diff --git a/README.md b/README.md
index ad437bba..af3cd910 100644
--- a/README.md
+++ b/README.md
@@ -325,7 +325,7 @@ Notable libraries and software used:
  * [django-sass](https://github.com/coderedcorp/django-sass/)
  * The container bundles with `s6-init` and `nginx`
 
-See the [Pipefile](https://github.com/meeb/tubesync/blob/main/Pipfile) for a full list.
+See the [Pipfile](https://github.com/meeb/tubesync/blob/main/Pipfile) for a full list.
 
 ### Can I get access to the full Django admin?
 
@@ -353,7 +353,12 @@ etc.). Configuration of this is beyond the scope of this README.
 
 ### What architectures does the container support?
 
-Just `amd64` for the moment. Others may be made available if there is demand.
+Only two are supported, for the moment:
+- `amd64` (most desktop PCs and servers)
+-  `arm64`
+(modern ARM computers, such as the Rasperry Pi 3 or later)
+
+Others may be made available, if there is demand.
 
 ### The pipenv install fails with "Locking failed"!
 
diff --git a/tubesync/sync/views.py b/tubesync/sync/views.py
index 52090042..8ca853de 100644
--- a/tubesync/sync/views.py
+++ b/tubesync/sync/views.py
@@ -193,10 +193,15 @@ class ValidateSourceView(FormView):
         Source.SOURCE_TYPE_YOUTUBE_PLAYLIST: ('https://www.youtube.com/playlist?list='
                                               'PL590L5WQmH8dpP0RyH5pCfIaDEdt9nk7r')
     }
+    _youtube_domains = frozenset({
+        'youtube.com',
+        'm.youtube.com',
+        'www.youtube.com',
+    })
     validation_urls = {
         Source.SOURCE_TYPE_YOUTUBE_CHANNEL: {
             'scheme': 'https',
-            'domains': ('m.youtube.com', 'www.youtube.com'),
+            'domains': _youtube_domains,
             'path_regex': '^\/(c\/)?([^\/]+)(\/videos)?$',
             'path_must_not_match': ('/playlist', '/c/playlist'),
             'qs_args': [],
@@ -205,7 +210,7 @@ class ValidateSourceView(FormView):
         },
         Source.SOURCE_TYPE_YOUTUBE_CHANNEL_ID: {
             'scheme': 'https',
-            'domains': ('m.youtube.com', 'www.youtube.com'),
+            'domains': _youtube_domains,
             'path_regex': '^\/channel\/([^\/]+)(\/videos)?$',
             'path_must_not_match': ('/playlist', '/c/playlist'),
             'qs_args': [],
@@ -214,7 +219,7 @@ class ValidateSourceView(FormView):
         },
         Source.SOURCE_TYPE_YOUTUBE_PLAYLIST: {
             'scheme': 'https',
-            'domains': ('m.youtube.com', 'www.youtube.com'),
+            'domains': _youtube_domains,
             'path_regex': '^\/(playlist|watch)$',
             'path_must_not_match': (),
             'qs_args': ('list',),
diff --git a/tubesync/tubesync/wsgi.py b/tubesync/tubesync/wsgi.py
index 71c61003..74912aef 100644
--- a/tubesync/tubesync/wsgi.py
+++ b/tubesync/tubesync/wsgi.py
@@ -1,5 +1,4 @@
 import os
-from urllib.parse import urljoin
 from django.core.wsgi import get_wsgi_application
 
 
@@ -16,10 +15,9 @@ def application(environ, start_response):
         else:
             raise Exception(f'DJANGO_URL_PREFIX must end with a /, '
                             f'got: {DJANGO_URL_PREFIX}')
-    if script_name:
-        static_url = urljoin(script_name, 'static/')
+    if script_name is not None:
         environ['SCRIPT_NAME'] = script_name
         path_info = environ['PATH_INFO']
-        if path_info.startswith(script_name) and not path_info.startswith(static_url):
+        if path_info.startswith(script_name):
             environ['PATH_INFO'] = path_info[len(script_name) - 1:]
     return _application(environ, start_response)
diff --git a/tubesync/upgrade_yt-dlp.sh b/tubesync/upgrade_yt-dlp.sh
new file mode 100755
index 00000000..9da6d555
--- /dev/null
+++ b/tubesync/upgrade_yt-dlp.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+warning_message() {
+    cat <<EOM
+Please report any issues that you have encountered before updating yt-dlp.
+
+This is a tool to assist developers with debugging YouTube issues.
+It should not be used as an alternative to updating container images!
+EOM
+} 1>&2
+
+pip3() {
+    local pip_runner pip_whl run_whl
+
+    # pipenv
+    pip_runner='/usr/lib/python3/dist-packages/pipenv/patched/pip/__pip-runner__.py'
+    test -s "${pip_runner}" || pip_runner=''
+
+    # python3-pip-whl
+    pip_whl="$(ls -1r /usr/share/python-wheels/pip-*-py3-none-any.whl | head -n 1)"
+    run_whl="${pip_whl}/pip"
+
+    python3 "${pip_runner:-"${run_whl}"}" "$@"
+}
+
+warning_message
+test -n "${TUBESYNC_DEBUG}" || exit 1
+
+# Use the flag added in 23.0.1, if possible.
+# https://github.com/pypa/pip/pull/11780
+break_system_packages='--break-system-packages'
+pip_version="$(pip3 --version | awk '$1 = "pip" { print $2; exit; }')"
+if [[ "${pip_version}" < "23.0.1" ]]; then
+    break_system_packages=''
+fi
+
+pip3 install --upgrade ${break_system_packages} yt-dlp
+