==2.8.1        # via -r requirements_test.in, wagtail-factories
 faker==1.0.1              # via factory-boy
-flake8==3.6.0
-freezegun==0.3.11
+flake8==3.6.0             # via -r requirements_test.in
+freezegun==0.3.11         # via -r requirements_test.in
 future==0.17.1            # via notifications-python-client
-gevent==1.2.2
+gevent==1.2.2             # via -r requirements.in
 greenlet==0.4.15          # via gevent
-gunicorn==19.5.0
-html2text==2018.1.9
+gunicorn==19.5.0          # via -r requirements.in
+html2text==2018.1.9       # via -r requirements.in
 html5lib==1.0.1           # via wagtail
 idna==2.7                 # via requests
 importlib-metadata==0.20  # via kombu, pluggy, pytest
 jmespath==0.9.3           # via boto3, botocore
 jsonschema==3.0.1         # via directory-components
-kombu==4.6.6
-markdown==2.6
+kombu==4.6.6              # via -r requirements.in, celery
+markdown==2.6             # via -r requirements.in
 mccabe==0.6.1             # via flake8
 mohawk==0.3.4             # via sigauth
 monotonic==1.5            # via notifications-python-client
-more-itertools==4.3.0     # via pytest, zipp
-notifications-python-client==5.3.0
-num2words==0.5.10
+more-itertools==4.3.0     # via pytest
+notifications-python-client==5.3.0  # via -r requirements.in
+num2words==0.5.10         # via -r requirements.in
 oauthlib==3.0.1           # via requests-oauthlib
 packaging==18.0           # via pytest, pytest-sugar
-pillow==6.2.1
-pip-tools==4.3.0
+pillow==6.2.1             # via -r requirements.in, wagtail
+pip-tools==4.3.0          # via -r requirements_test.in
 pluggy==0.12.0            # via pytest
-psycopg2==2.7.3.2
+psycopg2==2.7.3.2         # via -r requirements.in
 py==1.7.0                 # via pytest
 pycodestyle==2.4.0        # via flake8
-pycountry==19.8.18
+pycountry==19.8.18        # via -r requirements.in
 pyflakes==2.0.0           # via flake8
 pyjwt==1.7.1              # via notifications-python-client
 pyparsing==2.3.0          # via packaging
 pyrsistent==0.15.2        # via jsonschema
-pytest-cov==2.7.1
-pytest-django==3.5.1
-pytest-sugar==0.9.2
-pytest==5.1.2
+pytest-cov==2.7.1         # via -r requirements_test.in
+pytest-django==3.5.1      # via -r requirements_test.in
+pytest-sugar==0.9.2       # via -r requirements_test.in
+pytest==5.1.2             # via -r requirements_test.in, pytest-cov, pytest-django, pytest-sugar
 python-crontab==2.4.0     # via django-celery-beat
 python-dateutil==2.6.1    # via botocore, faker, freezegun, python-crontab
-pytube==9.2.2
+pytube==9.2.2             # via -r requirements.in
 pytz==2018.7              # via celery, django, django-modelcluster, django-timezone-field, wagtail
 raven==6.10.0             # via django-staff-sso-client
 redis==2.10.6             # via celery, django-redis
-requests-mock==1.5.2
+requests-mock==1.5.2      # via -r requirements_test.in
 requests-oauthlib==1.2.0  # via django-staff-sso-client
-requests==2.21.0
+requests==2.21.0          # via -r requirements.in, coveralls, notifications-python-client, requests-mock, requests-oauthlib, wagtail
 s3transfer==0.1.13        # via boto3
-sentry-sdk==0.13.4
-sigauth==4.1.0
-six==1.12.0               # via bleach, faker, freezegun, html5lib, jsonschema, mohawk, more-itertools, packaging, pip-tools, pyrsistent, python-dateutil, requests-mock, w3lib, wagtail
+sentry-sdk==0.13.4        # via -r requirements.in
+sigauth==4.1.0            # via -r requirements.in
+six==1.12.0               # via bleach, faker, freezegun, html5lib, jsonschema, mohawk, more-itertools, packaging, pip-tools, python-dateutil, requests-mock, w3lib, wagtail
 sqlparse==0.2.4           # via django, django-debug-toolbar
 termcolor==1.1.0          # via pytest-sugar
 text-unidecode==1.2       # via faker
 unidecode==1.0.23         # via wagtail
-urllib3==1.24.2
+urllib3==1.24.2           # via -r requirements.in, requests, sentry-sdk
 vine==1.1.4               # via amqp
-w3lib==1.20.0
-wagtail-factories==2.0.0
-wagtail-modeltranslation==0.10.2
-wagtail==2.6.3
-wagtailmedia==0.3.1
+w3lib==1.20.0             # via -r requirements.in
+wagtail-factories==2.0.0  # via -r requirements_test.in
+wagtail-modeltranslation==0.10.2  # via -r requirements.in
+wagtail==2.6.3            # via -r requirements.in, wagtail-factories, wagtail-modeltranslation, wagtailmedia
+wagtailmedia==0.3.1       # via -r requirements.in
 wcwidth==0.1.7            # via pytest
 webencodings==0.5.1       # via bleach, html5lib
-whitenoise==4.1.2
+whitenoise==4.1.2         # via -r requirements.in
 willow==1.1               # via wagtail
 zipp==0.6.0               # via importlib-metadata
 
diff --git a/tests/core/test_views.py b/tests/core/test_views.py
index e7b1dfb2..9808c2cc 100644
--- a/tests/core/test_views.py
+++ b/tests/core/test_views.py
@@ -10,6 +10,7 @@
 from core import cache, helpers, permissions, views
 from core.helpers import CachedResponse
 from conf.signature import SignatureCheckPermission
+from components.models import ComponentsApp
 from tests.great_international.factories import InternationalSectorPageFactory
 from .helpers import clean_post_data
 
@@ -329,6 +330,21 @@ def test_translations_exposed(translated_page, settings, client):
     assert response.json()['meta']['languages'] == expected
 
 
+@pytest.mark.django_db
+def test_unserializable_page_requested(settings, client):
+    page = ComponentsApp.objects.create(
+        title_en_gb='the app',
+        depth=2,
+        path='/thing',
+    )
+
+    url = reverse('api:api:pages:detail', kwargs={'pk': page.pk})
+
+    response = client.get(url)
+
+    assert response.status_code == 204
+
+
 @pytest.mark.django_db
 def test_lookup_by_path(international_root_page, page, admin_client):
     # Creating a semi-realistic page structure and moving page into it