diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 9d521d1d..523f2bec 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -10,7 +10,7 @@ permissions: {}
 
 jobs:
   package:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 10
 
     steps:
@@ -24,7 +24,7 @@ jobs:
   deploy:
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags') && github.repository == 'pytest-dev/pytest-django'
     needs: [package]
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     environment: deploy
     timeout-minutes: 15
     permissions:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fe8e6b43..cc1da1c4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ permissions: {}
 
 jobs:
   test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     continue-on-error: ${{ matrix.allow_failure }}
     timeout-minutes: 15
     permissions:
@@ -64,11 +64,11 @@ jobs:
       matrix:
         include:
         - name: linting,docs
-          python: '3.12'
+          python: '3.13'
           allow_failure: false
 
-        - name: py312-dj51-postgres-xdist-coverage
-          python: '3.12'
+        - name: py313-dj51-postgres-xdist-coverage
+          python: '3.13'
           allow_failure: false
 
         - name: py312-dj42-postgres-xdist-coverage
@@ -103,8 +103,8 @@ jobs:
           python: '3.9'
           allow_failure: false
 
-        - name: py312-djmain-sqlite-coverage
-          python: '3.12'
+        - name: py313-djmain-sqlite-coverage
+          python: '3.13'
           allow_failure: true
 
         - name: py312-dj51-sqlite-xdist-coverage
@@ -139,7 +139,7 @@ jobs:
     needs:
     - test
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
     - name: Decide whether the needed jobs succeeded or failed
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 617132b7..990ec51c 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,20 @@
 Changelog
 =========
 
+v4.10.0 (Not released yet)
+--------------------------
+
+Compatibility
+^^^^^^^^^^^^^
+
+* Added official support for Python 3.13.
+
+Bugfixes
+^^^^^^^^
+
+* Fixed lock/unlock of db breaks if pytest is executed twice in the same process.
+
+
 v4.9.0 (2024-09-02)
 -------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index 9f922dc4..914e96cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,6 +33,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Software Development :: Testing",
@@ -138,7 +139,6 @@ ignore = [
     "PLR0913",  # Too many arguments in function definition
     "PLR2004",  # Magic value used in comparison, consider replacing 3 with a constant variable
     "PT001",    # Use `@pytest.fixture()` over `@pytest.fixture`
-    "PT004",    # Fixture `fixture_with_db` does not return anything, add leading underscore
     "PT023",    # Use `@pytest.mark.django_db()` over `@pytest.mark.django_db`
 ]
 
diff --git a/pytest_django/__init__.py b/pytest_django/__init__.py
index 4e551d5b..e4bb08f5 100644
--- a/pytest_django/__init__.py
+++ b/pytest_django/__init__.py
@@ -10,8 +10,8 @@
 
 
 __all__ = [
-    "__version__",
     "DjangoAssertNumQueries",
     "DjangoCaptureOnCommitCallbacks",
     "DjangoDbBlocker",
+    "__version__",
 ]
diff --git a/pytest_django/fixtures.py b/pytest_django/fixtures.py
index 8c4cad94..1daab118 100644
--- a/pytest_django/fixtures.py
+++ b/pytest_django/fixtures.py
@@ -41,25 +41,25 @@
 
 
 __all__ = [
-    "django_db_setup",
+    "_live_server_helper",
+    "admin_client",
+    "admin_user",
+    "async_client",
+    "async_rf",
+    "client",
     "db",
-    "transactional_db",
+    "django_assert_max_num_queries",
+    "django_assert_num_queries",
+    "django_capture_on_commit_callbacks",
     "django_db_reset_sequences",
     "django_db_serialized_rollback",
-    "admin_user",
+    "django_db_setup",
     "django_user_model",
     "django_username_field",
-    "client",
-    "async_client",
-    "admin_client",
+    "live_server",
     "rf",
-    "async_rf",
     "settings",
-    "live_server",
-    "_live_server_helper",
-    "django_assert_num_queries",
-    "django_assert_max_num_queries",
-    "django_capture_on_commit_callbacks",
+    "transactional_db",
 ]
 
 
diff --git a/pytest_django/plugin.py b/pytest_django/plugin.py
index 285f1733..08d961a6 100644
--- a/pytest_django/plugin.py
+++ b/pytest_django/plugin.py
@@ -129,13 +129,13 @@ def pytest_addoption(parser: pytest.Parser) -> None:
 
     parser.addini(
         "django_find_project",
-        "Automatically find and add a Django project to the " "Python path.",
+        "Automatically find and add a Django project to the Python path.",
         type="bool",
         default=True,
     )
     parser.addini(
         "django_debug_mode",
-        "How to set the Django DEBUG setting (default `False`). " "Use `keep` to not override.",
+        "How to set the Django DEBUG setting (default `False`). Use `keep` to not override.",
         default="False",
     )
     group.addoption(
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 7f1a1763..00000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from setuptools import setup
-
-if __name__ == "__main__":
-    setup()
diff --git a/tests/test_fixtures.py b/tests/test_fixtures.py
index ed7fcba2..dd695136 100644
--- a/tests/test_fixtures.py
+++ b/tests/test_fixtures.py
@@ -104,7 +104,7 @@ def test_django_assert_num_queries_db(
             with django_assert_num_queries(2) as captured:
                 Item.objects.create(name="quux")
         assert excinfo.value.args == (
-            "Expected to perform 2 queries but 1 was done " "(add -v option to show queries)",
+            "Expected to perform 2 queries but 1 was done (add -v option to show queries)",
         )
         assert len(captured.captured_queries) == 1
 
@@ -556,11 +556,10 @@ def test_specified_port_django_111(self, django_pytester: DjangoPytester) -> Non
             sock.close()
 
         django_pytester.create_test_module(
+            f"""
+            def test_with_live_server(live_server):
+                assert live_server.port == {port}
             """
-        def test_with_live_server(live_server):
-            assert live_server.port == %d
-        """
-            % port
         )
 
         django_pytester.runpytest_subprocess(f"--liveserver=localhost:{port}")
diff --git a/tests/test_manage_py_scan.py b/tests/test_manage_py_scan.py
index 053c5c2a..76ec8ad7 100644
--- a/tests/test_manage_py_scan.py
+++ b/tests/test_manage_py_scan.py
@@ -123,7 +123,7 @@ def test_django_project_scan_disabled_invalid_settings(
     assert result.ret != 0
 
     result.stderr.fnmatch_lines(["*ImportError*DOES_NOT_EXIST*"])
-    result.stderr.fnmatch_lines(["*pytest-django did not search for " "Django projects*"])
+    result.stderr.fnmatch_lines(["*pytest-django did not search for Django projects*"])
 
 
 @pytest.mark.django_project(project_root="django_project_root", create_manage_py=True)
diff --git a/tox.ini b/tox.ini
index c72b1f42..d9ce1c6d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
 envlist =
+    py313-dj{main,51}-postgres
     py312-dj{main,51,50,42}-postgres
     py311-dj{main,51,50,42}-postgres
     py310-dj{main,51,50,42}-postgres
@@ -49,8 +50,8 @@ commands =
 [testenv:linting]
 extras =
 deps =
-    ruff==0.6.3
-    mypy==1.11.2
+    ruff==0.9.5
+    mypy==1.15.0
 commands =
     ruff check {posargs:pytest_django pytest_django_test tests}
     ruff format --quiet --diff {posargs:pytest_django pytest_django_test tests}