diff --git a/doc/conf.py b/doc/conf.py
index 5125e31..5be307d 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -18,7 +18,7 @@
 intersphinx_mapping = {
     'IPython': ('https://ipython.readthedocs.io/en/stable/', None),
     'matplotlib': ('https://matplotlib.org/', None),
-    'numpy': ('https://docs.scipy.org/doc/numpy/', None),
+    'numpy': ('https://numpy.org/doc/stable/', None),
     'python': ('https://docs.python.org/3/', None),
     'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
     'sympy': ('https://docs.sympy.org/latest/', None),
diff --git a/doc/rotation/quaternions.ipynb b/doc/rotation/quaternions.ipynb
index 50d2a8c..3eeb511 100644
--- a/doc/rotation/quaternions.ipynb
+++ b/doc/rotation/quaternions.ipynb
@@ -120,7 +120,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "There are even more ways to represent quaterions,\n",
+    "There are even more ways to represent quaternions,\n",
     "for example\n",
     "as 2x2 complex matrices\n",
     "or\n",