diff --git a/README.md b/README.md
index 69f1f3ec..6cb69901 100644
--- a/README.md
+++ b/README.md
@@ -345,7 +345,7 @@ in memory for immediate 3D plotting in Python.
 
 ## Requirements:
 
-- [NumPy >= 1.14.5](https://www.numpy.org)
+- [NumPy >= 1.20.0](https://www.numpy.org)
 - [SciPy >= 1.1.0](https://www.scipy.org/scipylib)
 - [hankel >= 1.0.0](https://github.com/steven-murray/hankel)
 - [emcee >= 3.0.0](https://github.com/dfm/emcee)
@@ -366,7 +366,7 @@ You can contact us via <info@geostat-framework.org>.
 
 ## License
 
-[LGPLv3][license_link] © 2018-2021
+[LGPLv3][license_link] © 2018-2024
 
 [pip_link]: https://pypi.org/project/gstools
 [conda_link]: https://docs.conda.io/en/latest/miniconda.html
diff --git a/docs/source/conf.py b/docs/source/conf.py
index eb5e5fae..e89928fc 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -259,10 +259,9 @@ def setup(app):
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
     "Python": ("https://docs.python.org/", None),
-    "NumPy": ("http://docs.scipy.org/doc/numpy/", None),
-    "SciPy": ("http://docs.scipy.org/doc/scipy/reference", None),
-    "matplotlib": ("http://matplotlib.org", None),
-    "Sphinx": ("http://www.sphinx-doc.org/en/stable/", None),
+    "NumPy": ("https://numpy.org/doc/stable/", None),
+    "SciPy": ("https://docs.scipy.org/doc/scipy/", None),
+    "matplotlib": ("https://matplotlib.org/stable/", None),
     "hankel": ("https://hankel.readthedocs.io/en/latest/", None),
     "emcee": ("https://emcee.readthedocs.io/en/latest/", None),
 }
diff --git a/docs/source/index.rst b/docs/source/index.rst
index d71494ac..ecad0583 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -414,7 +414,7 @@ in memory for immediate 3D plotting in Python.
 Requirements
 ============
 
-- `Numpy >= 1.14.5 <http://www.numpy.org>`_
+- `NumPy >= 1.20.0 <http://www.numpy.org>`_
 - `SciPy >= 1.1.0 <http://www.scipy.org>`_
 - `hankel >= 1.0.0 <https://github.com/steven-murray/hankel>`_
 - `emcee >= 3.0.0 <https://github.com/dfm/emcee>`_