diff --git a/glass/ext/__init__.py b/glass/ext/__init__.py
index bb7a8501..dd44fdb9 100644
--- a/glass/ext/__init__.py
+++ b/glass/ext/__init__.py
@@ -6,6 +6,9 @@
 
 """
 
+import os.path
+from pkgutil import extend_path
+
 
 def _extend_path(path: list[str], name: str) -> list[str]:
     """
@@ -23,9 +26,6 @@ def _extend_path(path: list[str], name: str) -> list[str]:
         The extended path.
 
     """
-    import os.path
-    from pkgutil import extend_path
-
     _pkg, _, _mod = name.partition(".")
 
     return list(
diff --git a/glass/fields.py b/glass/fields.py
index 0d02f4de..e433dc51 100644
--- a/glass/fields.py
+++ b/glass/fields.py
@@ -29,6 +29,7 @@
 import collections.abc
 import typing
 import warnings
+from itertools import combinations_with_replacement, product
 
 import healpy as hp
 import numpy as np
@@ -553,8 +554,6 @@ def effective_cls(
         If the shapes of *weights1* and *weights2* are incompatible.
 
     """
-    from itertools import combinations_with_replacement, product
-
     # this is the number of fields
     n = int((2 * len(cls)) ** 0.5)
     if n * (n + 1) // 2 != len(cls):
diff --git a/glass/shells.py b/glass/shells.py
index 34f5a2ca..8fcde046 100644
--- a/glass/shells.py
+++ b/glass/shells.py
@@ -52,6 +52,7 @@
 import numpy as np
 import numpy.typing as npt
 
+from glass.core.algorithm import nnls
 from glass.core.array import ndinterp
 
 if typing.TYPE_CHECKING:
@@ -644,8 +645,6 @@ def partition_nnls(
         The partition.
 
     """
-    from glass.core.algorithm import nnls
-
     # make sure nothing breaks
     sumtol = max(sumtol, 1e-4)
 
diff --git a/tests/test_points.py b/tests/test_points.py
index 0aede8a8..a4e545ab 100644
--- a/tests/test_points.py
+++ b/tests/test_points.py
@@ -20,9 +20,6 @@
 
     import pytest_mock
 
-if typing.TYPE_CHECKING:
-    import collections.abc
-
 
 def catpos(
     pos: collections.abc.Generator[