diff --git a/multizone.py b/multizone.py
index 9973e43..1002c8a 100755
--- a/multizone.py
+++ b/multizone.py
@@ -12,9 +12,10 @@
 
 import argparse
 import sys
+import zoneinfo
 from datetime import datetime, timedelta, tzinfo
 from pathlib import Path
-from typing import Any, Dict
+from typing import Any
 
 import tabulate
 import tzlocal
@@ -22,10 +23,6 @@
 from babel.dates import format_datetime
 from termcolor import colored
 
-if sys.version_info < (3, 9):
-    from backports import zoneinfo
-else:
-    import zoneinfo
 if sys.version_info < (3, 10):
     from xdg import xdg_config_home
 else:
@@ -35,7 +32,7 @@
 else:
     import tomllib
 
-ConfigType = Dict[str, Any]
+ConfigType = dict[str, Any]
 
 
 def get_arg(time_str: str, sep: str) -> list[int]:
diff --git a/pyproject.toml b/pyproject.toml
index fe6cfbf..dc2c828 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,15 +53,17 @@ max-line-length = "108"
 disable = "R0912,R0914"
 
 [tool.ruff]
+line-length = 108
+target-version = "py39"
+
+[tool.ruff.lint]
 fixable = ["D", "I", "COM"]
 ignore = [
   "S101",  # assert
   "D213",  # multi-line-summary-second-line incompatible with multi-line-summary-first-line
   "D203"  # one-blank-line-before-class" incompatible with no-blank-line-before-class
 ]
-line-length = 108
 select = ["ALL"]
-target-version = "py39"
 
 [tool.ruff.per-file-ignores]
 "test_mz.py" = ["PLR2004"]
diff --git a/test_mz.py b/test_mz.py
index bb8f6c2..f92d724 100755
--- a/test_mz.py
+++ b/test_mz.py
@@ -12,17 +12,13 @@
 from datetime import datetime
 from pathlib import Path
 from unittest.mock import MagicMock, mock_open, patch
+from zoneinfo import ZoneInfo
 
 import pytest
 from babel.core import default_locale
 
 import multizone
 
-if sys.version_info < (3, 9):
-    from backports.zoneinfo import ZoneInfo
-else:
-    from zoneinfo import ZoneInfo
-
 
 def test_parse_time_args() -> None:
     """Tests parse_time_args()."""