diff --git a/docs/conf.py b/docs/conf.py
index 132cf3c8..ec68fbeb 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,7 +53,6 @@
     "polartoolkit": ("https://polartoolkit.readthedocs.io/en/latest/", None),
     "numba": ("https://numba.pydata.org/numba-doc/latest/", None),
     "scipy": ("https://docs.scipy.org/doc/scipy/", None),
-    # nptyping
     # numba_progress
     "sklearn": ("https://scikit-learn.org/stable/", None),
     "dask": ("https://docs.dask.org/en/stable/", None),
diff --git a/pyproject.toml b/pyproject.toml
index 0fdea9f5..f9e23375 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,6 @@ dependencies = [
   "pygmt",
   "dask",
   "deprecation",
-  "nptyping",
 ###
 # optimization
 ###
diff --git a/src/invert4geom/cross_validation.py b/src/invert4geom/cross_validation.py
index 44188384..09e5920c 100644
--- a/src/invert4geom/cross_validation.py
+++ b/src/invert4geom/cross_validation.py
@@ -15,7 +15,7 @@
 import sklearn
 import verde as vd
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 from polartoolkit import maps
 from polartoolkit import utils as polar_utils
 from tqdm.autonotebook import tqdm
diff --git a/src/invert4geom/inversion.py b/src/invert4geom/inversion.py
index df4f116e..6c6181ea 100644
--- a/src/invert4geom/inversion.py
+++ b/src/invert4geom/inversion.py
@@ -16,7 +16,7 @@
 import pandas as pd
 import scipy as sp
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 from tqdm.autonotebook import tqdm
 
 from invert4geom import cross_validation, log, optimization, plotting, regional, utils
diff --git a/src/invert4geom/optimization.py b/src/invert4geom/optimization.py
index e95f01ff..64d2000a 100644
--- a/src/invert4geom/optimization.py
+++ b/src/invert4geom/optimization.py
@@ -20,7 +20,7 @@
 import pandas as pd
 import psutil
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 from optuna.storages import JournalFileStorage, JournalStorage
 from tqdm.autonotebook import tqdm
 
diff --git a/src/invert4geom/regional.py b/src/invert4geom/regional.py
index 1c1b1b13..cc109bd2 100644
--- a/src/invert4geom/regional.py
+++ b/src/invert4geom/regional.py
@@ -7,7 +7,7 @@
 import pandas as pd
 import pygmt
 import verde as vd
-from nptyping import NDArray
+from numpy.typing import NDArray
 
 from invert4geom import cross_validation, log, optimization, utils
 
diff --git a/src/invert4geom/synthetic.py b/src/invert4geom/synthetic.py
index d08cfb8f..3209005f 100644
--- a/src/invert4geom/synthetic.py
+++ b/src/invert4geom/synthetic.py
@@ -8,7 +8,7 @@
 import pooch
 import verde as vd
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 from polartoolkit import fetch, maps
 from polartoolkit import utils as polar_utils
 
diff --git a/src/invert4geom/uncertainty.py b/src/invert4geom/uncertainty.py
index c8522c3a..a75374cc 100644
--- a/src/invert4geom/uncertainty.py
+++ b/src/invert4geom/uncertainty.py
@@ -10,7 +10,7 @@
 import pandas as pd
 import UQpy
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 from polartoolkit import utils as polar_utils
 from tqdm.autonotebook import tqdm
 from UQpy.sampling import LatinHypercubeSampling as LHS
diff --git a/src/invert4geom/utils.py b/src/invert4geom/utils.py
index a5f00823..cf9d6820 100644
--- a/src/invert4geom/utils.py
+++ b/src/invert4geom/utils.py
@@ -15,7 +15,7 @@
 import verde as vd
 import xarray as xr
 import xrft
-from nptyping import NDArray
+from numpy.typing import NDArray
 from pykdtree.kdtree import KDTree  # pylint: disable=no-name-in-module
 
 import invert4geom
diff --git a/tests/test_inversion.py b/tests/test_inversion.py
index 53691da4..e1c307e4 100644
--- a/tests/test_inversion.py
+++ b/tests/test_inversion.py
@@ -7,7 +7,7 @@
 import pytest
 import verde as vd
 import xarray as xr
-from nptyping import NDArray
+from numpy.typing import NDArray
 
 from invert4geom import inversion