diff --git a/docs/sphinx/source/changelog/pending.rst b/docs/sphinx/source/changelog/pending.rst
index 95e46e5c..12e3d23a 100644
--- a/docs/sphinx/source/changelog/pending.rst
+++ b/docs/sphinx/source/changelog/pending.rst
@@ -11,5 +11,5 @@ Requirements
 * Bump ``ipython==7.16.3``, ``jupyter-console==6.4.0``,
   and ``prompt-toolkit==3.0.27`` in ``docs/notebook_requirements.txt``
   and bump ``Pillow==9.0.0`` in ``requirements.txt`` (:pull:`314`)
-* Bump ``nbsphinx`` version from 0.8.5 to 0.8.8 in the optional
-  ``[doc]`` requirements (:pull:`317`)
+* Bump ``sphinx`` version from 3.2 to 4.5 and ``nbsphinx`` version
+  from 0.8.5 to 0.8.8 in the optional ``[doc]`` requirements (:pull:`317`, :pull:`325`)
diff --git a/setup.py b/setup.py
index add256aa..12951aa0 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@
 
 EXTRAS_REQUIRE = {
     'doc': [
-        'sphinx==3.2',
+        'sphinx==4.5.0',
         'nbsphinx==0.8.8',
         'nbsphinx-link==1.3.0',
         'sphinx_rtd_theme==0.5.2',