diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c358c76..ee23bbc 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -22,6 +22,7 @@ repos:
       - id: debug-statements
       - id: end-of-file-fixer
       - id: forbid-submodules
+      - id: requirements-txt-fixer
       - id: trailing-whitespace
         exclude: \.github/ISSUE_TEMPLATE\.md|\.github/PULL_REQUEST_TEMPLATE\.md
 
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 2373928..235b349 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,6 @@
 mkdocs==1.6.1
+mkdocs-include-markdown-plugin
 mkdocs-material
 mkdocstrings[python]==0.27.0
-mkdocs-include-markdown-plugin
 pygments
 pymdown-extensions==10.14.3
diff --git a/requirements-mypy.txt b/requirements-mypy.txt
new file mode 100644
index 0000000..a9d99a5
--- /dev/null
+++ b/requirements-mypy.txt
@@ -0,0 +1,4 @@
+mypy==1.15.0
+pytest
+types-freezegun
+types-setuptools
diff --git a/src/humanize/i18n.py b/src/humanize/i18n.py
index dd94c7a..a6a5cb1 100644
--- a/src/humanize/i18n.py
+++ b/src/humanize/i18n.py
@@ -4,8 +4,8 @@
 
 import gettext as gettext_module
 from threading import local
-from typing import TYPE_CHECKING
 
+TYPE_CHECKING = False
 if TYPE_CHECKING:
     import os
     import pathlib
diff --git a/src/humanize/lists.py b/src/humanize/lists.py
index 1573be8..3a52f1e 100644
--- a/src/humanize/lists.py
+++ b/src/humanize/lists.py
@@ -2,7 +2,9 @@
 
 from __future__ import annotations
 
-from typing import Any
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Any
 
 __all__ = ["natural_list"]
 
diff --git a/src/humanize/number.py b/src/humanize/number.py
index 084d6a6..ac12dc8 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -3,24 +3,24 @@
 from __future__ import annotations
 
 import math
-import re
-import sys
-from typing import TYPE_CHECKING
 
 from .i18n import _gettext as _
 from .i18n import _ngettext, decimal_separator, thousands_separator
 from .i18n import _ngettext_noop as NS_
 from .i18n import _pgettext as P_
 
+TYPE_CHECKING = False
 if TYPE_CHECKING:
+    import sys
+
     if sys.version_info >= (3, 10):
         from typing import TypeAlias
     else:
         from typing_extensions import TypeAlias
 
-# This type can be better defined by typing.SupportsInt, typing.SupportsFloat
-# but that's a Python 3.8 only typing option.
-NumberOrString: TypeAlias = "float | str"
+    # This type can be better defined by typing.SupportsFloat
+    # but that's a Python 3.8 only typing option.
+    NumberOrString: TypeAlias = float | str
 
 
 def _format_not_finite(value: float) -> str:
@@ -165,6 +165,8 @@ def intcomma(value: NumberOrString, ndigits: int | None = None) -> str:
     else:
         orig = str(value)
     orig = orig.replace(".", decimal_sep)
+    import re
+
     while True:
         new = re.sub(r"^(-?\d+)(\d{3})", rf"\g<1>{thousands_sep}\g<2>", orig)
         if orig == new:
@@ -429,6 +431,8 @@ def scientific(value: NumberOrString, precision: int = 2) -> str:
     n = fmt.format(value)
     part1, part2 = n.split("e")
     # Remove redundant leading '+' or '0's (preserving the last '0' for 10⁰).
+    import re
+
     part2 = re.sub(r"^\+?(\-?)0*(.+)$", r"\1\2", part2)
 
     new_part2 = []
diff --git a/src/humanize/time.py b/src/humanize/time.py
index b40d76e..b058d05 100644
--- a/src/humanize/time.py
+++ b/src/humanize/time.py
@@ -5,18 +5,20 @@
 
 from __future__ import annotations
 
-import collections.abc
 import datetime as dt
 import math
-import typing
 from enum import Enum
 from functools import total_ordering
-from typing import Any
 
 from .i18n import _gettext as _
 from .i18n import _ngettext
 from .number import intcomma
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterable
+    from typing import Any
+
 __all__ = [
     "naturaldate",
     "naturalday",
@@ -37,7 +39,7 @@ class Unit(Enum):
     MONTHS = 6
     YEARS = 7
 
-    def __lt__(self, other: typing.Any) -> typing.Any:
+    def __lt__(self, other: Any) -> Any:
         if self.__class__ is other.__class__:
             return self.value < other.value
         return NotImplemented
@@ -62,9 +64,7 @@ def _abs_timedelta(delta: dt.timedelta) -> dt.timedelta:
     return delta
 
 
-def _date_and_delta(
-    value: typing.Any, *, now: dt.datetime | None = None
-) -> tuple[typing.Any, typing.Any]:
+def _date_and_delta(value: Any, *, now: dt.datetime | None = None) -> tuple[Any, Any]:
     """Turn a value into a date and a timedelta which represents how long ago it was.
 
     If that's not possible, return `(None, value)`.
@@ -327,7 +327,7 @@ def _quotient_and_remainder(
     divisor: float,
     unit: Unit,
     minimum_unit: Unit,
-    suppress: collections.abc.Iterable[Unit],
+    suppress: Iterable[Unit],
 ) -> tuple[float, float]:
     """Divide `value` by `divisor` returning the quotient and remainder.
 
@@ -368,7 +368,7 @@ def _carry(
     ratio: float,
     unit: Unit,
     min_unit: Unit,
-    suppress: typing.Iterable[Unit],
+    suppress: Iterable[Unit],
 ) -> tuple[float, float]:
     """Return a tuple with two values.
 
@@ -401,7 +401,7 @@ def _carry(
     return value1, value2
 
 
-def _suitable_minimum_unit(min_unit: Unit, suppress: typing.Iterable[Unit]) -> Unit:
+def _suitable_minimum_unit(min_unit: Unit, suppress: Iterable[Unit]) -> Unit:
     """Return a minimum unit suitable that is not suppressed.
 
     If not suppressed, return the same unit:
@@ -430,7 +430,7 @@ def _suitable_minimum_unit(min_unit: Unit, suppress: typing.Iterable[Unit]) -> U
     return min_unit
 
 
-def _suppress_lower_units(min_unit: Unit, suppress: typing.Iterable[Unit]) -> set[Unit]:
+def _suppress_lower_units(min_unit: Unit, suppress: Iterable[Unit]) -> set[Unit]:
     """Extend suppressed units (if any) with all units lower than the minimum unit.
 
     >>> from humanize.time import _suppress_lower_units, Unit
@@ -449,7 +449,7 @@ def _suppress_lower_units(min_unit: Unit, suppress: typing.Iterable[Unit]) -> se
 def precisedelta(
     value: dt.timedelta | int | None,
     minimum_unit: str = "seconds",
-    suppress: typing.Iterable[str] = (),
+    suppress: Iterable[str] = (),
     format: str = "%0.2f",
 ) -> str:
     """Return a precise representation of a timedelta.
diff --git a/tox.ini b/tox.ini
index 508f747..9c75151 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,10 +40,7 @@ commands =
 
 [testenv:mypy]
 deps =
-    mypy==1.12
-    pytest
-    types-freezegun
-    types-setuptools
+    -r requirements-mypy.txt
 commands =
     mypy . {posargs}