diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 98c452bd1..d8e2bb2fe 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,30 +8,31 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, '3.10', '3.11', '3.12']
+        python-version: [3.9, '3.10', '3.11', '3.12', '3.13']
         requirements-file: [
           django-4.2.txt,
           django-5.0.txt,
           django-5.1.txt,
+          django-5.2.txt,
           django-main.txt,
         ]
         custom-image-model: [false, true]
         os: [
-          ubuntu-20.04,
+          ubuntu-latest,
         ]
         exclude:
-          - requirements-file: django-5.0.txt
-            python-version: 3.8
           - requirements-file: django-5.0.txt
             python-version: 3.9
-          - requirements-file: django-5.1.txt
-            python-version: 3.8
           - requirements-file: django-5.1.txt
             python-version: 3.9
-          - requirements-file: django-main.txt
-            python-version: 3.8
+          - requirements-file: django-5.2.txt
+            python-version: 3.9
           - requirements-file: django-main.txt
             python-version: 3.9
+          - requirements-file: django-main.txt
+            python-version: 3.10
+          - requirements-file: django-main.txt
+            python-version: 3.11
 
     steps:
     - uses: actions/checkout@v1
@@ -40,7 +41,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: library prerequisites
-      run: sudo apt-get install python-dev libpq-dev libmagic1 gcc libxml2-dev libxslt1-dev libjpeg62 libopenjp2-7 -y
+      run: sudo apt-get install python-dev-is-python3 libpq-dev libmagic1 gcc libxml2-dev libxslt1-dev libjpeg62 libopenjp2-7 -y
     - name: Install extra dependencies
       run: pip install lxml
       if: matrix.python-version == '3.10'
@@ -53,6 +54,6 @@ jobs:
       run: echo "CUSTOM_IMAGE=custom_image.Image" >> $GITHUB_ENV
       if: ${{ matrix.custom-image-model }}
     - name: Run coverage
-      run: coverage run ./tests/settings.py 
+      run: coverage run ./tests/settings.py
     - name: Upload Coverage to Codecov
       uses: codecov/codecov-action@v1
diff --git a/filer/admin/fileadmin.py b/filer/admin/fileadmin.py
index 517f57380..9c38824ee 100644
--- a/filer/admin/fileadmin.py
+++ b/filer/admin/fileadmin.py
@@ -60,7 +60,7 @@ class FileAdmin(PrimitivePermissionAwareModelAdmin):
     list_display = ('label',)
     list_per_page = 10
     search_fields = ['name', 'original_filename', 'sha1', 'description']
-    autocomplete_fields = ('owner',)
+    autocomplete_fields = ['owner']
     readonly_fields = ('sha1', 'display_canonical')
 
     form = FileAdminChangeFrom
diff --git a/filer/admin/folderadmin.py b/filer/admin/folderadmin.py
index 8b3190f8e..1bc486417 100644
--- a/filer/admin/folderadmin.py
+++ b/filer/admin/folderadmin.py
@@ -5,6 +5,7 @@
 from urllib.parse import quote as urlquote
 from urllib.parse import unquote as urlunquote
 
+from django import VERSION as DJANGO_VERSION
 from django import forms
 from django.conf import settings as django_settings
 from django.contrib import messages
@@ -777,9 +778,15 @@ def delete_files_or_folders(self, request, files_queryset, folders_queryset):
             n = files_queryset.count() + folders_queryset.count()
             if n:
                 # delete all explicitly selected files
-                for f in files_queryset:
-                    self.log_deletion(request, f, force_str(f))
-                    f.delete()
+                if DJANGO_VERSION >= (5, 1):
+                    self.log_deletions(request, files_queryset)
+                    # Still need to delete files individually (not only the database entries)
+                    for f in files_queryset:
+                        f.delete()
+                else:
+                    for f in files_queryset:
+                        self.log_deletion(request, f, force_str(f))
+                        f.delete()
                 # delete all files in all selected folders and their children
                 # This would happen automatically by ways of the delete
                 # cascade, but then the individual .delete() methods won't be
@@ -788,13 +795,24 @@ def delete_files_or_folders(self, request, files_queryset, folders_queryset):
                 for folder in folders_queryset:
                     folder_ids.add(folder.id)
                     folder_ids.update(folder.get_descendants_ids())
-                for f in File.objects.filter(folder__in=folder_ids):
-                    self.log_deletion(request, f, force_str(f))
-                    f.delete()
+                if DJANGO_VERSION >= (5, 1):
+                    qs = File.objects.filter(folder__in=folder_ids)
+                    self.log_deletions(request, qs)
+                    # Still need to delete files individually (not only the database entries)
+                    for f in qs:
+                        f.delete()
+                else:
+                    for f in File.objects.filter(folder__in=folder_ids):
+                        self.log_deletion(request, f, force_str(f))
+                        f.delete()
                 # delete all folders
-                for f in folders_queryset:
-                    self.log_deletion(request, f, force_str(f))
-                    f.delete()
+                if DJANGO_VERSION >= (5, 1):
+                    self.log_deletions(request, files_queryset)
+                    folders_queryset.delete()
+                else:
+                    for f in folders_queryset:
+                        self.log_deletion(request, f, force_str(f))
+                        f.delete()
                 self.message_user(request, _("Successfully deleted %(count)d files and/or folders.") % {"count": n, })
             # Return None to display the change list page again.
             return None
diff --git a/filer/admin/permissionadmin.py b/filer/admin/permissionadmin.py
index 1e8d75d54..7c6df458f 100644
--- a/filer/admin/permissionadmin.py
+++ b/filer/admin/permissionadmin.py
@@ -1,4 +1,6 @@
+from django import VERSION as django_version
 from django.contrib import admin
+from django.contrib.auth import get_user_model
 from django.utils.translation import gettext_lazy as _
 
 from .. import settings
@@ -19,6 +21,18 @@ class PermissionAdmin(admin.ModelAdmin):
     class Media:
         css = {'all': ['filer/css/admin_folderpermissions.css']}
 
+    def get_autocomplete_fields(self, request):
+        """Remove "owner" from autocomplete_fields is User model has no search_fields"""
+
+        autocomplete_fields = super().get_autocomplete_fields(request)
+        if django_version >= (5, 0):
+            user_admin = self.admin_site.get_model_admin(get_user_model())
+        else:
+            user_admin = self.admin_site._registry[get_user_model()]
+        if not user_admin.get_search_fields(request):
+            autocomplete_fields.remove('user')
+        return autocomplete_fields
+
     def get_queryset(self, request):
         qs = super().get_queryset(request)
         return qs.prefetch_related("group", "folder")
diff --git a/filer/admin/permissions.py b/filer/admin/permissions.py
index a060ea924..b3e7d00a7 100644
--- a/filer/admin/permissions.py
+++ b/filer/admin/permissions.py
@@ -1,8 +1,22 @@
+from django import VERSION as django_version
 from django.contrib import admin
+from django.contrib.auth import get_user_model
 from django.urls import reverse
 
 
 class PrimitivePermissionAwareModelAdmin(admin.ModelAdmin):
+    def get_autocomplete_fields(self, request):
+        """Remove "owner" from autocomplete_fields is User model has no search_fields"""
+
+        autocomplete_fields = super().get_autocomplete_fields(request)
+        if django_version >= (5, 0):
+            user_admin = self.admin_site.get_model_admin(get_user_model())
+        else:
+            user_admin = self.admin_site._registry[get_user_model()]
+        if not user_admin.get_search_fields(request) and 'owner' in autocomplete_fields:
+            autocomplete_fields.remove('owner')
+        return autocomplete_fields
+
     def has_add_permission(self, request):
         # we don't have a "add" permission... but all adding is handled
         # by special methods that go around these permissions anyway
diff --git a/tests/requirements/django-5.2.txt b/tests/requirements/django-5.2.txt
new file mode 100644
index 000000000..5286d7dc8
--- /dev/null
+++ b/tests/requirements/django-5.2.txt
@@ -0,0 +1,4 @@
+-r base.txt
+
+django>=5.2a1,<5.3
+django_polymorphic>=3.1
diff --git a/tox.ini b/tox.ini
index d04a03bd2..3fba0702f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,13 +4,15 @@ envlist =
     isort
     docs
     frontend
-    py{310,311,312}-{dj42,dj50,djmain}-{swap,noswap}
+    py{310,311,312}-{dj42,dj50,dj51,dj52}-{swap,noswap}
+    py{312,313,312}-{djmain}-{swap,noswap}
 
 [gh-actions]
 python =
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
 
 skip_missing_interpreters=True
 
@@ -21,11 +23,13 @@ allowlist_externals =
 deps =
     dj42: -r tests/requirements/django-4.2.txt
     dj50: -r tests/requirements/django-5.0.txt
+    dj51: -r tests/requirements/django-5.1.txt
+    dj52: -r tests/requirements/django-5.2.txt
     djmain: -r tests/requirements/django-main.txt
 commands =
     {envpython} --version
     {env:COMMAND:coverage} erase
-    {env:COMMAND:coverage} run setup.py test
+    {env:COMMAND:coverage} run tests/settings.py
     {env:COMMAND:coverage} report
 setenv =
     swap: CUSTOM_IMAGE=custom_image.Image