diff --git a/EDMCLogging.py b/EDMCLogging.py
index 201648a2..a05ad107 100644
--- a/EDMCLogging.py
+++ b/EDMCLogging.py
@@ -193,7 +193,7 @@ class Logger:
         self.logger_channel_rotating.setFormatter(self.logger_formatter)
         self.logger.addHandler(self.logger_channel_rotating)
 
-    def get_logger(self) -> 'LoggerMixin':
+    def get_logger(self) -> LoggerMixin:
         """
         Obtain the self.logger of the class instance.
 
@@ -232,7 +232,7 @@ class Logger:
             logger.trace("Not changing log level because it's TRACE")  # type: ignore
 
 
-def get_plugin_logger(plugin_name: str, loglevel: int = _default_loglevel) -> 'LoggerMixin':
+def get_plugin_logger(plugin_name: str, loglevel: int = _default_loglevel) -> LoggerMixin:
     """
     Return a logger suitable for a plugin.
 
@@ -352,7 +352,7 @@ class EDMCContextFilter(logging.Filter):
             try:
                 args, _, _, value_dict = inspect.getargvalues(frame)
                 if len(args) and args[0] in ('self', 'cls'):
-                    frame_class: 'object' = value_dict[args[0]]
+                    frame_class: object = value_dict[args[0]]
 
                     if frame_class:
                         # See https://en.wikipedia.org/wiki/Name_mangling#Python for how name mangling works.
@@ -450,7 +450,7 @@ class EDMCContextFilter(logging.Filter):
         # Go up through stack frames until we find the first with a
         # type(f_locals.self) of logging.Logger.  This should be the start
         # of the frames internal to logging.
-        frame: 'FrameType' = getframe(0)
+        frame: FrameType = getframe(0)
         while frame:
             if isinstance(frame.f_locals.get('self'), logging.Logger):
                 frame = cast('FrameType', frame.f_back)  # Want to start on the next frame below
@@ -518,7 +518,7 @@ class EDMCContextFilter(logging.Filter):
         return module_name
 
 
-def get_main_logger(sublogger_name: str = '') -> 'LoggerMixin':
+def get_main_logger(sublogger_name: str = '') -> LoggerMixin:
     """Return the correct logger for how the program is being run."""
     if not os.getenv("EDMC_NO_UI"):
         # GUI app being run
@@ -537,4 +537,4 @@ base_logger_name = appcmdname if os.getenv('EDMC_NO_UI') else appname
 edmclogger = Logger(base_logger_name, loglevel=loglevel)
 for h in config_logger.handlers[:]:
     config_logger.removeHandler(h)
-logger: 'LoggerMixin' = edmclogger.get_logger()
+logger: LoggerMixin = edmclogger.get_logger()
diff --git a/EDMarketConnector.py b/EDMarketConnector.py
index 122a19dc..762afd41 100644
--- a/EDMarketConnector.py
+++ b/EDMarketConnector.py
@@ -54,7 +54,7 @@ if __name__ == '__main__':
         log_file_path.mkdir(exist_ok=True)
         log_file_path /= f'{appname}.log'
 
-        sys.stdout = sys.stderr = open(log_file_path, mode='wt', buffering=1)  # Do NOT use WITH here.
+        sys.stdout = sys.stderr = open(log_file_path, mode='w', buffering=1)  # Do NOT use WITH here.
     # TODO: Test: Make *sure* this redirect is working, else py2exe is going to cause an exit popup
 
 
@@ -216,7 +216,7 @@ if __name__ == '__main__':  # noqa: C901
 
     if args.capi_use_debug_access_token:
         import config as conf_module
-        with open(conf_module.config.app_dir_path / 'access_token.txt', 'r') as at:
+        with open(conf_module.config.app_dir_path / 'access_token.txt') as at:
             conf_module.capi_debug_access_token = at.readline().strip()
 
     level_to_set: int | None = None
@@ -476,7 +476,7 @@ class AppWindow:
         if sys.platform == 'win32' and not bool(config.get_int('no_systray')):
             from simplesystray import SysTrayIcon
 
-            def open_window(systray: 'SysTrayIcon', *args) -> None:
+            def open_window(systray: SysTrayIcon, *args) -> None:
                 self.w.deiconify()
 
             logfile_loc = pathlib.Path(config.app_dir_path / 'logs')
@@ -953,7 +953,7 @@ class AppWindow:
 
         self.cooldown()
 
-    def export_market_data(self, data: 'CAPIData') -> bool:  # noqa: CCR001
+    def export_market_data(self, data: CAPIData) -> bool:  # noqa: CCR001
         """
         Export CAPI market data.
 
@@ -1872,7 +1872,7 @@ class AppWindow:
             h.write(str(companion.session.capi_raw_data).encode(encoding='utf-8'))
 
     if sys.platform == 'win32':
-        def exit_tray(self, systray: 'SysTrayIcon') -> None:
+        def exit_tray(self, systray: SysTrayIcon) -> None:
             """Tray icon is shutting down."""
             exit_thread = threading.Thread(
                 target=self.onexit,
diff --git a/companion.py b/companion.py
index 19f12a14..2c920144 100644
--- a/companion.py
+++ b/companion.py
@@ -29,7 +29,8 @@ import webbrowser
 from email.utils import parsedate
 from pathlib import Path
 from queue import Queue
-from typing import TYPE_CHECKING, Any, Mapping, TypeVar
+from typing import TYPE_CHECKING, Any, TypeVar
+from collections.abc import Mapping
 import requests
 import config as conf_module
 import killswitch
@@ -69,7 +70,7 @@ class CAPIData(UserDict):
 
     def __init__(
             self,
-            data: str | dict[str, Any] | 'CAPIData' | None = None,
+            data: str | dict[str, Any] | CAPIData | None = None,
             source_host: str | None = None,
             source_endpoint: str | None = None,
             request_cmdr: str | None = None
@@ -1204,7 +1205,7 @@ def fixup(data: CAPIData) -> CAPIData:  # noqa: C901, CCR001 # Can't be usefully
             if not (config.app_dir_path / 'FDevIDs' / f).is_file():
                 logger.warning(f'FDevID file {f} not found! Generating output without these commodity name rewrites.')
                 continue
-            with open(config.app_dir_path / 'FDevIDs' / f, 'r') as csvfile:
+            with open(config.app_dir_path / 'FDevIDs' / f) as csvfile:
                 reader = csv.DictReader(csvfile)
 
                 for row in reader:
@@ -1325,7 +1326,7 @@ def index_possibly_sparse_list(data: Mapping[str, V] | list[V], key: int) -> V:
     if isinstance(data, list):
         return data[key]
 
-    if isinstance(data, (dict, dict)):
+    if isinstance(data, dict):
         return data[str(key)]
 
     raise ValueError(f'Unexpected data type {type(data)}')
diff --git a/config/__init__.py b/config/__init__.py
index 3fe9a255..3892f3c7 100644
--- a/config/__init__.py
+++ b/config/__init__.py
@@ -43,7 +43,8 @@ import sys
 import tomllib
 import tomli_w
 from time import gmtime
-from typing import Any, Callable, Type, TypeVar
+from typing import Any, TypeVar
+from collections.abc import Callable
 import semantic_version
 from constants import GITVERSION_FILE, applongname, appname
 
@@ -474,7 +475,7 @@ class Config:
     @staticmethod
     def _suppress_call(
         func: Callable[..., _T],
-        exceptions: Type[BaseException] | list[Type[BaseException]] = Exception,
+        exceptions: type[BaseException] | list[type[BaseException]] = Exception,
         *args: Any,
         **kwargs: Any,
     ) -> _T | None:
diff --git a/config/linux.py b/config/linux.py
index 1b5ac924..9fba0ef0 100644
--- a/config/linux.py
+++ b/config/linux.py
@@ -12,7 +12,7 @@ import sys
 from config import config_logger
 
 if sys.platform != "linux":
-    raise EnvironmentError("This file is for Linux only.")
+    raise OSError("This file is for Linux only.")
 
 
 import pathlib
diff --git a/config/windows.py b/config/windows.py
index 6789bc4e..0f01e681 100644
--- a/config/windows.py
+++ b/config/windows.py
@@ -21,7 +21,7 @@ if TYPE_CHECKING:
     from . import Config
 
 if sys.platform != "win32":
-    raise EnvironmentError("This file is for Windows only.")
+    raise OSError("This file is for Windows only.")
 
 REG_RESERVED_ALWAYS_ZERO = 0
 
diff --git a/debug_webserver.py b/debug_webserver.py
index c4be2be3..545e62bd 100644
--- a/debug_webserver.py
+++ b/debug_webserver.py
@@ -7,7 +7,8 @@ import pathlib
 import threading
 import zlib
 from http import server
-from typing import Any, Callable, Literal
+from typing import Any, Literal
+from collections.abc import Callable
 from urllib.parse import parse_qs
 from config import config
 from EDMCLogging import get_main_logger
diff --git a/edshipyard.py b/edshipyard.py
index f7bceb75..e1c14e23 100644
--- a/edshipyard.py
+++ b/edshipyard.py
@@ -189,7 +189,7 @@ def export(data, filename=None) -> None:  # noqa: C901, CCR001
             raise
 
     if filename:
-        with open(filename, 'wt') as h:
+        with open(filename, 'w') as h:
             h.write(string)
         return
 
@@ -206,5 +206,5 @@ def export(data, filename=None) -> None:  # noqa: C901, CCR001
     timestamp = time.strftime('%Y-%m-%dT%H.%M.%S', time.localtime(querytime))
     filename = pathlib.Path(config.get_str('outdir')) / f'{ship}.{timestamp}.txt'
 
-    with open(filename, 'wt') as h:
+    with open(filename, 'w') as h:
         h.write(string)
diff --git a/hotkey/linux.py b/hotkey/linux.py
index 7e4b9862..33e9cd7e 100644
--- a/hotkey/linux.py
+++ b/hotkey/linux.py
@@ -6,7 +6,7 @@ from EDMCLogging import get_main_logger
 from hotkey import AbstractHotkeyMgr
 
 if sys.platform != 'linux':
-    raise EnvironmentError("This file is for Linux only.")
+    raise OSError("This file is for Linux only.")
 
 logger = get_main_logger()
 
diff --git a/hotkey/windows.py b/hotkey/windows.py
index b292e7a7..9d32edaa 100644
--- a/hotkey/windows.py
+++ b/hotkey/windows.py
@@ -16,7 +16,7 @@ from EDMCLogging import get_main_logger
 from hotkey import AbstractHotkeyMgr
 
 if sys.platform != 'win32':
-    raise EnvironmentError("This file is for Windows only.")
+    raise OSError("This file is for Windows only.")
 
 logger = get_main_logger()
 
diff --git a/journal_lock.py b/journal_lock.py
index 3e16b309..8d90314e 100644
--- a/journal_lock.py
+++ b/journal_lock.py
@@ -13,7 +13,7 @@ import tkinter as tk
 from enum import Enum
 from os import getpid as os_getpid
 from tkinter import ttk
-from typing import Callable
+from collections.abc import Callable
 from l10n import translations as tr
 from config import config
 from EDMCLogging import get_main_logger
diff --git a/killswitch.py b/killswitch.py
index 22a40049..bec23ba8 100644
--- a/killswitch.py
+++ b/killswitch.py
@@ -11,9 +11,10 @@ import json
 import threading
 from copy import deepcopy
 from typing import (
-    TYPE_CHECKING, Any, Callable, Mapping, MutableMapping, MutableSequence, NamedTuple, Sequence,
+    TYPE_CHECKING, Any, NamedTuple,
     TypedDict, TypeVar, cast, Union
 )
+from collections.abc import Callable, Mapping, MutableMapping, MutableSequence, Sequence
 import requests
 import semantic_version
 from semantic_version.base import Version
@@ -217,7 +218,7 @@ class KillSwitchSet:
     def __init__(self, kill_switches: list[KillSwitches]) -> None:
         self.kill_switches = kill_switches
 
-    def get_disabled(self, id: str, *, version: Union[Version, str] = _current_version) -> DisabledResult:
+    def get_disabled(self, id: str, *, version: Version | str = _current_version) -> DisabledResult:
         """
         Return whether the given feature ID is disabled by a killswitch for the given version.
 
diff --git a/l10n.py b/l10n.py
index 57c8651b..48197592 100755
--- a/l10n.py
+++ b/l10n.py
@@ -16,7 +16,8 @@ import re
 import sys
 from contextlib import suppress
 from os import listdir, sep
-from typing import Iterable, TextIO, cast
+from typing import TextIO, cast
+from collections.abc import Iterable
 import pathlib
 from config import config
 from EDMCLogging import get_main_logger
diff --git a/loadout.py b/loadout.py
index 144439c0..c465cdbd 100644
--- a/loadout.py
+++ b/loadout.py
@@ -33,7 +33,7 @@ def export(data: companion.CAPIData, requested_filename: str | None = None) -> N
     )  # pretty print
 
     if requested_filename is not None and requested_filename:
-        with open(requested_filename, 'wt') as h:
+        with open(requested_filename, 'w') as h:
             h.write(string)
         return
     if not requested_filename:
@@ -45,7 +45,7 @@ def export(data: companion.CAPIData, requested_filename: str | None = None) -> N
     regexp = re.compile(re.escape(ship) + r'\.\d\d\d\d-\d\d-\d\dT\d\d\.\d\d\.\d\d\.txt')
     oldfiles = sorted([x for x in listdir(config.get_str('outdir')) if regexp.match(x)])
     if oldfiles:
-        with open(Path(config.get_str('outdir')) / Path(oldfiles[-1]), 'rU') as h:
+        with open(Path(config.get_str('outdir')) / Path(oldfiles[-1])) as h:
             if h.read() == string:
                 return  # same as last time - don't write
 
@@ -57,5 +57,5 @@ def export(data: companion.CAPIData, requested_filename: str | None = None) -> N
     ship_time = time.strftime('%Y-%m-%dT%H.%M.%S', time.localtime(query_time))
     file_path = output_directory / f"{ship}.{ship_time}.txt"
 
-    with open(file_path, 'wt') as h:
+    with open(file_path, 'w') as h:
         h.write(string)
diff --git a/monitor.py b/monitor.py
index 3df0f85c..c00cfbaf 100644
--- a/monitor.py
+++ b/monitor.py
@@ -18,7 +18,8 @@ from collections import defaultdict
 from os import SEEK_END, SEEK_SET, listdir
 from os.path import basename, expanduser, getctime, isdir, join
 from time import gmtime, localtime, mktime, sleep, strftime, strptime, time
-from typing import TYPE_CHECKING, Any, BinaryIO, MutableMapping
+from typing import TYPE_CHECKING, Any, BinaryIO
+from collections.abc import MutableMapping
 import psutil
 import semantic_version
 import util_ships
@@ -347,7 +348,7 @@ class EDLogs(FileSystemEventHandler):
         """
         return bool(self.thread and self.thread.is_alive())
 
-    def on_created(self, event: 'FileSystemEvent') -> None:
+    def on_created(self, event: FileSystemEvent) -> None:
         """Watchdog callback when, e.g. client (re)started."""
         if not event.is_directory and self._RE_LOGFILE.search(str(basename(event.src_path))):
 
@@ -2267,7 +2268,7 @@ class EDLogs(FileSystemEventHandler):
         string = json.dumps(self.ship(False), ensure_ascii=False, indent=2, separators=(',', ': '))  # pretty print
         if filename:
             try:
-                with open(filename, 'wt', encoding='utf-8') as h:
+                with open(filename, 'w', encoding='utf-8') as h:
                     h.write(string)
 
             except UnicodeError:
@@ -2276,7 +2277,7 @@ class EDLogs(FileSystemEventHandler):
                                  )
 
                 try:
-                    with open(filename, 'wt') as h:
+                    with open(filename, 'w') as h:
                         h.write(string)
 
                 except OSError:
@@ -2291,7 +2292,7 @@ class EDLogs(FileSystemEventHandler):
 
         ship = util_ships.ship_file_name(self.state['ShipName'], self.state['ShipType'])
         regexp = re.compile(re.escape(ship) + r'\.\d{4}-\d\d-\d\dT\d\d\.\d\d\.\d\d\.txt')
-        oldfiles = sorted((x for x in listdir(config.get_str('outdir')) if regexp.match(x)))
+        oldfiles = sorted(x for x in listdir(config.get_str('outdir')) if regexp.match(x))
         if oldfiles:
             try:
                 with open(join(config.get_str('outdir'), oldfiles[-1]), encoding='utf-8') as h:
@@ -2323,13 +2324,13 @@ class EDLogs(FileSystemEventHandler):
         filename = join(config.get_str('outdir'), f'{ship}.{ts}.txt')
 
         try:
-            with open(filename, 'wt', encoding='utf-8') as h:
+            with open(filename, 'w', encoding='utf-8') as h:
                 h.write(string)
 
         except UnicodeError:
             logger.exception("UnicodeError writing ship loadout to new filename with utf-8 encoding, trying without...")
             try:
-                with open(filename, 'wt') as h:
+                with open(filename, 'w') as h:
                     h.write(string)
 
             except OSError:
diff --git a/myNotebook.py b/myNotebook.py
index 119f33bb..c28d7873 100644
--- a/myNotebook.py
+++ b/myNotebook.py
@@ -14,7 +14,7 @@ import tkinter as tk
 from tkinter import ttk, messagebox
 from PIL import ImageGrab
 from l10n import translations as tr
-from typing import Callable
+from collections.abc import Callable
 
 if sys.platform == 'win32':
     PAGEFG = 'SystemWindowText'
diff --git a/outfitting.py b/outfitting.py
index 4b014e48..3256da31 100644
--- a/outfitting.py
+++ b/outfitting.py
@@ -296,7 +296,7 @@ def export(data, filename) -> None:
     header = 'System,Station,Category,Name,Mount,Guidance,Ship,Class,Rating,FDevID,Date\n'
     rowheader = f'{data["lastSystem"]["name"]},{data["lastStarport"]["name"]}'
 
-    with open(filename, 'wt') as h:
+    with open(filename, 'w') as h:
         h.write(header)
         for v in data["lastStarport"].get("modules", {}).values():
             try:
diff --git a/plug.py b/plug.py
index e573a218..77d73f9e 100644
--- a/plug.py
+++ b/plug.py
@@ -18,7 +18,8 @@ import tkinter as tk
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 from tkinter import ttk
-from typing import Any, Mapping, MutableMapping
+from typing import Any
+from collections.abc import Mapping, MutableMapping
 
 import companion
 import myNotebook as nb  # noqa: N813
diff --git a/plugins/common_coreutils.py b/plugins/common_coreutils.py
index a488de46..2e3b58ae 100644
--- a/plugins/common_coreutils.py
+++ b/plugins/common_coreutils.py
@@ -22,7 +22,8 @@ referenced in this file (or only in any other core plugin), and if so...
 # pylint: disable=import-error
 from __future__ import annotations
 
-from typing import Any, Mapping, cast
+from typing import Any, cast
+from collections.abc import Mapping
 import tkinter as tk
 import base64
 import gzip
diff --git a/plugins/coriolis.py b/plugins/coriolis.py
index 89f128f7..be0bd4be 100644
--- a/plugins/coriolis.py
+++ b/plugins/coriolis.py
@@ -22,7 +22,8 @@ referenced in this file (or only in any other core plugin), and if so...
 # pylint: disable=import-error
 from __future__ import annotations
 
-from typing import Any, Mapping
+from typing import Any
+from collections.abc import Mapping
 import tkinter as tk
 from tkinter import ttk
 import myNotebook as nb  # noqa: N813 # its not my fault.
diff --git a/plugins/eddn.py b/plugins/eddn.py
index 6410d0b2..8b783c8f 100644
--- a/plugins/eddn.py
+++ b/plugins/eddn.py
@@ -33,7 +33,8 @@ from tkinter import ttk
 from platform import system
 from textwrap import dedent
 from threading import Lock
-from typing import Any, Iterator, Mapping, MutableMapping
+from typing import Any
+from collections.abc import Iterator, Mapping, MutableMapping
 import requests
 import companion
 import edmc_data
@@ -152,7 +153,7 @@ class EDDNSender:
         r"unable to validate.',\)]$"
     )
 
-    def __init__(self, eddn: 'EDDN', eddn_endpoint: str) -> None:
+    def __init__(self, eddn: EDDN, eddn_endpoint: str) -> None:
         """
         Prepare the system for processing messages.
 
diff --git a/plugins/edsm.py b/plugins/edsm.py
index 902e248b..46c8ef4e 100644
--- a/plugins/edsm.py
+++ b/plugins/edsm.py
@@ -29,7 +29,8 @@ from queue import Queue
 from threading import Thread
 from time import sleep
 from tkinter import ttk
-from typing import Any, Literal, Mapping, MutableMapping, cast, Sequence
+from typing import Any, Literal, cast
+from collections.abc import Mapping, MutableMapping, Sequence
 import requests
 import killswitch
 import monitor
diff --git a/plugins/edsy.py b/plugins/edsy.py
index b1bdbaf1..109bb2f0 100644
--- a/plugins/edsy.py
+++ b/plugins/edsy.py
@@ -20,7 +20,8 @@ referenced in this file (or only in any other core plugin), and if so...
 """
 from __future__ import annotations
 
-from typing import Any, Mapping
+from typing import Any
+from collections.abc import Mapping
 from plugins.common_coreutils import shipyard_url_common  # pylint: disable=E0401
 
 
diff --git a/plugins/inara.py b/plugins/inara.py
index 56df1e0e..8fcf110c 100644
--- a/plugins/inara.py
+++ b/plugins/inara.py
@@ -31,7 +31,8 @@ from datetime import datetime, timedelta, timezone
 from operator import itemgetter
 from threading import Lock, Thread
 from tkinter import ttk
-from typing import Any, Callable, Deque, Mapping, NamedTuple, Sequence, cast, Union
+from typing import Any, Deque, NamedTuple, cast, Union
+from collections.abc import Callable, Mapping, Sequence
 import requests
 import edmc_data
 import killswitch
diff --git a/prefs.py b/prefs.py
index 65feb24b..9b82704a 100644
--- a/prefs.py
+++ b/prefs.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """EDMC preferences library."""
 from __future__ import annotations
 
@@ -14,7 +13,8 @@ from os import system
 from tkinter import colorchooser as tkColorChooser  # type: ignore # noqa: N812
 from tkinter import ttk
 from types import TracebackType
-from typing import Any, Callable, Optional, Type
+from typing import Any
+from collections.abc import Callable
 import myNotebook as nb  # noqa: N813
 import plug
 from config import appversion_nobuild, config
@@ -170,8 +170,8 @@ class AutoInc(contextlib.AbstractContextManager):
 
     def __exit__(
         self,
-        exc_type: Optional[Type[BaseException]], exc_value: Optional[BaseException], traceback: Optional[TracebackType]
-    ) -> Optional[bool]:
+        exc_type: type[BaseException] | None, exc_value: BaseException | None, traceback: TracebackType | None
+    ) -> bool | None:
         """Do nothing."""
         return None
 
@@ -241,7 +241,7 @@ if sys.platform == 'win32':
 class PreferencesDialog(tk.Toplevel):
     """The EDMC preferences dialog."""
 
-    def __init__(self, parent: tk.Tk, callback: Optional[Callable]):
+    def __init__(self, parent: tk.Tk, callback: Callable | None):
         super().__init__(parent)
 
         self.parent = parent
@@ -265,7 +265,7 @@ class PreferencesDialog(tk.Toplevel):
 
         self.cmdr: str | bool | None = False  # Note if Cmdr changes in the Journal
         self.is_beta: bool = False  # Note if Beta status changes in the Journal
-        self.cmdrchanged_alarm: Optional[str] = None  # This stores an ID that can be used to cancel a scheduled call
+        self.cmdrchanged_alarm: str | None = None  # This stores an ID that can be used to cancel a scheduled call
 
         # Set up the main frame
         frame = ttk.Frame(self)
@@ -1136,7 +1136,7 @@ class PreferencesDialog(tk.Toplevel):
         """Handle preferences active tab changing."""
         self.outvarchanged()
 
-    def outvarchanged(self, event: Optional[tk.Event] = None) -> None:
+    def outvarchanged(self, event: tk.Event | None = None) -> None:
         """Handle Output tab variable changes."""
         self.displaypath(self.outdir, self.outdir_entry)
         self.displaypath(self.logdir, self.logdir_entry)
@@ -1240,14 +1240,14 @@ class PreferencesDialog(tk.Toplevel):
         self.theme_button_0['state'] = state
         self.theme_button_1['state'] = state
 
-    def hotkeystart(self, event: 'tk.Event[Any]') -> None:
+    def hotkeystart(self, event: tk.Event[Any]) -> None:
         """Start listening for hotkeys."""
         event.widget.bind('<KeyPress>', self.hotkeylisten)
         event.widget.bind('<KeyRelease>', self.hotkeylisten)
         event.widget.delete(0, tk.END)
         hotkeymgr.acquire_start()
 
-    def hotkeyend(self, event: 'tk.Event[Any]') -> None:
+    def hotkeyend(self, event: tk.Event[Any]) -> None:
         """Stop listening for hotkeys."""
         event.widget.unbind('<KeyPress>')
         event.widget.unbind('<KeyRelease>')
@@ -1258,7 +1258,7 @@ class PreferencesDialog(tk.Toplevel):
             # LANG: No hotkey/shortcut set
             hotkeymgr.display(self.hotkey_code, self.hotkey_mods) if self.hotkey_code else tr.tl('None'))
 
-    def hotkeylisten(self, event: 'tk.Event[Any]') -> str:
+    def hotkeylisten(self, event: tk.Event[Any]) -> str:
         """
         Hotkey handler.
 
diff --git a/protocol.py b/protocol.py
index cec4333a..774a012e 100644
--- a/protocol.py
+++ b/protocol.py
@@ -12,7 +12,7 @@ import os
 import sys
 import threading
 from urllib import parse
-from typing import TYPE_CHECKING, Type
+from typing import TYPE_CHECKING
 from config import config
 from constants import appname, protocolhandler_redirect
 from EDMCLogging import get_main_logger
@@ -61,7 +61,7 @@ if config.auth_force_edmc_protocol or (  # noqa: C901
 ):
     # This could be false if you use auth_force_edmc_protocol, but then you get to keep the pieces
     if sys.platform != "win32":
-        raise EnvironmentError("This code is for Windows only.")
+        raise OSError("This code is for Windows only.")
     # spell-checker: words HBRUSH HICON WPARAM wstring WNDCLASS HMENU HGLOBAL
     from ctypes import (  # type: ignore
         windll,
@@ -434,7 +434,7 @@ else:  # Linux / Run from source
             )
 
 
-def get_handler_impl() -> Type[GenericProtocolHandler]:
+def get_handler_impl() -> type[GenericProtocolHandler]:
     """
     Get the appropriate GenericProtocolHandler for the current system and config.
 
diff --git a/scripts/find_localised_strings.py b/scripts/find_localised_strings.py
index 19a5efb6..02f928e3 100644
--- a/scripts/find_localised_strings.py
+++ b/scripts/find_localised_strings.py
@@ -188,7 +188,7 @@ class FileLocation:
     line_end_col: int | None
 
     @staticmethod
-    def from_call(path: pathlib.Path, c: ast.Call) -> "FileLocation":
+    def from_call(path: pathlib.Path, c: ast.Call) -> FileLocation:
         """
         Create a FileLocation from a Call and Path.
 
diff --git a/stats.py b/stats.py
index c16ec880..67fc9379 100644
--- a/stats.py
+++ b/stats.py
@@ -12,7 +12,8 @@ import json
 import sys
 import tkinter as tk
 from tkinter import ttk
-from typing import Any, AnyStr, Callable, NamedTuple, Sequence, cast
+from typing import Any, AnyStr, NamedTuple, cast
+from collections.abc import Callable, Sequence
 import companion
 import EDMCLogging
 import myNotebook as nb  # noqa: N813
diff --git a/td.py b/td.py
index 484e8d29..a5f0d6cd 100644
--- a/td.py
+++ b/td.py
@@ -30,18 +30,18 @@ def export(data: CAPIData) -> None:
     # required
     with open(data_path / data_filename, 'wb') as h:
         # Format described here: https://github.com/eyeonus/Trade-Dangerous/wiki/Price-Data
-        h.write('#! trade.py import -\n'.encode('utf-8'))
+        h.write(b'#! trade.py import -\n')
         this_platform = system()
         cmdr_name = data['commander']['name'].strip()
         h.write(
-            f'# Created by {applongname} {appversion()} on {this_platform} for Cmdr {cmdr_name}.\n'.encode('utf-8')
+            f'# Created by {applongname} {appversion()} on {this_platform} for Cmdr {cmdr_name}.\n'.encode()
         )
         h.write(
-            '#\n#    <item name>             <sellCR> <buyCR>   <demand>   <stock>  <timestamp>\n\n'.encode('utf-8')
+            b'#\n#    <item name>             <sellCR> <buyCR>   <demand>   <stock>  <timestamp>\n\n'
         )
         system_name = data['lastSystem']['name'].strip()
         starport_name = data['lastStarport']['name'].strip()
-        h.write(f'@ {system_name}/{starport_name}\n'.encode('utf-8'))
+        h.write(f'@ {system_name}/{starport_name}\n'.encode())
 
         # sort commodities by category
         by_category = defaultdict(list)
@@ -50,7 +50,7 @@ def export(data: CAPIData) -> None:
 
         timestamp = time.strftime('%Y-%m-%d %H:%M:%S', time.strptime(data['timestamp'], '%Y-%m-%dT%H:%M:%SZ'))
         for category in sorted(by_category):
-            h.write(f'   + {format(category)}\n'.encode('utf-8'))
+            h.write(f'   + {format(category)}\n'.encode())
             # corrections to commodity names can change the sort order
             for commodity in sorted(by_category[category], key=itemgetter('name')):
                 h.write(
@@ -61,5 +61,5 @@ def export(data: CAPIData) -> None:
                     f"{demandbracketmap[commodity['demandBracket']]:1}"
                     f" {int(commodity['stock']) if commodity['stockBracket'] else '':8}"
                     f"{stockbracketmap[commodity['stockBracket']]:1}"
-                    f"  {timestamp}\n".encode('utf-8')
+                    f"  {timestamp}\n".encode()
                 )
diff --git a/tests/journal_lock.py/test_journal_lock.py b/tests/journal_lock.py/test_journal_lock.py
index 649140c8..438d1dd5 100644
--- a/tests/journal_lock.py/test_journal_lock.py
+++ b/tests/journal_lock.py/test_journal_lock.py
@@ -5,7 +5,7 @@ import multiprocessing as mp
 import os
 import pathlib
 import sys
-from typing import Generator
+from collections.abc import Generator
 import pytest
 from pytest import MonkeyPatch, TempdirFactory, TempPathFactory
 from config import config
diff --git a/theme.py b/theme.py
index d4331291..fe431ebb 100644
--- a/theme.py
+++ b/theme.py
@@ -15,7 +15,7 @@ import sys
 import tkinter as tk
 from tkinter import font as tk_font
 from tkinter import ttk
-from typing import Callable
+from collections.abc import Callable
 from l10n import translations as tr
 from config import config
 from EDMCLogging import get_main_logger