diff --git a/HISTORY.rst b/HISTORY.rst
index 87a378b..0744ec6 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,13 @@
 History
 =======
 
+2.5.0
+-----
+
+* Drop Python 3.8 support
+* Add Python 3.13 support
+* Add Django 5.1 support
+
 2.4.1
 -----
 
diff --git a/README.rst b/README.rst
index bb3493e..78f83d0 100644
--- a/README.rst
+++ b/README.rst
@@ -90,7 +90,7 @@ The codebase is targeted and tested against:
 
 * Django 3.2.x against Python 3.8, 3.9, 3.10
 * Django 4.2.x against Python 3.8, 3.9, 3.10, 3.11, 3.12
-* Django 5.0.x against Python 3.10, 3.11, 3.12
+* Django 5.1.x against Python 3.10, 3.11, 3.12
 
 To run the tests against all target environments, install `tox
 <https://testrun.org/tox/latest/>`_ and then execute the command::
diff --git a/docs/custom_usage.rst b/docs/custom_usage.rst
index cbb44d8..96be703 100644
--- a/docs/custom_usage.rst
+++ b/docs/custom_usage.rst
@@ -171,7 +171,7 @@ with the contents of a freshly generated UUID.
 
 In the example accounts app you would create a file named `backends.py`.::
 
-    from organizations.backends.defaults import InvitationBackend
+    from organizations.backends.defaults import InvitationBackend, make_random_password
 
 
     class CustomInvitations(InvitationBackend):
@@ -179,8 +179,10 @@ In the example accounts app you would create a file named `backends.py`.::
           try:
               user = self.user_model.objects.get(email=email)
           except self.user_model.DoesNotExist:
-              user = self.user_model.objects.create(email=email,
-                      password=self.user_model.objects.make_random_password())
+              user = self.user_model.objects.create(
+                  email=email,
+                  password=make_random_password(),
+              )
               user.is_active = False
               user.save()
           self.send_invitation(user, sender, **kwargs)
diff --git a/src/organizations/__init__.py b/src/organizations/__init__.py
index 8824ff5..24304d2 100644
--- a/src/organizations/__init__.py
+++ b/src/organizations/__init__.py
@@ -2,4 +2,4 @@
 
 __author__ = "Ben Lopatin"
 __email__ = "ben@benlopatin.com"
-__version__ = "2.4.1"
+__version__ = "2.5.0"
diff --git a/src/organizations/backends/defaults.py b/src/organizations/backends/defaults.py
index 18571f8..8ec9838 100644
--- a/src/organizations/backends/defaults.py
+++ b/src/organizations/backends/defaults.py
@@ -19,6 +19,7 @@
 from django.template import loader
 from django.urls import path
 from django.urls import reverse
+from django.utils.crypto import get_random_string
 from django.utils.translation import gettext as _
 
 from organizations.backends.forms import UserRegistrationForm
@@ -28,6 +29,20 @@
 from organizations.utils import model_field_attr
 
 
+def make_random_password(
+    length=10,
+    allowed_chars="abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789",
+):
+    """
+    Generate a random password with the given length and given
+    allowed_chars. The default value of allowed_chars does not have "I" or
+    "O" or letters and digits that look similar -- just to avoid confusion.
+
+    (Pulled directly from since-deprecated manager method in Django source)
+    """
+    return get_random_string(length, allowed_chars)
+
+
 class BaseBackend:
     """
     Base backend class for registering and inviting users to an organization
@@ -215,7 +230,7 @@ def register_by_email(self, email, sender=None, request=None, **kwargs):
             user = self.user_model.objects.create(
                 username=self.get_username(),
                 email=email,
-                password=self.user_model.objects.make_random_password(),
+                password=make_random_password(),
             )
             user.is_active = False
             user.save()
@@ -248,7 +263,7 @@ def create_view(self, request):
                 user = self.user_model.objects.create(
                     username=self.get_username(),
                     email=form.cleaned_data["email"],
-                    password=self.user_model.objects.make_random_password(),
+                    password=make_random_password(),
                 )
                 user.is_active = False
                 user.save()
@@ -317,11 +332,11 @@ def invite_by_email(self, email, sender=None, request=None, **kwargs):
                 user = self.user_model.objects.create(
                     username=self.get_username(),
                     email=email,
-                    password=self.user_model.objects.make_random_password(),
+                    password=make_random_password(),
                 )
             else:
                 user = self.user_model.objects.create(
-                    email=email, password=self.user_model.objects.make_random_password()
+                    email=email, password=make_random_password()
                 )
             user.is_active = False
             user.save()
diff --git a/tox.ini b/tox.ini
index 51dd1b3..2c86431 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,18 @@
 [tox]
 envlist =
     flake8,
-    py{38,39,310}-django{32},
-    py{38,39}-django{42},
-    py{310,311,312}-django{42,50}
+    py{39,310}-django{32},
+    py{39}-django{42},
+    py{310,311,312}-django{42}
+    py{310,311,312,313}-django{51}
 
 [gh-actions]
 python =
-    3.8: py38
     3.9: py39
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
 
 [build-system]
 build-backend = "hatchling.build"
@@ -23,22 +24,22 @@ setenv =
     PYTHONPATH = {toxinidir}:{toxinidir}/organizations
 commands = pytest {posargs} --cov=organizations
 basepython =
-    py38: python3.8
     py39: python3.9
     py310: python3.10
     py311: python3.11
     py312: python3.12
+    py313: python3.13
 deps =
     hatch>=1.7.0
     django32: Django>=3.2,<4
     django42: Django>=4.2,<4.3
-    django50: Django>=5.0,<5.1
+    django51: Django>=5.1,<5.2
 extras = tests
 
 [testenv:flake8]
 basepython=python3
 deps=
-    flake8==3.8.3
+    flake8==3.12.7
 commands=
     flake8 src/organizations tests