diff --git a/docs/howto/upgrade-version.txt b/docs/howto/upgrade-version.txt
index 9be65a9df0a..02e0cbf9a0b 100644
--- a/docs/howto/upgrade-version.txt
+++ b/docs/howto/upgrade-version.txt
@@ -69,7 +69,7 @@ environment variable. For example, to show warnings while running tests:
 
 If you're not using the Django test runner, you may need to also ensure that
 any console output is not captured which would hide deprecation warnings. For
-example, if you use `pytest <https://pytest.org/>`__:
+example, if you use `pytest <https://docs.pytest.org/>`__:
 
 .. code-block:: console
 
diff --git a/docs/internals/contributing/writing-code/unit-tests.txt b/docs/internals/contributing/writing-code/unit-tests.txt
index a2f9b392aa2..2bc261666e1 100644
--- a/docs/internals/contributing/writing-code/unit-tests.txt
+++ b/docs/internals/contributing/writing-code/unit-tests.txt
@@ -55,10 +55,10 @@ Having problems? See :ref:`troubleshooting-unit-tests` for some common issues.
 Running tests using ``tox``
 ---------------------------
 
-`Tox <https://tox.readthedocs.io/>`_ is a tool for running tests in different
-virtual environments. Django includes a basic ``tox.ini`` that automates some
-checks that our build server performs on pull requests. To run the unit tests
-and other checks (such as :ref:`import sorting <coding-style-imports>`, the
+`Tox <https://tox.wiki/>`_ is a tool for running tests in different virtual
+environments. Django includes a basic ``tox.ini`` that automates some checks
+that our build server performs on pull requests. To run the unit tests and
+other checks (such as :ref:`import sorting <coding-style-imports>`, the
 :ref:`documentation spelling checker <documentation-spelling-check>`, and
 :ref:`code formatting <coding-style-python>`), install and run the ``tox``
 command from any place in the Django source tree:
diff --git a/docs/intro/reusable-apps.txt b/docs/intro/reusable-apps.txt
index fe225694850..21a6e0f6341 100644
--- a/docs/intro/reusable-apps.txt
+++ b/docs/intro/reusable-apps.txt
@@ -186,7 +186,7 @@ this. For a small app like polls, this process isn't too difficult.
 #. Next we'll create ``pyproject.toml``, ``setup.cfg``, and ``setup.py`` files
    which detail how to build and install the app. A full explanation of these
    files is beyond the scope of this tutorial, but the `setuptools
-   documentation <https://setuptools.readthedocs.io/en/latest/>`_ has a good
+   documentation <https://setuptools.pypa.io/en/latest/>`_ has a good
    explanation. Create the ``django-polls/pyproject.toml``,
    ``django-polls/setup.cfg``, and ``django-polls/setup.py`` files with the
    following contents:
diff --git a/docs/ref/contrib/gis/feeds.txt b/docs/ref/contrib/gis/feeds.txt
index 8705d518157..644391f9c69 100644
--- a/docs/ref/contrib/gis/feeds.txt
+++ b/docs/ref/contrib/gis/feeds.txt
@@ -13,7 +13,7 @@ Django's, please consult :doc:`Django's syndication documentation
 
 .. _W3C Geo: https://www.w3.org/2003/01/geo/
 
-__ http://georss.org/simple.html
+__ https://georss.org
 
 Example
 =======
diff --git a/docs/ref/contrib/syndication.txt b/docs/ref/contrib/syndication.txt
index 71be654f53c..1b255c6b407 100644
--- a/docs/ref/contrib/syndication.txt
+++ b/docs/ref/contrib/syndication.txt
@@ -1043,7 +1043,7 @@ and there are a set of methods that ``SyndicationFeed`` calls to get these extra
 attributes. Thus, you can subclass the appropriate feed generator class
 (``Atom1Feed`` or ``Rss201rev2Feed``) and extend these callbacks. They are:
 
-.. _georss: http://georss.org/
+.. _georss: https://georss.org
 .. _itunes podcast format: https://help.apple.com/itc/podcasts_connect/#/itcb54353390
 
 ``SyndicationFeed.root_attributes(self)``
diff --git a/docs/ref/unicode.txt b/docs/ref/unicode.txt
index d35476ada75..cf0f9d3e0e5 100644
--- a/docs/ref/unicode.txt
+++ b/docs/ref/unicode.txt
@@ -28,7 +28,7 @@ able to store certain characters in the database, and information will be lost.
   for internal encoding.
 
 .. _MySQL manual: https://dev.mysql.com/doc/refman/en/charset-database.html
-.. _PostgreSQL manual: https://www.postgresql.org/docs/current/multibyte.html#id-1.6.10.5.6
+.. _PostgreSQL manual: https://www.postgresql.org/docs/current/multibyte.html#id-1.6.11.5.6
 .. _Oracle manual: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/index.html
 .. _section 2: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/choosing-character-set.html
 .. _section 11: https://docs.oracle.com/en/database/oracle/oracle-database/18/nlspg/character-set-migration.html
diff --git a/docs/topics/cache.txt b/docs/topics/cache.txt
index f405e171d51..e769fe0da91 100644
--- a/docs/topics/cache.txt
+++ b/docs/topics/cache.txt
@@ -185,7 +185,7 @@ To use Redis as your cache backend with Django:
 * Set :setting:`LOCATION <CACHES-LOCATION>` to the URL pointing to your Redis
   instance, using the appropriate scheme. See the ``redis-py`` docs for
   `details on the available schemes
-  <https://redis-py.readthedocs.io/en/stable/#redis.ConnectionPool.from_url>`_.
+  <https://redis-py.readthedocs.io/en/stable/connections.html#redis.connection.ConnectionPool.from_url>`_.
 
 For example, if Redis is running on localhost (127.0.0.1) port 6379::
 
@@ -568,8 +568,8 @@ class`_ (``redis.ConnectionPool`` is used by default)::
         }
     }
 
-.. _`parser class`: https://github.com/andymccurdy/redis-py#parsers
-.. _`connection pool class`: https://github.com/andymccurdy/redis-py#connection-pools
+.. _`parser class`: https://github.com/redis/redis-py#parsers
+.. _`connection pool class`: https://github.com/redis/redis-py#connection-pools
 
 .. _the-per-site-cache: