diff --git a/docs/INTERNALS.md b/docs/INTERNALS.md
index 244d7c46c3..77d17e83a0 100644
--- a/docs/INTERNALS.md
+++ b/docs/INTERNALS.md
@@ -64,6 +64,19 @@ these or later versions:
 - perl           5.8 (2002-07-19), on Windows: 5.22 (2015-06-01)
 - Visual Studio  2010 10.0 (2010-04-12 - 2020-07-14)
 
+## Testing
+
+Certain tests require the following packages to operate. In some cases, tests
+that do not find the necessary requirements are automatically skipped.
+
+- OpenSSL        (see above)
+- nghttp2        (see above)
+- OpenSSH
+- perl           (see above)
+- pytest
+- Python         3.8 (2019-10-14)
+- stunnel
+
 ## Library Symbols
 
 All symbols used internally in libcurl must use a `Curl_` prefix if they are
diff --git a/scripts/pythonlint.sh b/scripts/pythonlint.sh
index a6d6aa2dd4..1385533064 100755
--- a/scripts/pythonlint.sh
+++ b/scripts/pythonlint.sh
@@ -29,9 +29,11 @@
 
 set -eu
 
-ruff check --extend-select=B007,B016,C405,C416,COM818,D200,D213,D204,D401,\
+ruff check --target-version=py38 \
+--extend-select=B007,B016,C405,C416,COM818,D200,D213,D204,D401,\
 D415,FURB129,N818,PERF401,PERF403,PIE790,PIE808,PLW0127,Q004,RUF010,SIM101,\
 SIM117,SIM118,TRY400,TRY401,RET503,RET504,UP004,B018,B904,RSE102,RET505,I001 \
+--ignore=FA100 \
 "$@"
 # Checks that are in preview only, since --preview otherwise turns them all on
-ruff check --preview --select=E301,E302,E303,E304,E305,E306,E502 "$@"
+ruff check --target-version=py38 --preview --select=E301,E302,E303,E304,E305,E306,E502 "$@"
diff --git a/tests/dictserver.py b/tests/dictserver.py
index 87a00d61d0..bff6e80157 100755
--- a/tests/dictserver.py
+++ b/tests/dictserver.py
@@ -25,8 +25,6 @@
 #
 """DICT server."""
 
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 import argparse
 import logging
 import os
diff --git a/tests/http/testenv/ports.py b/tests/http/testenv/ports.py
index 2436d40767..8f25daedca 100644
--- a/tests/http/testenv/ports.py
+++ b/tests/http/testenv/ports.py
@@ -25,8 +25,7 @@
 import logging
 import os
 import socket
-from collections.abc import Callable
-from typing import Dict
+from typing import Callable, Dict
 
 from filelock import FileLock
 
diff --git a/tests/negtelnetserver.py b/tests/negtelnetserver.py
index ad7cb53e98..8d074f5046 100755
--- a/tests/negtelnetserver.py
+++ b/tests/negtelnetserver.py
@@ -22,22 +22,15 @@
 #
 """A telnet server which negotiates."""
 
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 import argparse
 import logging
 import os
 import socket
+import socketserver
 import sys
 
 from util import ClosingFileHandler
 
-if sys.version_info.major >= 3:
-    import socketserver
-else:
-    import SocketServer as socketserver
-
-
 log = logging.getLogger(__name__)
 HOST = "localhost"
 IDENT = "NTEL"