diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ad9ec7..cb3076c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@
 
 - Apply the Ruff `B` rules [#100](https://github.com/python-backoff/backoff/pull/100) (from [@edgarrmondragon](https://github.com/edgarrmondragon))
 
+- Apply the Ruff `FA` rules [#104](https://github.com/python-backoff/backoff/pull/104) (from [@edgarrmondragon](https://github.com/edgarrmondragon))
+
 ## [v2.3.1] - 2025-12-18
 
 ### Fixed
diff --git a/backoff/_decorator.py b/backoff/_decorator.py
index 708152e..3be55f6 100644
--- a/backoff/_decorator.py
+++ b/backoff/_decorator.py
@@ -1,7 +1,9 @@
+from __future__ import annotations
+
 import inspect
 import logging
 import operator
-from typing import Any, Callable, Iterable, Optional, Type, Union
+from typing import TYPE_CHECKING, Any, Callable, Iterable
 
 from backoff import _async, _sync
 from backoff._common import (
@@ -11,28 +13,30 @@
     _prepare_logger,
 )
 from backoff._jitter import full_jitter
-from backoff._typing import (
-    _CallableT,
-    _Handler,
-    _Jitterer,
-    _MaybeCallable,
-    _MaybeLogger,
-    _MaybeSequence,
-    _Predicate,
-    _WaitGenerator,
-)
+
+if TYPE_CHECKING:
+    from backoff._typing import (
+        _CallableT,
+        _Handler,
+        _Jitterer,
+        _MaybeCallable,
+        _MaybeLogger,
+        _MaybeSequence,
+        _Predicate,
+        _WaitGenerator,
+    )
 
 
 def on_predicate(
     wait_gen: _WaitGenerator,
     predicate: _Predicate[Any] = operator.not_,
     *,
-    max_tries: Optional[_MaybeCallable[int]] = None,
-    max_time: Optional[_MaybeCallable[float]] = None,
-    jitter: Union[_Jitterer, None] = full_jitter,
-    on_success: Union[_Handler, Iterable[_Handler], None] = None,
-    on_backoff: Union[_Handler, Iterable[_Handler], None] = None,
-    on_giveup: Union[_Handler, Iterable[_Handler], None] = None,
+    max_tries: _MaybeCallable[int] | None = None,
+    max_time: _MaybeCallable[float] | None = None,
+    jitter: _Jitterer | None = full_jitter,
+    on_success: _Handler | Iterable[_Handler] | None = None,
+    on_backoff: _Handler | Iterable[_Handler] | None = None,
+    on_giveup: _Handler | Iterable[_Handler] | None = None,
     logger: _MaybeLogger = "backoff",
     backoff_log_level: int = logging.INFO,
     giveup_log_level: int = logging.ERROR,
@@ -124,15 +128,15 @@ def decorate(target):
 
 def on_exception(
     wait_gen: _WaitGenerator,
-    exception: _MaybeSequence[Type[Exception]],
+    exception: _MaybeSequence[type[Exception]],
     *,
-    max_tries: Optional[_MaybeCallable[int]] = None,
-    max_time: Optional[_MaybeCallable[float]] = None,
-    jitter: Union[_Jitterer, None] = full_jitter,
+    max_tries: _MaybeCallable[int] | None = None,
+    max_time: _MaybeCallable[float] | None = None,
+    jitter: _Jitterer | None = full_jitter,
     giveup: _Predicate[Exception] = lambda e: False,
-    on_success: Union[_Handler, Iterable[_Handler], None] = None,
-    on_backoff: Union[_Handler, Iterable[_Handler], None] = None,
-    on_giveup: Union[_Handler, Iterable[_Handler], None] = None,
+    on_success: _Handler | Iterable[_Handler] | None = None,
+    on_backoff: _Handler | Iterable[_Handler] | None = None,
+    on_giveup: _Handler | Iterable[_Handler] | None = None,
     raise_on_giveup: bool = True,
     logger: _MaybeLogger = "backoff",
     backoff_log_level: int = logging.INFO,
diff --git a/backoff/_typing.py b/backoff/_typing.py
index c2c553b..44df623 100644
--- a/backoff/_typing.py
+++ b/backoff/_typing.py
@@ -1,23 +1,26 @@
+from __future__ import annotations
+
 import logging
-from types import FunctionType
 from typing import (
+    TYPE_CHECKING,
     Any,
     Callable,
     Coroutine,
-    Dict,
     Generator,
     Sequence,
-    Tuple,
     TypedDict,
     TypeVar,
     Union,
 )
 
+if TYPE_CHECKING:
+    from types import FunctionType
+
 
 class _Details(TypedDict):
     target: FunctionType
-    args: Tuple[Any, ...]
-    kwargs: Dict[str, Any]
+    args: tuple[Any, ...]
+    kwargs: dict[str, Any]
     tries: int
     elapsed: float
 
diff --git a/backoff/_wait_gen.py b/backoff/_wait_gen.py
index 3d028c1..f015989 100644
--- a/backoff/_wait_gen.py
+++ b/backoff/_wait_gen.py
@@ -1,12 +1,14 @@
+from __future__ import annotations
+
 import itertools
 import math
-from typing import Any, Callable, Generator, Iterable, Optional, Union
+from typing import Any, Callable, Generator, Iterable
 
 
 def expo(
     base: float = 2,
     factor: float = 1,
-    max_value: Optional[float] = None,
+    max_value: float | None = None,
 ) -> Generator[float, Any, None]:
     """Generator for exponential decay.
 
@@ -32,7 +34,7 @@ def expo(
 def decay(
     initial_value: float = 1,
     decay_factor: float = 1,
-    min_value: Optional[float] = None,
+    min_value: float | None = None,
 ) -> Generator[float, Any, None]:
     """Generator for exponential decay[1]:
 
@@ -57,7 +59,7 @@ def decay(
             yield min_value
 
 
-def fibo(max_value: Optional[int] = None) -> Generator[int, None, None]:
+def fibo(max_value: int | None = None) -> Generator[int, None, None]:
     """Generator for fibonaccial decay.
 
     Args:
@@ -79,7 +81,7 @@ def fibo(max_value: Optional[int] = None) -> Generator[int, None, None]:
 
 
 def constant(
-    interval: Union[int, Iterable[float]] = 1,
+    interval: int | Iterable[float] = 1,
 ) -> Generator[float, None, None]:
     """Generator for constant intervals.
 
diff --git a/pyproject.toml b/pyproject.toml
index 424c9dc..f776562 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -194,6 +194,7 @@ extend-select = [
   "B",     # flake8-bugbear
   "C4",    # flake8-comprehensions
   "DTZ",   # flake8-datetimez
+  "FA",    # flake8-future-annotations
   "ISC",   # flake8-implicit-str-concat
   "ICN",   # flake8-import-conventions
   "LOG",   # flake8-logging