diff --git a/pyproject.toml b/pyproject.toml
index 6f4ebd5..5e6ba06 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,23 +65,7 @@ indent-width = 4
 [tool.ruff.lint]
 fixable = ['ALL']
 ignore = [
-    'FA100', #Add `from __future__ import annotations` to simplify `typing.Optional`
-    'UP022', # Prefer `capture_output` over sending `stdout` and `stderr` to `PIPE`
-    'SIM115', # Use a context manager for opening files
     'UP031', #Use format specifiers instead of percent format
-    'C408', # Unnecessary `dict()` call (rewrite as a literal)
-    'C417' # Unnecessary `map()` usage (rewrite using a generator expression)
 ]
 
-# [tool.pylint]
-# max-line-length = 88
-# disable = [
-#     "C0103", # (invalid-name)
-#     "C0114", # (missing-module-docstring)
-#     "C0115", # (missing-class-docstring)
-#     "C0116", # (missing-function-docstring)
-#     "R0903", # (too-few-public-methods)
-#     "R0913", # (too-many-arguments)
-#     "W0105", # (pointless-string-statement)
-# ]
 
diff --git a/src/wavinfo/__main__.py b/src/wavinfo/__main__.py
index 43001a4..2a1f3d8 100644
--- a/src/wavinfo/__main__.py
+++ b/src/wavinfo/__main__.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import datetime
 import importlib.metadata
 import json
@@ -8,7 +10,6 @@ from cmd import Cmd
 from enum import Enum
 from optparse import OptionParser
 from shlex import split
-from typing import Dict, List, Union
 
 from . import WavInfoReader
 
@@ -30,8 +31,8 @@ class MissingDataError(RuntimeError):
 class MetaBrowser(Cmd):
     prompt = "(wavinfo) "
 
-    metadata: Union[List, Dict]
-    path: List[str]
+    metadata: list | dict
+    path: list[str]
 
     def preloop(self) -> None:
         self.path = []
@@ -39,7 +40,7 @@ class MetaBrowser(Cmd):
 
     @property
     def cwd(self):
-        root: List | Dict = self.metadata
+        root: list | dict = self.metadata
         for key in self.path:
             if isinstance(root, list):
                 root = root[int(key)]
diff --git a/src/wavinfo/rf64_parser.py b/src/wavinfo/rf64_parser.py
index 92d3937..c8d249e 100644
--- a/src/wavinfo/rf64_parser.py
+++ b/src/wavinfo/rf64_parser.py
@@ -1,14 +1,14 @@
-import struct
+from __future__ import annotations
 
-# from collections import namedtuple
-from typing import Dict, NamedTuple
+import struct
+from typing import NamedTuple
 
 from . import riff_parser
 
 
 class RF64Context(NamedTuple):
     sample_count: int
-    bigchunk_table: Dict[str, int]
+    bigchunk_table: dict[str, int]
 
 
 def parse_rf64(stream, signature=b"RF64") -> RF64Context:
diff --git a/src/wavinfo/riff_parser.py b/src/wavinfo/riff_parser.py
index ab317b3..08e5a3d 100644
--- a/src/wavinfo/riff_parser.py
+++ b/src/wavinfo/riff_parser.py
@@ -1,6 +1,7 @@
-# from optparse import Option
+from __future__ import annotations
+
 import struct
-from typing import List, NamedTuple, Optional, Union
+from typing import NamedTuple
 
 from .rf64_parser import RF64Context, parse_rf64
 
@@ -13,14 +14,14 @@ class WavInfoEOFError(EOFError):
 
 class ListChunkDescriptor(NamedTuple):
     signature: bytes
-    children: List[Union["ChunkDescriptor", "ListChunkDescriptor"]]
+    children: list[ChunkDescriptor | ListChunkDescriptor]
 
 
 class ChunkDescriptor(NamedTuple):
     ident: bytes
     start: int
     length: int
-    rf64_context: Optional[RF64Context]
+    rf64_context: RF64Context | None
 
     def read_data(self, from_stream) -> bytes:
         from_stream.seek(self.start)
diff --git a/src/wavinfo/wave_adm_reader.py b/src/wavinfo/wave_adm_reader.py
index a37db7f..aa3d3d4 100644
--- a/src/wavinfo/wave_adm_reader.py
+++ b/src/wavinfo/wave_adm_reader.py
@@ -1,11 +1,11 @@
 """
 ADM Reader
 """
+from __future__ import annotations
 
 from collections import namedtuple
 from io import BytesIO
 from struct import calcsize, unpack, unpack_from
-from typing import Optional
 
 from lxml import etree as ET
 
@@ -57,7 +57,7 @@ class WavADMReader:
         Read the ADM `audioProgramme` data structure and some of its reference
         properties.
         """
-        ret_dict = dict()
+        ret_dict = {}
 
         nsmap = self.axml.getroot().nsmap
 
@@ -71,7 +71,7 @@ class WavADMReader:
         ret_dict["contents"] = []
 
         for content_ref in program.findall("audioContentIDRef", namespaces=nsmap):
-            content_dict = dict()
+            content_dict = {}
             content_dict["content_id"] = cid = content_ref.text
             content = afext.find(
                 "audioContent[@audioContentID='%s']" % cid, namespaces=nsmap
@@ -80,7 +80,7 @@ class WavADMReader:
             content_dict["objects"] = []
 
             for object_ref in content.findall("audioObjectIDRef", namespaces=nsmap):
-                object_dict = dict()
+                object_dict = {}
                 object_dict["object_id"] = oid = object_ref.text
                 object = afext.find(
                     "audioObject[@audioObjectID='%s']" % oid, namespaces=nsmap
@@ -101,7 +101,7 @@ class WavADMReader:
 
         return ret_dict
 
-    def track_info(self, index) -> Optional[dict]:
+    def track_info(self, index) -> dict | None:
         """
         Information about a track in the WAV file.
 
@@ -206,7 +206,7 @@ class WavADMReader:
             rd.update(self.track_info(channel_uid_rec.track_index))
             return rd
 
-        return dict(
-            channel_entries=list(map(lambda z: make_entry(z), self.channel_uids)),
-            programme=self.programme(),
-        )
+        return {
+            'channel_entries': [make_entry(z) for z in self.channel_uids],
+            'programme': self.programme(),
+        }
diff --git a/src/wavinfo/wave_bext_reader.py b/src/wavinfo/wave_bext_reader.py
index 56e7112..7520b07 100644
--- a/src/wavinfo/wave_bext_reader.py
+++ b/src/wavinfo/wave_bext_reader.py
@@ -1,7 +1,8 @@
+from __future__ import annotations
+
 import struct
 
 # from .umid_parser import UMIDParser
-from typing import Optional
 
 
 class WavBextReader:
@@ -58,22 +59,22 @@ class WavBextReader:
 
         #: SMPTE 330M UMID of this audio file, 64 bytes are allocated though
         #: the UMID may only be 32 bytes long.
-        self.umid: Optional[bytes] = None
+        self.umid: bytes | None = None
 
         #: EBU R128 Integrated loudness, in LUFS.
-        self.loudness_value: Optional[float] = None
+        self.loudness_value: float | None = None
 
         #: EBU R128 Loudness range, in LUFS.
-        self.loudness_range: Optional[float] = None
+        self.loudness_range: float | None = None
 
         #: True peak level, in dBFS TP
-        self.max_true_peak: Optional[float] = None
+        self.max_true_peak: float | None = None
 
         #: EBU R128 Maximum momentary loudness, in LUFS
-        self.max_momentary_loudness: Optional[float] = None
+        self.max_momentary_loudness: float | None = None
 
         #: EBU R128 Maximum short-term loudness, in LUFS.
-        self.max_shortterm_loudness: Optional[float] = None
+        self.max_shortterm_loudness: float | None = None
 
         if self.version > 0:
             self.umid = unpacked[7]
diff --git a/src/wavinfo/wave_cues_reader.py b/src/wavinfo/wave_cues_reader.py
index fbe51b5..4938a39 100644
--- a/src/wavinfo/wave_cues_reader.py
+++ b/src/wavinfo/wave_cues_reader.py
@@ -8,9 +8,11 @@ IBM Corporation and Microsoft Corporation
 https://www.aelius.com/njh/wavemetatools/doc/riffmci.pdf
 """
 
+from __future__ import annotations
+
 from dataclasses import dataclass
 from struct import calcsize, unpack
-from typing import Any, Dict, Generator, List, NamedTuple, Optional, Tuple
+from typing import Any, Generator, NamedTuple
 
 from .riff_parser import ChunkDescriptor
 
@@ -120,7 +122,7 @@ class CueEntry(NamedTuple):
         return calcsize(cls.Format)
 
     @classmethod
-    def read(cls, data: bytes) -> "CueEntry":
+    def read(cls, data: bytes) -> CueEntry:
         assert len(data) == cls.format_size(), (
             f"cue data size incorrect, expected {calcsize(cls.Format)} "
             "found {len(data)}"
@@ -176,13 +178,15 @@ class RangeLabel(NamedTuple):
         parsed = unpack(leader_struct_fmt, data[0 : calcsize(leader_struct_fmt)])
         text_data = data[calcsize(leader_struct_fmt) :]
 
+        purpose_str = parsed[2].decode('ascii')
+
         if data[6] != 0:
             fallback_encoding = f"cp{data[6]}"
 
         return cls(
             name=parsed[0],
             length=parsed[1],
-            purpose=parsed[2],
+            purpose=purpose_str,
             country=parsed[3],
             language=parsed[4],
             dialect=parsed[5],
@@ -194,27 +198,27 @@ class RangeLabel(NamedTuple):
 @dataclass
 class WavCuesReader:
     #: Every ``cue`` entry in the file
-    cues: List[CueEntry]
+    cues: list[CueEntry]
 
     #: Every ``labl`` in the file
-    labels: List[LabelEntry]
+    labels: list[LabelEntry]
 
     #: Every ``ltxt`` in the file
-    ranges: List[RangeLabel]
+    ranges: list[RangeLabel]
 
     #: Every ``note`` in the file
-    notes: List[NoteEntry]
+    notes: list[NoteEntry]
 
     @classmethod
     def read_all(
         cls,
         f,
-        cues: Optional[ChunkDescriptor],
-        labls: List[ChunkDescriptor],
-        ltxts: List[ChunkDescriptor],
-        notes: List[ChunkDescriptor],
+        cues: ChunkDescriptor | None,
+        labls: list[ChunkDescriptor],
+        ltxts: list[ChunkDescriptor],
+        notes: list[ChunkDescriptor],
         fallback_encoding: str,
-    ) -> "WavCuesReader":
+    ) -> WavCuesReader:
         cue_list = []
         if cues is not None:
             cues_data = cues.read_data(f)
@@ -249,7 +253,7 @@ class WavCuesReader:
             cues=cue_list, labels=label_list, ranges=range_list, notes=note_list
         )
 
-    def each_cue(self) -> Generator[Tuple[int, int], None, None]:
+    def each_cue(self) -> Generator[tuple[int, int], None, None]:
         """
         Iterate through each cue.
 
@@ -258,7 +262,7 @@ class WavCuesReader:
         for cue in self.cues:
             yield (cue.name, cue.sample_offset)
 
-    def label_and_note(self, cue_ident: int) -> Tuple[Optional[str], Optional[str]]:
+    def label_and_note(self, cue_ident: int) -> tuple[str | None, str | None]:
         """
         Get the label and note (extended comment) for a cue.
 
@@ -272,7 +276,7 @@ class WavCuesReader:
         note = next((n.text for n in self.notes if n.name == cue_ident), None)
         return (label, note)
 
-    def range(self, cue_ident: int) -> Optional[int]:
+    def range(self, cue_ident: int) -> int | None:
         """
         Get the length of the time range for a cue, if it has one.
 
@@ -281,11 +285,11 @@ class WavCuesReader:
         """
         return next((r.length for r in self.ranges if r.name == cue_ident), None)
 
-    def to_dict(self) -> Dict[str, Any]:
-        retval = dict()
+    def to_dict(self) -> dict[str, Any]:
+        retval = {}
 
         for n, t in self.each_cue():
-            retval[n] = dict()
+            retval[n] = {}
             retval[n]["frame"] = t
             label, note = self.label_and_note(n)
             r = self.range(n)
diff --git a/src/wavinfo/wave_dbmd_reader.py b/src/wavinfo/wave_dbmd_reader.py
index a25563f..2cb473a 100644
--- a/src/wavinfo/wave_dbmd_reader.py
+++ b/src/wavinfo/wave_dbmd_reader.py
@@ -7,11 +7,13 @@ Unless otherwise stated, all § references here are to
 .. _EBU Tech 3285 Supplement 6: https://tech.ebu.ch/docs/tech/tech3285s6.pdf
 """
 
+from __future__ import annotations
+
 from dataclasses import asdict, dataclass
 from enum import Enum, IntEnum
 from io import BytesIO
 from struct import unpack
-from typing import Any, List, Tuple, Union
+from typing import Any
 
 
 class SegmentType(IntEnum):
@@ -339,8 +341,10 @@ class DolbyDigitalPlusMetadata:
 
     @staticmethod
     def load(buffer: bytes):
-        assert len(buffer) == 96, "Dolby Digital Plus segment incorrect size, "
-        "expected 96 got %i" % len(buffer)
+        assert len(buffer) == 96, (
+            "Dolby Digital Plus segment incorrect size, "
+            "expected 96 got %i" % len(buffer)
+        )
 
         def program_id(b) -> int:
             return b
@@ -409,7 +413,7 @@ class DolbyDigitalPlusMetadata:
             return DolbyDigitalPlusMetadata.RFCompressionProfile(b)
 
         def dynrng1(b):
-            DolbyDigitalPlusMetadata.RFCompressionProfile(b)
+            return DolbyDigitalPlusMetadata.RFCompressionProfile(b)
 
         def ddplus_reserved3(_):
             pass
@@ -504,7 +508,7 @@ class DolbyAtmosMetadata:
         NOT_INDICATED = 0x04
 
     tool_name: str
-    tool_version: Tuple[int, int, int]
+    tool_version: tuple[int, int, int]
     warp_mode: WarpMode
 
     SEGMENT_LENGTH = 248
@@ -555,8 +559,8 @@ class DolbyAtmosSupplementalMetadata:
         NOT_INDICATED = 0x04
 
     object_count: int
-    render_modes: List["DolbyAtmosSupplementalMetadata.BinauralRenderMode"]
-    trim_modes: List[int]
+    render_modes: list[DolbyAtmosSupplementalMetadata.BinauralRenderMode]
+    trim_modes: list[int]
 
     MAGIC = 0xF8726FBD
     TRIM_CONFIG_COUNT = 9
@@ -603,9 +607,9 @@ class WavDolbyMetadataReader:
     #: indicating if the segment's checksum was valid, and the
     #: segment's parsed dataclass (or a `bytes` array if it was
     #: not recognized).
-    segment_list: List[Tuple[Union[SegmentType, int], bool, Any]]
+    segment_list: list[tuple[SegmentType | int, bool, Any]]
 
-    version: Tuple[int, int, int, int]
+    version: tuple[int, int, int, int]
 
     @staticmethod
     def segment_checksum(bs: bytes, size: int):
@@ -654,7 +658,7 @@ class WavDolbyMetadataReader:
                     (stype, checksum == expected_checksum, segment)
                 )
 
-    def dolby_digital_plus(self) -> List[DolbyDigitalPlusMetadata]:
+    def dolby_digital_plus(self) -> list[DolbyDigitalPlusMetadata]:
         """
         Every valid Dolby Digital Plus metadata segment in the file.
         """
@@ -664,7 +668,7 @@ class WavDolbyMetadataReader:
             if x[0] == SegmentType.DolbyDigitalPlus and x[1]
         ]
 
-    def dolby_atmos(self) -> List[DolbyAtmosMetadata]:
+    def dolby_atmos(self) -> list[DolbyAtmosMetadata]:
         """
         Every valid Dolby Atmos metadata segment in the file.
         """
@@ -672,7 +676,7 @@ class WavDolbyMetadataReader:
             x[2] for x in self.segment_list if x[0] == SegmentType.DolbyAtmos and x[1]
         ]
 
-    def dolby_atmos_supplemental(self) -> List[DolbyAtmosSupplementalMetadata]:
+    def dolby_atmos_supplemental(self) -> list[DolbyAtmosSupplementalMetadata]:
         """
         Every valid Dolby Atmos Supplemental metadata segment in the file.
         """
@@ -683,8 +687,8 @@ class WavDolbyMetadataReader:
         ]
 
     def to_dict(self) -> dict:
-        ddp = map(lambda x: asdict(x), self.dolby_digital_plus())
-        atmos = map(lambda x: asdict(x), self.dolby_atmos())
+        ddp = [asdict(x) for x in self.dolby_digital_plus()]
+        atmos = [asdict(x) for x in self.dolby_atmos()]
         # atmos_sup = map(lambda x: asdict(x), self.dolby_atmos_supplemental())
 
-        return dict(dolby_digital_plus=list(ddp), dolby_atmos=list(atmos))
+        return {"dolby_digital_plus": ddp, "dolby_atmos": atmos}
diff --git a/src/wavinfo/wave_info_reader.py b/src/wavinfo/wave_info_reader.py
index 9a9679d..b8a22ee 100644
--- a/src/wavinfo/wave_info_reader.py
+++ b/src/wavinfo/wave_info_reader.py
@@ -1,4 +1,4 @@
-from typing import Optional
+from __future__ import annotations
 
 from .riff_parser import ListChunkDescriptor, parse_chunk
 
@@ -22,40 +22,40 @@ class WavInfoChunkReader:
         )
 
         #: 'ICOP' Copyright
-        self.copyright: Optional[str] = self._get_field(f, b"ICOP")
+        self.copyright: str | None = self._get_field(f, b"ICOP")
         #: 'IPRD' Product
-        self.product: Optional[str] = self._get_field(f, b"IPRD")
-        self.album: Optional[str] = self.product
+        self.product: str | None = self._get_field(f, b"IPRD")
+        self.album: str | None = self.product
         #: 'IGNR' Genre
-        self.genre: Optional[str] = self._get_field(f, b"IGNR")
+        self.genre: str | None = self._get_field(f, b"IGNR")
         #: 'ISBJ' Subject
-        self.subject: Optional[str] = self._get_field(f, b"ISBJ")
+        self.subject: str | None = self._get_field(f, b"ISBJ")
         #: 'IART' Artist, composer, author
-        self.artist: Optional[str] = self._get_field(f, b"IART")
+        self.artist: str | None = self._get_field(f, b"IART")
         #: 'ICMT' Comment
-        self.comment: Optional[str] = self._get_field(f, b"ICMT")
+        self.comment: str | None = self._get_field(f, b"ICMT")
         #: 'ISFT' Software, encoding application
-        self.software: Optional[str] = self._get_field(f, b"ISFT")
+        self.software: str | None = self._get_field(f, b"ISFT")
         #: 'ICRD' Created date
-        self.created_date: Optional[str] = self._get_field(f, b"ICRD")
+        self.created_date: str | None = self._get_field(f, b"ICRD")
         #: 'IENG' Engineer
-        self.engineer: Optional[str] = self._get_field(f, b"IENG")
+        self.engineer: str | None = self._get_field(f, b"IENG")
         #: 'ITCH' Technician
-        self.technician: Optional[str] = self._get_field(f, b"ITCH")
+        self.technician: str | None = self._get_field(f, b"ITCH")
         #: 'IKEY' Keywords, keyword list
-        self.keywords: Optional[str] = self._get_field(f, b"IKEY")
+        self.keywords: str | None = self._get_field(f, b"IKEY")
         #: 'INAM' Name, title
-        self.title: Optional[str] = self._get_field(f, b"INAM")
+        self.title: str | None = self._get_field(f, b"INAM")
         #: 'ISRC' Source
-        self.source: Optional[str] = self._get_field(f, b"ISRC")
+        self.source: str | None = self._get_field(f, b"ISRC")
         #: 'TAPE' Tape
-        self.tape: Optional[str] = self._get_field(f, b"TAPE")
+        self.tape: str | None = self._get_field(f, b"TAPE")
         #: 'IARL' Archival Location
-        self.archival_location: Optional[str] = self._get_field(f, b"IARL")
+        self.archival_location: str | None = self._get_field(f, b"IARL")
         #: 'ICSM' Commissioned
-        self.commissioned: Optional[str] = self._get_field(f, b"ICMS")
+        self.commissioned: str | None = self._get_field(f, b"ICMS")
 
-    def _get_field(self, f, field_ident) -> Optional[str]:
+    def _get_field(self, f, field_ident) -> str | None:
         search = next(
             (
                 (chunk.start, chunk.length)
diff --git a/tests/test_rf64.py b/tests/test_rf64.py
index abca12e..9046ea8 100644
--- a/tests/test_rf64.py
+++ b/tests/test_rf64.py
@@ -15,8 +15,6 @@ class TestRf64(TestCase):
 
     def test_open(self):
         for path in glob("tests/test_files/rf64/*.wav.gz"):
-            gz = gzip.open(path)
-            wav_info = wavinfo.WavInfoReader(gz)
-
-            self.assertIsNotNone(wav_info)
-            # self.assertIsNotNone(wav_info.bext)
+            with gzip.open(path) as gz:
+                wav_info = wavinfo.WavInfoReader(gz)
+                self.assertIsNotNone(wav_info)
diff --git a/tests/utils.py b/tests/utils.py
index 0e0f847..e08eff0 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,14 +1,13 @@
 import json
 import os.path
 import subprocess
-from subprocess import PIPE
 
 FFPROBE = "ffprobe"
 
 
 def ffprobe(path):
     arguments = [FFPROBE, "-of", "json", "-show_format", "-show_streams", path]
-    process = subprocess.run(arguments, stdin=None, stdout=PIPE, stderr=PIPE, check=True)
+    process = subprocess.run(arguments, check=True, capture_output=True)
     if process.returncode == 0:
         output_str = process.stdout.decode("utf-8")
         return json.loads(output_str)