diff --git a/nibabel/_compression.py b/nibabel/_compression.py
index f697fa54c..871be2629 100644
--- a/nibabel/_compression.py
+++ b/nibabel/_compression.py
@@ -12,12 +12,13 @@
 
 import bz2
 import gzip
-import io
 import typing as ty
 
 from .optpkg import optional_package
 
 if ty.TYPE_CHECKING:
+    import io
+
     import indexed_gzip  # type: ignore[import]
     import pyzstd
 
diff --git a/nibabel/fileholders.py b/nibabel/fileholders.py
index 3db4c62a9..df7c34af6 100644
--- a/nibabel/fileholders.py
+++ b/nibabel/fileholders.py
@@ -10,12 +10,14 @@
 
 from __future__ import annotations
 
-import io
 import typing as ty
 from copy import copy
 
 from .openers import ImageOpener
 
+if ty.TYPE_CHECKING:
+    import io
+
 
 class FileHolderError(Exception):
     pass
diff --git a/nibabel/optpkg.py b/nibabel/optpkg.py
index bfe6a629c..90b8ded51 100644
--- a/nibabel/optpkg.py
+++ b/nibabel/optpkg.py
@@ -3,12 +3,14 @@
 from __future__ import annotations
 
 import typing as ty
-from types import ModuleType
 
 from packaging.version import Version
 
 from .tripwire import TripWire
 
+if ty.TYPE_CHECKING:
+    from types import ModuleType
+
 
 def _check_pkg_version(min_version: str | Version) -> ty.Callable[[ModuleType], bool]:
     min_ver = Version(min_version) if isinstance(min_version, str) else min_version
diff --git a/nibabel/spatialimages.py b/nibabel/spatialimages.py
index bd5ff8c11..ce8ee3c6e 100644
--- a/nibabel/spatialimages.py
+++ b/nibabel/spatialimages.py
@@ -132,9 +132,7 @@
 
 from __future__ import annotations
 
-import io
 import typing as ty
-from collections.abc import Sequence
 from typing import Literal
 
 import numpy as np
@@ -153,6 +151,9 @@
     from functools import lru_cache as cache
 
 if ty.TYPE_CHECKING:
+    import io
+    from collections.abc import Sequence
+
     import numpy.typing as npt
 
     from .arrayproxy import ArrayLike
diff --git a/nibabel/testing/__init__.py b/nibabel/testing/__init__.py
index f41c657f5..be111747b 100644
--- a/nibabel/testing/__init__.py
+++ b/nibabel/testing/__init__.py
@@ -27,11 +27,10 @@
 from .np_features import memmap_after_ufunc
 
 if ty.TYPE_CHECKING:
-    from importlib_resources.abc import Traversable
+    from importlib.resources.abc import Traversable
 
 try:
     from importlib.resources import as_file, files
-    from importlib.resources.abc import Traversable
 except ImportError:  # PY38
     from importlib_resources import as_file, files
 
diff --git a/nibabel/volumeutils.py b/nibabel/volumeutils.py
index c2387f094..6e43f7918 100644
--- a/nibabel/volumeutils.py
+++ b/nibabel/volumeutils.py
@@ -10,7 +10,6 @@
 
 from __future__ import annotations
 
-import io
 import sys
 import typing as ty
 import warnings
@@ -25,6 +24,8 @@
 from .externals.oset import OrderedSet
 
 if ty.TYPE_CHECKING:
+    import io
+
     import numpy.typing as npt
 
     Scalar = np.number | float