diff --git a/src/tap/tap.py b/src/tap/tap.py
index 2735a43..c2087bb 100644
--- a/src/tap/tap.py
+++ b/src/tap/tap.py
@@ -8,7 +8,7 @@
 from pprint import pformat
 from shlex import quote, split
 from types import MethodType
-from typing import Any, Callable, Dict, List, Optional, Sequence, Set, Tuple, TypeVar, Union, get_type_hints
+from typing import Any, Callable, List, Optional, Sequence, Set, Tuple, TypeVar, Union, get_type_hints
 from typing_inspect import is_literal_type
 
 from tap.utils import (
@@ -53,9 +53,9 @@ def __init__(
         *args,
         underscores_to_dashes: bool = False,
         explicit_bool: bool = False,
-        config_files: Optional[List[PathLike]] = None,
+        config_files: Optional[list[PathLike]] = None,
         **kwargs,
-    ):
+    ) -> None:
         """Initializes the Tap instance.
 
         :param args: Arguments passed to the super class ArgumentParser.
@@ -88,7 +88,7 @@ def __init__(
         self.argument_buffer = {}
 
         # Create a place to put the subparsers
-        self._subparser_buffer: List[Tuple[str, type, Dict[str, Any]]] = []
+        self._subparser_buffer: list[tuple[str, type, dict[str, Any]]] = []
 
         # Get class variables help strings from the comments
         self.class_variables = self._get_class_variables()
@@ -369,7 +369,7 @@ def configure(self) -> None:
         pass
 
     @staticmethod
-    def get_reproducibility_info(repo_path: Optional[PathLike] = None) -> Dict[str, str]:
+    def get_reproducibility_info(repo_path: Optional[PathLike] = None) -> dict[str, str]:
         """Gets a dictionary of reproducibility information.
 
         Reproducibility information always includes:
@@ -405,7 +405,7 @@ def get_reproducibility_info(repo_path: Optional[PathLike] = None) -> Dict[str,
 
         return reproducibility
 
-    def _log_all(self, repo_path: Optional[PathLike] = None) -> Dict[str, Any]:
+    def _log_all(self, repo_path: Optional[PathLike] = None) -> dict[str, Any]:
         """Gets all arguments along with reproducibility information.
 
         :param repo_path: Path to the git repo to examine for reproducibility info.
@@ -418,7 +418,10 @@ def _log_all(self, repo_path: Optional[PathLike] = None) -> Dict[str, Any]:
         return arg_log
 
     def parse_args(
-        self: TapType, args: Optional[Sequence[str]] = None, known_only: bool = False, legacy_config_parsing=False
+        self: TapType,
+        args: Optional[Sequence[str]] = None,
+        known_only: bool = False,
+        legacy_config_parsing: bool = False,
     ) -> TapType:
         """Parses arguments, sets attributes of self equal to the parsed arguments, and processes arguments.
 
@@ -483,7 +486,7 @@ def parse_args(
         return self
 
     @classmethod
-    def _get_from_self_and_super(cls, extract_func: Callable[[type], dict]) -> Union[Dict[str, Any], Dict]:
+    def _get_from_self_and_super(cls, extract_func: Callable[[type], dict]) -> Union[dict[str, Any], dict]:
         """Returns a dictionary mapping variable names to values.
 
         Variables and values are extracted from classes using key starting
@@ -518,7 +521,7 @@ def _get_from_self_and_super(cls, extract_func: Callable[[type], dict]) -> Union
 
         return dictionary
 
-    def _get_class_dict(self) -> Dict[str, Any]:
+    def _get_class_dict(self) -> dict[str, Any]:
         """Returns a dictionary mapping class variable names to values from the class dict."""
         class_dict = self._get_from_self_and_super(
             extract_func=lambda super_class: dict(getattr(super_class, "__dict__", dict()))
@@ -531,7 +534,7 @@ def _get_class_dict(self) -> Dict[str, Any]:
 
         return class_dict
 
-    def _get_annotations(self) -> Dict[str, Any]:
+    def _get_annotations(self) -> dict[str, Any]:
         """Returns a dictionary mapping variable names to their type annotations."""
         return self._get_from_self_and_super(extract_func=lambda super_class: dict(get_type_hints(super_class)))
 
@@ -559,7 +562,7 @@ def _get_class_variables(self) -> dict:
 
         return class_variables
 
-    def _get_argument_names(self) -> Set[str]:
+    def _get_argument_names(self) -> set[str]:
         """Returns a list of variable names corresponding to the arguments."""
         return (
             {get_dest(*name_or_flags, **kwargs) for name_or_flags, kwargs in self.argument_buffer.values()}
@@ -567,7 +570,7 @@ def _get_argument_names(self) -> Set[str]:
             | set(self._annotations.keys())
         ) - {"help"}
 
-    def as_dict(self) -> Dict[str, Any]:
+    def as_dict(self) -> dict[str, Any]:
         """Returns the member variables corresponding to the parsed arguments.
 
         Note: This does not include attributes set directly on an instance
@@ -596,7 +599,7 @@ def as_dict(self) -> Dict[str, Any]:
 
         return stored_dict
 
-    def from_dict(self, args_dict: Dict[str, Any], skip_unsettable: bool = False) -> TapType:
+    def from_dict(self, args_dict: dict[str, Any], skip_unsettable: bool = False) -> TapType:
         """Loads arguments from a dictionary, ensuring all required arguments are set.
 
         :param args_dict: A dictionary from argument names to the values of the arguments.
@@ -682,7 +685,7 @@ def load(
 
         return self
 
-    def _load_from_config_files(self, config_files: Optional[List[str]]) -> List[str]:
+    def _load_from_config_files(self, config_files: Optional[list[str]]) -> list[str]:
         """Loads arguments from a list of configuration files containing command line arguments.
 
         :param config_files: A list of paths to configuration files containing the command line arguments
@@ -708,7 +711,7 @@ def __str__(self) -> str:
         """
         return pformat(self.as_dict())
 
-    def __deepcopy__(self, memo: Dict[int, Any] = None) -> TapType:
+    def __deepcopy__(self, memo: dict[int, Any] = None) -> TapType:
         """Deepcopy the Tap object."""
         copied = type(self).__new__(type(self))
 
@@ -722,11 +725,11 @@ def __deepcopy__(self, memo: Dict[int, Any] = None) -> TapType:
 
         return copied
 
-    def __getstate__(self) -> Dict[str, Any]:
+    def __getstate__(self) -> dict[str, Any]:
         """Gets the state of the object for pickling."""
         return self.as_dict()
 
-    def __setstate__(self, d: Dict[str, Any]) -> None:
+    def __setstate__(self, d: dict[str, Any]) -> None:
         """
         Initializes the object with the provided dictionary of arguments for unpickling.
 
diff --git a/src/tap/tapify.py b/src/tap/tapify.py
index 51e3213..65e03e8 100644
--- a/src/tap/tapify.py
+++ b/src/tap/tapify.py
@@ -7,7 +7,7 @@
 
 import dataclasses
 import inspect
-from typing import Any, Callable, Dict, List, Optional, Sequence, Type, TypeVar, Union
+from typing import Any, Callable, Optional, Sequence, Type, TypeVar, Union
 
 from docstring_parser import Docstring, parse
 from packaging.version import Version
@@ -68,7 +68,7 @@ class _TapData:
     Data about a class' or function's arguments which are sufficient to inform a Tap class.
     """
 
-    args_data: List[_ArgData]
+    args_data: list[_ArgData]
     "List of data about each argument in the class or function"
 
     has_kwargs: bool
@@ -79,7 +79,7 @@ class _TapData:
 
 
 def _is_pydantic_base_model(obj: Union[Type[Any], Any]) -> bool:
-    if inspect.isclass(obj):  # issublcass requires that obj is a class
+    if inspect.isclass(obj):  # issubclass requires that obj is a class
         return issubclass(obj, BaseModel)
     else:
         return isinstance(obj, BaseModel)
@@ -94,7 +94,7 @@ def _is_pydantic_dataclass(obj: Union[Type[Any], Any]) -> bool:
 
 
 def _tap_data_from_data_model(
-    data_model: Any, func_kwargs: Dict[str, Any], param_to_description: Dict[str, str] = None
+    data_model: Any, func_kwargs: dict[str, Any], param_to_description: dict[str, str] = None
 ) -> _TapData:
     """
     Currently only works when `data_model` is a:
@@ -153,7 +153,7 @@ def arg_data_from_pydantic(name: str, field: _PydanticField, annotation: Optiona
     # dataclass fields in a pydantic BaseModel. It's also possible to use (builtin) dataclass fields and pydantic Fields
     # in the same data model. Therefore, the type of the data model doesn't determine the type of each field. The
     # solution is to iterate through the fields and check each type.
-    args_data: List[_ArgData] = []
+    args_data: list[_ArgData] = []
     for name, field in name_to_field.items():
         if isinstance(field, dataclasses.Field):
             # Idiosyncrasy: if a pydantic Field is used in a pydantic dataclass, then field.default is a FieldInfo
@@ -177,7 +177,7 @@ def arg_data_from_pydantic(name: str, field: _PydanticField, annotation: Optiona
 
 
 def _tap_data_from_class_or_function(
-    class_or_function: _ClassOrFunction, func_kwargs: Dict[str, Any], param_to_description: Dict[str, str]
+    class_or_function: _ClassOrFunction, func_kwargs: dict[str, Any], param_to_description: dict[str, str]
 ) -> _TapData:
     """
     Extract data by inspecting the signature of `class_or_function`.
@@ -186,7 +186,7 @@ def _tap_data_from_class_or_function(
     ----
     Deletes redundant keys from `func_kwargs`
     """
-    args_data: List[_ArgData] = []
+    args_data: list[_ArgData] = []
     has_kwargs = False
     known_only = False
 
@@ -240,7 +240,7 @@ def _docstring(class_or_function) -> Docstring:
     return parse(doc)
 
 
-def _tap_data(class_or_function: _ClassOrFunction, param_to_description: Dict[str, str], func_kwargs) -> _TapData:
+def _tap_data(class_or_function: _ClassOrFunction, param_to_description: dict[str, str], func_kwargs) -> _TapData:
     """
     Controls how :class:`_TapData` is extracted from `class_or_function`.
     """
@@ -298,7 +298,7 @@ def to_tap_class(class_or_function: _ClassOrFunction) -> Type[Tap]:
 def tapify(
     class_or_function: Union[Callable[[InputType], OutputType], Type[OutputType]],
     known_only: bool = False,
-    command_line_args: Optional[List[str]] = None,
+    command_line_args: Optional[list[str]] = None,
     explicit_bool: bool = False,
     description: Optional[str] = None,
     **func_kwargs,
@@ -339,7 +339,7 @@ def tapify(
 
     # Prepare command line arguments for class_or_function, respecting positional-only args
     class_or_function_args: list[Any] = []
-    class_or_function_kwargs: Dict[str, Any] = {}
+    class_or_function_kwargs: dict[str, Any] = {}
     command_line_args_dict = command_line_args.as_dict()
     for arg_data in tap_data.args_data:
         arg_value = command_line_args_dict[arg_data.name]
diff --git a/src/tap/utils.py b/src/tap/utils.py
index 4456d7d..cc5bb75 100644
--- a/src/tap/utils.py
+++ b/src/tap/utils.py
@@ -1,8 +1,6 @@
 from argparse import ArgumentParser, ArgumentTypeError
 import ast
 from base64 import b64encode, b64decode
-import copy
-from functools import wraps
 import inspect
 from io import StringIO
 from json import JSONEncoder
@@ -16,15 +14,11 @@
 from typing import (
     Any,
     Callable,
-    Dict,
     Generator,
     Iterable,
     Iterator,
-    List,
     Literal,
     Optional,
-    Set,
-    Tuple,
     Union,
 )
 from typing_inspect import get_args as typing_inspect_get_args, get_origin as typing_inspect_get_origin
@@ -38,7 +32,7 @@
 PathLike = Union[str, os.PathLike]
 
 
-def check_output(command: List[str], suppress_stderr: bool = True, **kwargs) -> str:
+def check_output(command: list[str], suppress_stderr: bool = True, **kwargs) -> str:
     """Runs subprocess.check_output and returns the result as a string.
 
     :param command: A list of strings representing the command to run on the command line.
@@ -225,7 +219,7 @@ def get_class_column(tokens: Iterable[tokenize.TokenInfo]) -> int:
     raise ValueError("Could not find any class variables in the class.")
 
 
-def source_line_to_tokens(tokens: Iterable[tokenize.TokenInfo]) -> Dict[int, List[Dict[str, Union[str, int]]]]:
+def source_line_to_tokens(tokens: Iterable[tokenize.TokenInfo]) -> dict[int, list[dict[str, Union[str, int]]]]:
     """Extract a map from each line number to list of mappings providing information about each token."""
     line_to_tokens = {}
     for token_type, token, (start_line, start_column), (end_line, end_column), line in tokens:
@@ -244,7 +238,7 @@ def source_line_to_tokens(tokens: Iterable[tokenize.TokenInfo]) -> Dict[int, Lis
     return line_to_tokens
 
 
-def get_subsequent_assign_lines(source_cls: str) -> Tuple[Set[int], Set[int]]:
+def get_subsequent_assign_lines(source_cls: str) -> tuple[set[int], set[int]]:
     """For all multiline assign statements, get the line numbers after the first line in the assignment.
 
     :param source_cls: The source code of the class.
@@ -301,7 +295,7 @@ def get_subsequent_assign_lines(source_cls: str) -> Tuple[Set[int], Set[int]]:
     return intermediate_assign_lines, final_assign_lines
 
 
-def get_class_variables(cls: type) -> Dict[str, Dict[str, str]]:
+def get_class_variables(cls: type) -> dict[str, dict[str, str]]:
     """Returns a dictionary mapping class variables to their additional information (currently just comments)."""
     # Get the source code and tokens of the class
     source_cls = inspect.getsource(cls)
@@ -387,7 +381,7 @@ def get_class_variables(cls: type) -> Dict[str, Dict[str, str]]:
     return variable_to_comment
 
 
-def get_literals(literal: Literal, variable: str) -> Tuple[Callable[[str], Any], List[type]]:
+def get_literals(literal: Literal, variable: str) -> tuple[Callable[[str], Any], list[type]]:
     """Extracts the values from a Literal type and ensures that the values are all primitive types."""
     literals = list(get_args(literal))
 
@@ -424,7 +418,7 @@ def boolean_type(flag_value: str) -> bool:
 class TupleTypeEnforcer:
     """The type argument to argparse for checking and applying types to Tuples."""
 
-    def __init__(self, types: List[type], loop: bool = False):
+    def __init__(self, types: list[type], loop: bool = False):
         self.types = [boolean_type if t == bool else t for t in types]
         self.loop = loop
         self.index = 0
@@ -545,7 +539,7 @@ def as_python_object(dct: Any) -> Any:
 
 
 def enforce_reproducibility(
-    saved_reproducibility_data: Optional[Dict[str, str]], current_reproducibility_data: Dict[str, str], path: PathLike
+    saved_reproducibility_data: Optional[dict[str, str]], current_reproducibility_data: dict[str, str], path: PathLike
 ) -> None:
     """Checks if reproducibility has failed and raises the appropriate error.
 
@@ -597,7 +591,7 @@ def get_origin(tp: Any) -> Any:
 
 
 # TODO: remove this once typing_inspect.get_args is fixed for Python 3.10 union types
-def get_args(tp: Any) -> Tuple[type, ...]:
+def get_args(tp: Any) -> tuple[type, ...]:
     """Same as typing_inspect.get_args but fixes Python 3.10 union types."""
     if sys.version_info >= (3, 10) and isinstance(tp, UnionType):
         return tp.__args__
diff --git a/tests/test_actions.py b/tests/test_actions.py
index cb60dd8..c5e56d1 100644
--- a/tests/test_actions.py
+++ b/tests/test_actions.py
@@ -1,4 +1,3 @@
-import sys
 from typing import List, Literal
 import unittest
 from unittest import TestCase
diff --git a/tests/test_integration.py b/tests/test_integration.py
index e97a44e..85612e1 100644
--- a/tests/test_integration.py
+++ b/tests/test_integration.py
@@ -21,7 +21,7 @@ def write(self, msg):
 sys.stderr = DevNull()
 
 
-def stringify(arg_list: Iterable[Any]) -> List[str]:
+def stringify(arg_list: Iterable[Any]) -> list[str]:
     """Converts an iterable of arguments of any type to a list of strings.
 
     :param arg_list: An iterable of arguments of any type.
diff --git a/tests/test_tapify.py b/tests/test_tapify.py
index 9a575f2..291ac9e 100644
--- a/tests/test_tapify.py
+++ b/tests/test_tapify.py
@@ -6,7 +6,7 @@
 from dataclasses import dataclass
 import io
 import sys
-from typing import Dict, List, Optional, Tuple, Any
+from typing import List, Optional, Tuple, Any
 import unittest
 from unittest import TestCase
 
@@ -237,21 +237,21 @@ def __eq__(self, other: str) -> bool:
             self.assertEqual(output, "1 simple 3.14 -0.3 True wee")
 
     def test_tapify_complex_types(self):
-        def concat(complexity: List[str], requires: Tuple[int, int], intelligence: Person) -> str:
+        def concat(complexity: list[str], requires: tuple[int, int], intelligence: Person) -> str:
             return f'{" ".join(complexity)} {requires[0]} {requires[1]} {intelligence}'
 
-        def concat_with_positionals(complexity: List[str], /, requires: Tuple[int, int], intelligence: Person) -> str:
+        def concat_with_positionals(complexity: list[str], /, requires: tuple[int, int], intelligence: Person) -> str:
             return f'{" ".join(complexity)} {requires[0]} {requires[1]} {intelligence}'
 
         class Concat:
-            def __init__(self, complexity: List[str], requires: Tuple[int, int], intelligence: Person):
+            def __init__(self, complexity: list[str], requires: tuple[int, int], intelligence: Person):
                 self.kwargs = {"complexity": complexity, "requires": requires, "intelligence": intelligence}
 
             def __eq__(self, other: str) -> bool:
                 return other == concat(**self.kwargs)
 
         class ConcatWithPositionals:
-            def __init__(self, complexity: List[str], /, requires: Tuple[int, int], intelligence: Person):
+            def __init__(self, complexity: list[str], /, requires: tuple[int, int], intelligence: Person):
                 self.kwargs = {"complexity": complexity, "requires": requires, "intelligence": intelligence}
 
             def __eq__(self, other: str) -> bool:
@@ -1468,7 +1468,7 @@ def __eq__(self, other: str) -> bool:
             pydantic_data_models = []
 
         class Concat:
-            def __init__(self, a: int, b: int = 2, **kwargs: Dict[str, str]):
+            def __init__(self, a: int, b: int = 2, **kwargs: dict[str, str]):
                 """Concatenate three numbers.
 
                 :param a: The first number.
@@ -1482,7 +1482,7 @@ def __eq__(self, other: str) -> bool:
                 return other == concat(self.a, self.b, **self.kwargs)
 
         class ConcatWithPositionals:
-            def __init__(self, a: int, /, b: int = 2, **kwargs: Dict[str, str]):
+            def __init__(self, a: int, /, b: int = 2, **kwargs: dict[str, str]):
                 """Concatenate three numbers.
 
                 :param a: The first number.
diff --git a/tests/test_to_tap_class.py b/tests/test_to_tap_class.py
index c26ba1a..c439741 100644
--- a/tests/test_to_tap_class.py
+++ b/tests/test_to_tap_class.py
@@ -7,7 +7,7 @@
 import io
 import re
 import sys
-from typing import Any, Callable, Dict, List, Literal, Optional, Tuple, Type, Union
+from typing import Any, Callable, List, Literal, Optional, Type, Union
 
 from packaging.version import Version
 import pytest
@@ -250,7 +250,7 @@ def _test_raises_system_exit(tap: Tap, args_string: str) -> str:
 def _test_subclasser(
     subclasser: Callable[[Any], Type[Tap]],
     class_or_function: Any,
-    args_string_and_arg_to_expected_value: Tuple[str, Union[Dict[str, Any], BaseException]],
+    args_string_and_arg_to_expected_value: tuple[str, Union[dict[str, Any], BaseException]],
     test_call: bool = True,
 ):
     """
@@ -333,7 +333,7 @@ def replace_whitespace(string: str) -> str:
     ],
 )
 def test_subclasser_simple(
-    class_or_function_: Any, args_string_and_arg_to_expected_value: Tuple[str, Union[Dict[str, Any], BaseException]]
+    class_or_function_: Any, args_string_and_arg_to_expected_value: tuple[str, Union[dict[str, Any], BaseException]]
 ):
     _test_subclasser(subclasser_simple, class_or_function_, args_string_and_arg_to_expected_value)
 
@@ -406,7 +406,7 @@ def test_subclasser_simple_help_message(class_or_function_: Any):
     ],
 )
 def test_subclasser_complex(
-    class_or_function_: Any, args_string_and_arg_to_expected_value: Tuple[str, Union[Dict[str, Any], BaseException]]
+    class_or_function_: Any, args_string_and_arg_to_expected_value: tuple[str, Union[dict[str, Any], BaseException]]
 ):
     # Currently setting test_call=False b/c all data models except the pydantic Model don't accept extra args
     _test_subclasser(subclasser_complex, class_or_function_, args_string_and_arg_to_expected_value, test_call=False)
@@ -485,7 +485,7 @@ def test_subclasser_complex_help_message(class_or_function_: Any):
     ],
 )
 def test_subclasser_subparser(
-    class_or_function_: Any, args_string_and_arg_to_expected_value: Tuple[str, Union[Dict[str, Any], BaseException]]
+    class_or_function_: Any, args_string_and_arg_to_expected_value: tuple[str, Union[dict[str, Any], BaseException]]
 ):
     # Currently setting test_call=False b/c all data models except the pydantic Model don't accept extra args
     _test_subclasser(subclasser_subparser, class_or_function_, args_string_and_arg_to_expected_value, test_call=False)
@@ -544,7 +544,7 @@ def test_subclasser_subparser(
     ],
 )
 def test_subclasser_subparser_help_message(
-    class_or_function_: Any, args_string_and_description_and_expected_message: Tuple[str, str]
+    class_or_function_: Any, args_string_and_description_and_expected_message: tuple[str, str]
 ):
     args_string, description, expected_message = args_string_and_description_and_expected_message
     _test_subclasser_message(