diff --git a/.coveragerc b/.coveragerc
index 5d18877..00d6b92 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,4 +1,4 @@
 [run]
 include = edc_sites/*
 omit = edc_sites/tests/*,edc_sites/migrations/*
-branch = 1
\ No newline at end of file
+branch = 1
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 60620ab..950e9aa 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,9 +12,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.12']
-        django-version: ['4.2', '5.0', '5.1', 'dev']
+        python-version: ['3.12', '3.13']
+        django-version: ['5.1', 'dev']
         database-engine: ["mysql", "postgres"]
+
     services:
       mysql:
         image: mysql:latest
@@ -68,7 +69,6 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/tox.txt
 
-
       - name: Tox tests
         run: |
           tox -v
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a32918b..bace820 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -3,20 +3,20 @@ exclude: tests/etc/user-*
 
 repos:
   - repo: https://github.com/PyCQA/bandit
-    rev: 1.7.7
+    rev: 1.7.10
     hooks:
       - id: bandit
         args:
           - "-x *test*.py"
 
   - repo: https://github.com/psf/black
-    rev: 24.2.0
+    rev: 24.10.0
     hooks:
       - id: black
-        language_version: python3.11
+        language_version: python3.12
 
   - repo: https://github.com/pycqa/flake8
-    rev: 7.0.0
+    rev: 7.1.1
     hooks:
       - id: flake8
         args:
@@ -28,21 +28,24 @@ repos:
       - id: isort
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.5.0
+    rev: v5.0.0
     hooks:
-      - id: requirements-txt-fixer
-        files: requirements/.*\.txt$
-      - id: trailing-whitespace
       - id: check-added-large-files
-      - id: fix-byte-order-marker
       - id: check-docstring-first
       - id: check-executables-have-shebangs
       - id: check-merge-conflict
+      - id: check-toml
+      - id: check-yaml
       - id: debug-statements
       - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: fix-byte-order-marker
+      - id: requirements-txt-fixer
+        files: requirements/.*\.txt$
+      - id: trailing-whitespace
 
   - repo: https://github.com/adrienverge/yamllint
-    rev: v1.34.0
+    rev: v1.35.1
     hooks:
       - id: yamllint
         args:
diff --git a/AUTHORS b/AUTHORS
index 3bc0afa..eb5e7d3 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1 +1 @@
-Erik van Widenfelt <ew2789@gmail.com>
\ No newline at end of file
+Erik van Widenfelt <ew2789@gmail.com>
diff --git a/CHANGES b/CHANGES
index f2f7429..aae0dc1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,4 +5,3 @@
   - feature to limit to related site in FK and M2M
   - filter queryset by site
   - check for site attr
-
diff --git a/README.rst b/README.rst
index 14b5256..01919bc 100644
--- a/README.rst
+++ b/README.rst
@@ -226,4 +226,3 @@ For example:
 
 .. _sites_framework: https://docs.djangoproject.com/en/dev/ref/contrib/sites/
 __ sites_framework_
-
diff --git a/edc_sites/modelform_mixins.py b/edc_sites/modelform_mixins.py
index 6e296c3..92bab53 100644
--- a/edc_sites/modelform_mixins.py
+++ b/edc_sites/modelform_mixins.py
@@ -1,7 +1,12 @@
 from __future__ import annotations
 
+from typing import TYPE_CHECKING, Type
+
 from django import forms
-from django.contrib.sites.models import Site
+from django.apps import apps as django_apps
+
+if TYPE_CHECKING:
+    from django.contrib.sites.models import Site
 
 __all__ = ["SiteModelFormMixin"]
 
@@ -26,12 +31,18 @@ def clean(self) -> dict:
         self.validate_with_current_site()
         return cleaned_data
 
+    @property
+    def site_model_cls(self) -> Type[Site]:
+        return django_apps.get_model("sites.site")
+
     @property
     def site(self) -> Site:
         if related_visit := getattr(self, "related_visit", None):
             return related_visit.site
         return (
-            self.cleaned_data.get("site") or self.instance.site or Site.objects.get_current()
+            self.cleaned_data.get("site")
+            or self.instance.site
+            or self.site_model_cls.objects.get_current()
         )
 
     def validate_with_current_site(self) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index cd9712f..6a581d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,17 +1,18 @@
 [build-system]
 requires = ["setuptools>=60", "setuptools-scm>=8.0"]
+build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]
-version_file="_version.py"
+version_file = "_version.py"
 
 [tool.black]
 line-length = 95
-target-version = ["py311"]
+target-version = ["py312"]
 extend-exclude = '''^(.*\/)*\b(migrations)\b($|\/.*$)'''
 
 [tool.isort]
 profile = "black"
-py_version = "311"
+py_version = "312"
 skip = [".tox", ".eggs", "migrations"]
 
 [tool.coverage.run]
@@ -35,35 +36,33 @@ exclude_lines = [
 legacy_tox_ini = """
 [tox]
 envlist =
-    py{311}-dj{42,50,dev},
-    py{312}-dj{50},
+    py{312,313}-dj{51,dev},
     lint
+    pre-commit
 
 isolated_build = true
 
 [gh-actions]
 python =
-    3.11: py311, lint
-    3.12: py312
+    3.12: py312, lint, pre-commit
+    3.13: py313
 
 [gh-actions:env]
 DJANGO =
-    4.2: dj42, lint
-    5.0: dj50
-    dev: djdev
+    5.1: dj51
+    dev: djdev, lint, pre-commit
 
 [testenv]
 deps =
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/tox.txt
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/test_utils.txt
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/edc.txt
-    -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/third_party_dev.txt
-    dj42: Django>=4.2,<5.0
-    dj50: Django>=5.0
+    dj51: Django>=5.1,<5.2
     djdev: https://github.com/django/django/tarball/main
 
 commands =
-    pip install -U pip coverage[toml]
+    pip install -U pip
+    python --version
     pip --version
     pip freeze
     coverage run -a runtests.py
@@ -72,7 +71,19 @@ commands =
 [testenv:lint]
 deps = -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/lint.txt
 commands =
+    python --version
+    pip --version
+    pip freeze
     isort --profile=black --check --diff .
     black --check --diff .
     flake8 .
+
+[testenv:pre-commit]
+deps = pre-commit
+commands =
+    python --version
+    pip --version
+    pip freeze
+    pre-commit autoupdate
+    pre-commit run --all-files
 """
diff --git a/setup.cfg b/setup.cfg
index 66ae399..1517c3a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -12,16 +12,15 @@ keywords = django Edc sites, clinicedc, clinical trials
 classifiers=
     Environment :: Web Environment
     Framework :: Django
-    Framework :: Django :: 4.2
+    Framework :: Django :: 5.1
     Intended Audience :: Developers
     Intended Audience :: Science/Research
     Operating System :: OS Independent
-    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     License :: OSI Approved :: GNU General Public License v3 (GPLv3)
 
-
 [options]
-python_requires = >=3.11
+python_requires = >=3.12
 zip_safe = False
 include_package_data = True
 packages = find: