diff --git a/docs/conf.py b/docs/conf.py
index 872ec09..5c14a0e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,6 +1,5 @@
 import datetime
 import subprocess
-from urllib.parse import urlsplit, urlunsplit
 
 # -- Project information -----------------------------------------------------
 
@@ -32,61 +31,8 @@
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
-# General substitutions.
-try:
-    SHA = subprocess.check_output(
-        ['git', 'rev-parse', 'HEAD']).decode('utf-8').strip()
-# Catch the case where git is not installed locally, and use the setuptools_scm
-# version number instead.
-except (subprocess.CalledProcessError, FileNotFoundError):
-    import hashlib
-    import matplotlib
-    import mpl_sphinx_theme
-    import pydata_sphinx_theme
-    SHA = hashlib.sha256(
-        (f'{matplotlib.__version__} '
-         f'{mpl_sphinx_theme.__version__} '
-         f'{pydata_sphinx_theme.__version__}').encode('utf-8')).hexdigest()
-SHA = SHA[:20]
-
-
 # -- Options for HTML output -------------------------------------------------
 
-def add_html_cache_busting(app, pagename, templatename, context, doctree):
-    """
-    Add cache busting query on CSS and JavaScript assets.
-
-    This adds the Matplotlib version as a query to the link reference in the
-    HTML, if the path is not absolute (i.e., it comes from the `_static`
-    directory) and doesn't already have a query.
-    """
-    from sphinx.builders.html import Stylesheet, JavaScript
-
-    css_tag = context['css_tag']
-    js_tag = context['js_tag']
-
-    def css_tag_with_cache_busting(css):
-        if isinstance(css, Stylesheet) and css.filename is not None:
-            url = urlsplit(css.filename)
-            if not url.netloc and not url.query:
-                url = url._replace(query=SHA)
-                css = Stylesheet(urlunsplit(url), priority=css.priority,
-                                 **css.attributes)
-        return css_tag(css)
-
-    def js_tag_with_cache_busting(js):
-        if isinstance(js, JavaScript) and js.filename is not None:
-            url = urlsplit(js.filename)
-            if not url.netloc and not url.query:
-                url = url._replace(query=SHA)
-                js = JavaScript(urlunsplit(url), priority=js.priority,
-                                **js.attributes)
-        return js_tag(js)
-
-    context['css_tag'] = css_tag_with_cache_busting
-    context['js_tag'] = js_tag_with_cache_busting
-
-
 html_css_files = ['css/normalize.css', 'css/landing.css']
 html_theme = "mpl_sphinx_theme"
 html_favicon = "_static/favicon.ico"
@@ -103,10 +49,3 @@ def js_tag_with_cache_busting(js):
 
 # Prefix added to all the URLs generated in the 404 page.
 notfound_urls_prefix = '/'
-
-
-# -----------------------------------------------------------------------------
-# Sphinx setup
-# -----------------------------------------------------------------------------
-def setup(app):
-    app.connect('html-page-context', add_html_cache_busting, priority=1000)
diff --git a/requirements.txt b/requirements.txt
index 696746d..0d73aed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@ jinja2>3
 mpl-sphinx-theme~=3.7.1
 pydata-sphinx-theme~=0.13.0
 pygments>=2.7
-sphinx
+sphinx>=7.1
 sphinx-notfound-page