diff --git a/Pipfile b/Pipfile
index 9854e5c9f..7cbd65b55 100644
--- a/Pipfile
+++ b/Pipfile
@@ -10,12 +10,12 @@ name = "piwheels"
 
 [packages]
 dateparser = "~=1.1"
-django = "~=3.2"
+django = "~=4.0"
 django-cors-headers = "*"
 django-extensions = "*"
 django-filter = "~=21.1"
-django-q = "~=1.3.4"
-djangorestframework = "~=3.13.1"
+django-q = "~=1.3"
+djangorestframework = "~=3.13"
 filelock = "*"
 fuzzywuzzy = {extras = ["speedup"], version = "*"}
 gunicorn = "*"
@@ -35,8 +35,8 @@ scikit-learn="==1.0.2"
 whitenoise = "~=6.0.0"
 watchdog = "~=2.1.0"
 whoosh="~=2.7.4"
-inotifyrecursive = "~=0.3.4"
-ocrmypdf = "~=13.4.1"
+inotifyrecursive = "~=0.3"
+ocrmypdf = "~=13.4"
 tqdm = "*"
 tika = "*"
 # TODO: This will sadly also install daphne+dependencies,
diff --git a/Pipfile.lock b/Pipfile.lock
index 9f93ef0f1..8d0b9cfc0 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "93ddbf2da13c20b786f08c205ec107c6129493dfc5c07b03fa0db00abc97257f"
+            "sha256": "7e76d6b807f96506f56c1bddb36b44deda6745014e5ed7c94f047fc1eb972eb8"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -280,11 +280,11 @@
         },
         "django": {
             "hashes": [
-                "sha256:9772e6935703e59e993960832d66a614cf0233a1c5123bc6224ecc6ad69e41e2",
-                "sha256:9b06c289f9ba3a8abea16c9c9505f25107809fb933676f6c891ded270039d965"
+                "sha256:1239218849e922033a35d2a2f777cb8bee18bd725416744074f455f34ff50d0c",
+                "sha256:77ff2e7050e3324c9b67e29b6707754566f58514112a9ac73310f60cd5261930"
             ],
             "index": "pypi",
-            "version": "==3.2.12"
+            "version": "==4.0.3"
         },
         "django-cors-headers": {
             "hashes": [
diff --git a/requirements.txt b/requirements.txt
index 3c3a6ab0d..365d2d1a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ django-extensions==3.1.5
 django-filter==21.1
 django-picklefield==3.0.1; python_version >= '3'
 django-q==1.3.9
-django==3.2.12
+django==4.0.3
 djangorestframework==3.13.1
 filelock==3.6.0
 fuzzywuzzy[speedup]==0.18.0
diff --git a/src/documents/tests/test_api.py b/src/documents/tests/test_api.py
index ecfa84046..9c43f174a 100644
--- a/src/documents/tests/test_api.py
+++ b/src/documents/tests/test_api.py
@@ -579,13 +579,13 @@ class TestDocumentApi(DirectoriesMixin, APITestCase):
         d3.tags.add(t2)
         d4 = Document.objects.create(
             checksum="4",
-            created=timezone.datetime(2020, 7, 13),
+            created=timezone.make_aware(datetime.datetime(2020, 7, 13)),
             content="test",
         )
         d4.tags.add(t2)
         d5 = Document.objects.create(
             checksum="5",
-            added=timezone.datetime(2020, 7, 13),
+            added=timezone.make_aware(datetime.datetime(2020, 7, 13)),
             content="test",
         )
         d6 = Document.objects.create(checksum="6", content="test2")
@@ -1897,21 +1897,21 @@ class TestBulkDownload(DirectoriesMixin, APITestCase):
             filename="docA.pdf",
             mime_type="application/pdf",
             checksum="B",
-            created=datetime.datetime(2021, 1, 1),
+            created=timezone.make_aware(datetime.datetime(2021, 1, 1)),
         )
         self.doc2b = Document.objects.create(
             title="document A",
             filename="docA2.pdf",
             mime_type="application/pdf",
             checksum="D",
-            created=datetime.datetime(2021, 1, 1),
+            created=timezone.make_aware(datetime.datetime(2021, 1, 1)),
         )
         self.doc3 = Document.objects.create(
             title="document B",
             filename="docB.jpg",
             mime_type="image/jpeg",
             checksum="C",
-            created=datetime.datetime(2020, 3, 21),
+            created=timezone.make_aware(datetime.datetime(2020, 3, 21)),
             archive_filename="docB.pdf",
             archive_checksum="D",
         )
diff --git a/src/documents/tests/test_consumer.py b/src/documents/tests/test_consumer.py
index 27d65d4a4..af54255e0 100644
--- a/src/documents/tests/test_consumer.py
+++ b/src/documents/tests/test_consumer.py
@@ -5,6 +5,11 @@ import tempfile
 from unittest import mock
 from unittest.mock import MagicMock
 
+try:
+    import zoneinfo
+except ImportError:
+    import backports.zoneinfo as zoneinfo
+
 from django.conf import settings
 from django.test import override_settings
 from django.test import TestCase
@@ -341,7 +346,7 @@ class TestConsumer(DirectoriesMixin, TestCase):
 
         self._assert_first_last_send_progress()
 
-        self.assertEqual(document.created.tzinfo.zone, "America/Chicago")
+        self.assertEqual(document.created.tzinfo, zoneinfo.ZoneInfo("America/Chicago"))
 
     @override_settings(PAPERLESS_FILENAME_FORMAT=None)
     def testDeleteMacFiles(self):
diff --git a/src/documents/views.py b/src/documents/views.py
index b8814ab81..0564e5469 100644
--- a/src/documents/views.py
+++ b/src/documents/views.py
@@ -18,6 +18,7 @@ from django.db.models.functions import Lower
 from django.http import Http404
 from django.http import HttpResponse
 from django.http import HttpResponseBadRequest
+from django.utils.decorators import method_decorator
 from django.utils.translation import get_language
 from django.views.decorators.cache import cache_control
 from django.views.generic import TemplateView
@@ -332,7 +333,7 @@ class DocumentViewSet(
             raise Http404()
 
     @action(methods=["get"], detail=True)
-    @cache_control(public=False, max_age=315360000)
+    @method_decorator(cache_control(public=False, max_age=315360000))
     def thumb(self, request, pk=None):
         try:
             doc = Document.objects.get(id=pk)