diff --git a/ffconv/args.py b/ffconv/args.py
index fe5653a..c3df227 100644
--- a/ffconv/args.py
+++ b/ffconv/args.py
@@ -3,8 +3,8 @@
 import click
 
 from ffconv.helper import (
-    read_json,
     files_in_dir,
+    read_json,
     replace_conflicting_characters_in_filename,
 )
 
@@ -86,8 +86,8 @@ def __call__(self, ctx, param, value):
             if p.suffix:
                 if not p.parent.is_dir():
                     raise FileNotFoundError(
-                        f"The parent directory `{str(p.parent)}` "
-                        f"for output argument `{str(p)}` does not exist."
+                        f"The parent directory `{p.parent!s}` "
+                        f"for output argument `{p!s}` does not exist."
                     )
                 else:
                     current_batch = {
diff --git a/ffconv/cli.py b/ffconv/cli.py
index c40cf74..3813faa 100644
--- a/ffconv/cli.py
+++ b/ffconv/cli.py
@@ -3,27 +3,27 @@
 from pathlib import Path
 
 import click
+from loguru import logger
 from rich.prompt import IntPrompt
 
 from ffconv.args import (
+    AutoAudioFlagChecker,
     InputPathChecker,
-    OutputPathChecker,
-    PresetPathChecker,
     OptionalValueChecker,
+    OutputPathChecker,
     PresetOptionalChecker,
-    AutoAudioFlagChecker,
+    PresetPathChecker,
 )
 from ffconv.exception import StreamOrderError, StreamTypeMissingError
 from ffconv.helper import (
-    split_list_of_dicts_by_key,
     combine_arguments_by_batch,
-    remove_empty_dict_values,
     dict_to_list,
     preprocess_streams,
+    remove_empty_dict_values,
+    split_list_of_dicts_by_key,
 )
 from ffconv.process import ProcessCommand
 from ffconv.table import table_print_stream_options
-from loguru import logger  # noqa
 
 
 def validate_stream_order(mkvmerge_identify_result, file_details):
@@ -116,21 +116,9 @@ def stream_user_input(mkvmerge_identify_result):
                 {
                     "id": cs["id"],
                     "codec": cs["properties"]["codec_id"],
-                    "language": (
-                        cs["properties"]["language"]
-                        if "language" in cs["properties"]
-                        else "n/a"
-                    ),
-                    "title": (
-                        cs["properties"]["track_name"]
-                        if "track_name" in cs["properties"]
-                        else "n/a"
-                    ),
-                    "default": (
-                        cs["properties"]["default_track"]
-                        if "default_track" in cs["properties"]
-                        else "n/a"
-                    ),
+                    "language": cs["properties"].get("language", "n/a"),
+                    "title": cs["properties"].get("track_name", "n/a"),
+                    "default": cs["properties"].get("default_track", "n/a"),
                 }
                 for cs in stream_info["streams"]
             ]
@@ -302,7 +290,7 @@ def ffmpeg_convert_file(
     audio_map_index = "0:" + str(stream_mapping["audio"]["id"])
 
     # Filter complex subtitle map requires this escaped monstrosity for Windows
-    lit_file = str(input_file).replace("\\", "\\\\").replace(":", "\:")
+    lit_file = str(input_file).replace("\\", "\\\\").replace(":", r"\:")
     filter_complex_map = (
         "subtitles='" + lit_file + "':si=" + str(stream_mapping["subtitles"]["id"]),
     )
@@ -326,7 +314,7 @@ def ffmpeg_convert_file(
     filter_complex_map_concat = ",".join(filter_complex_map)
     filter_complex_map_complete = f"[{video_map_index}]{filter_complex_map_concat}"
 
-    current_datetime = datetime.now()
+    current_datetime = datetime.now().astimezone()
     metadata_encoded_date = (
         f'comment=Encoded on {current_datetime.strftime("%Y-%m-%d %H:%M:%S")}'
     )
@@ -467,7 +455,7 @@ def cli(
         for current_file_path_index, current_file_path in enumerate(
             current_input_files
         ):
-            mkvmerge_identify_result, mapping = mkvmerge_identify_streams(
+            _mkvmerge_identify_result, mapping = mkvmerge_identify_streams(
                 current_file_path,
                 total_current_input_files,
                 current_file_path_index,
diff --git a/ffconv/helper.py b/ffconv/helper.py
index 2d6343c..4a05b0a 100644
--- a/ffconv/helper.py
+++ b/ffconv/helper.py
@@ -6,7 +6,7 @@
 from pathlib import Path
 
 
-def files_in_dir(path: Path, file_types=["*.mkv"]):
+def files_in_dir(path: Path, file_types=None):
     """
     Returns a list of files in the given directory that match the specified file types.
 
@@ -18,6 +18,9 @@ def files_in_dir(path: Path, file_types=["*.mkv"]):
         List[Path]: A list of paths to the files in the directory that match the specified file types.
     """
 
+    if file_types is None:
+        file_types = ["*.mkv"]
+
     file_list = [
         f
         for f in path.rglob("*")
diff --git a/ffconv/process.py b/ffconv/process.py
index 920db94..a0ca24b 100644
--- a/ffconv/process.py
+++ b/ffconv/process.py
@@ -1,6 +1,6 @@
 import subprocess as sp
 
-from ffconv.exception import MKVmergeError, ProcessError, FFmpegError
+from ffconv.exception import FFmpegError, MKVmergeError, ProcessError
 
 
 class ProcessCommand:
@@ -43,7 +43,7 @@ def run(self, process, command):
             f"The following {process} command will be executed: {' '.join(command)}"
         )
 
-        response = sp.run(command, stdout=sp.PIPE, stderr=sp.PIPE)
+        response = sp.run(command, capture_output=True, check=False)
         return_code = response.returncode
         if return_code == 0:
             self.logger.info(f"{process} completed.")
diff --git a/ffconv/table.py b/ffconv/table.py
index eaa5364..0576efe 100644
--- a/ffconv/table.py
+++ b/ffconv/table.py
@@ -18,7 +18,7 @@ def table_print_stream_options(tracks: list) -> None:
     table = Table(show_header=True, header_style="bold cyan")
 
     # Header
-    for key in tracks[0].keys():
+    for key in tracks[0]:
         table.add_column(key.capitalize())
 
     # Rows
diff --git a/requirements.dev.txt b/requirements.dev.txt
index b0c07a1..cd474af 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,3 +1,3 @@
-ruff==0.15.20
+ruff==0.16.4
 mypy==2.3.1
 black==26.5.1
diff --git a/setup.py b/setup.py
index 83825d9..3e343c0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,7 @@
-from setuptools import setup, find_packages  # type: ignore
 import os
 
+from setuptools import find_packages, setup  # type: ignore
+
 VERSION = "3.0.0"