diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ace177ed..90e4b632 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -56,7 +56,7 @@ jobs:
       matrix:
         os: ["ubuntu-latest", "windows-latest"]
         # Test minimum supported and latest stable from 3.x series
-        python-version: ["3.9", "3"]
+        python-version: ["3.10", "3"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
diff --git a/README.md b/README.md
index 24308f77..133daa0f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Python Docs Sphinx Theme
 
 This is the theme for the Python documentation.
-It requires Python 3.9 or newer and Sphinx 3.4 or newer.
+It requires Python 3.10 or newer and Sphinx 7.3 or newer.
 
 Note that when adopting this theme, you're also borrowing an element of the
 trust and credibility established by the CPython core developers over the
diff --git a/pyproject.toml b/pyproject.toml
index 7eb1cc2b..e03e2be2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ description = "The Sphinx theme for the CPython docs and related projects"
 readme = "README.md"
 license.file = "LICENSE"
 authors = [ { name = "PyPA", email = "distutils-sig@python.org" } ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
   "Development Status :: 5 - Production/Stable",
   "Framework :: Sphinx :: Theme",
@@ -19,7 +19,6 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -30,7 +29,7 @@ classifiers = [
 dynamic = [ "version" ]
 
 dependencies = [
-  "sphinx>=3.4",
+  "sphinx>=7.3",
 ]
 
 urls.Code = "https://github.com/python/python-docs-theme"
diff --git a/python_docs_theme/__init__.py b/python_docs_theme/__init__.py
index 5a84c840..c5b5fe79 100644
--- a/python_docs_theme/__init__.py
+++ b/python_docs_theme/__init__.py
@@ -1,16 +1,9 @@
 from __future__ import annotations
 
-import hashlib
-from functools import cache
 from pathlib import Path
 
-import sphinx.application
-from sphinx.builders.html import StandaloneHTMLBuilder
-
 TYPE_CHECKING = False
 if TYPE_CHECKING:
-    from typing import Any
-
     from sphinx.application import Sphinx
     from sphinx.util.typing import ExtensionMetadata
 
@@ -19,53 +12,11 @@
 THEME_PATH = Path(__file__).resolve().parent
 
 
-@cache
-def _asset_hash(path: str) -> str:
-    """Append a `?digest=` to an url based on the file content."""
-    full_path = THEME_PATH / path.replace("_static/", "static/")
-    digest = hashlib.sha1(full_path.read_bytes()).hexdigest()
-
-    return f"{path}?digest={digest}"
-
-
-def _add_asset_hashes(static: list[str], add_digest_to: list[str]) -> None:
-    for asset in add_digest_to:
-        index = static.index(asset)
-        static[index].filename = _asset_hash(asset)  # type: ignore[attr-defined]
-
-
-def _html_page_context(
-    app: sphinx.application.Sphinx,
-    pagename: str,
-    templatename: str,
-    context: dict[str, Any],
-    doctree: Any,
-) -> None:
-    if app.config.html_theme != "python_docs_theme":
-        return
-
-    assert isinstance(app.builder, StandaloneHTMLBuilder)
-
-    if (4,) <= sphinx.version_info < (7, 1) and "css_files" in context:
-        if "_static/pydoctheme.css" not in context["css_files"]:
-            raise ValueError(
-                "This documentation is not using `pydoctheme.css` as the stylesheet. "
-                "If you have set `html_style` in your conf.py file, remove it."
-            )
-
-        _add_asset_hashes(
-            context["css_files"],
-            ["_static/pydoctheme.css"],
-        )
-
-
 def setup(app: Sphinx) -> ExtensionMetadata:
-    app.require_sphinx("3.4")
+    app.require_sphinx("7.3")
 
     app.add_html_theme("python_docs_theme", str(THEME_PATH))
 
-    app.connect("html-page-context", _html_page_context)
-
     return {
         "version": __version__,
         "parallel_read_safe": True,
diff --git a/python_docs_theme/static/pydoctheme.css b/python_docs_theme/static/pydoctheme.css
index 8b7b2cf8..da47d3e7 100644
--- a/python_docs_theme/static/pydoctheme.css
+++ b/python_docs_theme/static/pydoctheme.css
@@ -1,5 +1,3 @@
-@import url('classic.css');
-
 /* Common colours */
 :root {
     --good-color: rgb(41 100 51);
@@ -200,16 +198,6 @@ div.sphinxsidebar input[type='text'] {
     display: flex;
     justify-content: center;
     align-items: center;
-    /* Sphinx 4.x and earlier compat */
-    height: 100%;
-    background-color: #CCCCCC;
-    margin-left: 0;
-    color: #444444;
-    font-size: 1.2em;
-    cursor: pointer;
-    padding-top: 1px;
-    float: none;
-    /* after Sphinx 4.x and earlier is dropped, only the below is needed */
     width: 12px;
     min-width: 12px;
     border-radius: 0 5px 5px 0;
diff --git a/python_docs_theme/static/sidebar.js_t b/python_docs_theme/static/sidebar.js_t
deleted file mode 100644
index a08aa0fd..00000000
--- a/python_docs_theme/static/sidebar.js_t
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * sidebar.js
- * ~~~~~~~~~~
- *
- * This file is functionally identical to "sidebar.js" in Sphinx 5.0.
- * When support for Sphinx 4 and earlier is dropped from the theme,
- * this file can be removed.
- *
- * This script makes the Sphinx sidebar collapsible.
- *
- * .sphinxsidebar contains .sphinxsidebarwrapper.  This script adds
- * in .sphinxsidebar, after .sphinxsidebarwrapper, the #sidebarbutton
- * used to collapse and expand the sidebar.
- *
- * When the sidebar is collapsed the .sphinxsidebarwrapper is hidden
- * and the width of the sidebar and the margin-left of the document
- * are decreased. When the sidebar is expanded the opposite happens.
- * This script saves a per-browser/per-session cookie used to
- * remember the position of the sidebar among the pages.
- * Once the browser is closed the cookie is deleted and the position
- * reset to the default (expanded).
- *
- * :copyright: Copyright 2007-2022 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
- */
-
-const initialiseSidebar = () => {
-  // global elements used by the functions.
-  const bodyWrapper = document.getElementsByClassName("bodywrapper")[0]
-  const sidebar = document.getElementsByClassName("sphinxsidebar")[0]
-  const sidebarWrapper = document.getElementsByClassName("sphinxsidebarwrapper")[0]
-
-  // exit early if the document has no sidebar for some reason
-  if (typeof sidebar === "undefined") {
-    return
-  }
-
-{# Check if we need to dynamically insert the sidebar button.
- # We prefer the ``sphinx_version_tuple`` variable, and if it is undefined we
- # know we are running a Sphinx version older than 4.2.
- #
- # See: https://www.sphinx-doc.org/en/master/development/templating.html#sphinx_version_tuple
- #}
-{% if sphinx_version_tuple is defined and sphinx_version_tuple[0] >= 5 %}
-  const sidebarButton = document.getElementById("sidebarbutton")
-  const sidebarArrow = sidebarButton.querySelector('span')
-{% else %}
-  // create the sidebar button element
-  const sidebarButton = document.createElement("div")
-  sidebarButton.id = "sidebarbutton"
-  // create the sidebar button arrow element
-  const sidebarArrow = document.createElement("span")
-  sidebarArrow.innerText =  "«"
-  sidebarButton.appendChild(sidebarArrow)
-  sidebar.appendChild(sidebarButton)
-{% endif %}
-
-  const collapse_sidebar = () => {
-    bodyWrapper.style.marginLeft = ".8em"
-    sidebar.style.width = ".8em"
-    sidebarWrapper.style.display = "none"
-    sidebarArrow.innerText = "»"
-    sidebarButton.title = _("Expand sidebar")
-    window.localStorage.setItem("sidebar", "collapsed")
-  }
-
-  const expand_sidebar = () => {
-    bodyWrapper.style.marginLeft = ""
-    sidebar.style.removeProperty("width")
-    sidebarWrapper.style.display = ""
-    sidebarArrow.innerText = "«"
-    sidebarButton.title = _("Collapse sidebar")
-    window.localStorage.setItem("sidebar", "expanded")
-  }
-
-  sidebarButton.addEventListener("click", () => {
-    (sidebarWrapper.style.display === "none") ? expand_sidebar() : collapse_sidebar()
-  })
-
-  const sidebar_state = window.localStorage.getItem("sidebar")
-  if (sidebar_state === "collapsed") {
-    collapse_sidebar()
-  }
-  else if (sidebar_state === "expanded") {
-    expand_sidebar()
-  }
-}
-
-if (document.readyState !== "loading") {
-  initialiseSidebar()
-}
-else {
-  document.addEventListener("DOMContentLoaded", initialiseSidebar)
-}
diff --git a/python_docs_theme/theme.conf b/python_docs_theme/theme.conf
deleted file mode 100644
index 5edf397a..00000000
--- a/python_docs_theme/theme.conf
+++ /dev/null
@@ -1,37 +0,0 @@
-[theme]
-inherit = default
-stylesheet = pydoctheme.css
-pygments_style = default
-pygments_dark_style = monokai
-
-[options]
-bodyfont = -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif
-headfont = -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif
-footerbgcolor = white
-footertextcolor = #555555
-relbarbgcolor = white
-relbartextcolor = #666666
-relbarlinkcolor = #444444
-sidebarbgcolor = white
-sidebartextcolor = #444444
-sidebarlinkcolor = #444444
-sidebarbtncolor = #cccccc
-bgcolor = white
-textcolor = #222222
-linkcolor = #0090c0
-visitedlinkcolor = #00608f
-headtextcolor = #1a1a1a
-headbgcolor = white
-headlinkcolor = #aaaaaa
-codebgcolor = #eeffcc
-codetextcolor = #333333
-
-hosted_on =
-issues_url =
-license_url =
-root_name = Python
-root_url = https://www.python.org/
-root_icon = py.svg
-root_icon_alt_text = Python logo
-root_include_title = True
-copyright_url =
diff --git a/python_docs_theme/theme.toml b/python_docs_theme/theme.toml
new file mode 100644
index 00000000..1d3cdbda
--- /dev/null
+++ b/python_docs_theme/theme.toml
@@ -0,0 +1,39 @@
+[theme]
+inherit = "default"
+stylesheets = [
+    "classic.css",
+    "pydoctheme.css",
+]
+pygments_style = { default = "default", dark = "monokai" }
+
+[options]
+bodyfont = "-apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif"
+headfont = "-apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif"
+footerbgcolor = "white"
+footertextcolor = "#555555"
+relbarbgcolor = "white"
+relbartextcolor = "#666666"
+relbarlinkcolor = "#444444"
+sidebarbgcolor = "white"
+sidebartextcolor = "#444444"
+sidebarlinkcolor = "#444444"
+sidebarbtncolor = "#cccccc"
+bgcolor = "white"
+textcolor = "#222222"
+linkcolor = "#0090c0"
+visitedlinkcolor = "#00608f"
+headtextcolor = "#1a1a1a"
+headbgcolor = "white"
+headlinkcolor = "#aaaaaa"
+codebgcolor = "#eeffcc"
+codetextcolor = "#333333"
+
+hosted_on = ""
+issues_url = ""
+license_url = ""
+root_name = "Python"
+root_url = "https://www.python.org/"
+root_icon = "py.svg"
+root_icon_alt_text = "Python logo"
+root_include_title = "True"
+copyright_url = ""