diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 071ad406..f9643647 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,17 +1,17 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.6.8
+    rev: v0.9.3
     hooks:
       - id: ruff
         args: [--exit-non-zero-on-fix]
 
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 24.8.0
+    rev: 24.10.0
     hooks:
       - id: black
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.6.0
+    rev: v5.0.0
     hooks:
       - id: check-case-conflict
       - id: check-merge-conflict
@@ -22,24 +22,24 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.29.2
+    rev: 0.31.0
     hooks:
       - id: check-dependabot
       - id: check-github-workflows
 
   - repo: https://github.com/rhysd/actionlint
-    rev: v1.7.2
+    rev: v1.7.7
     hooks:
       - id: actionlint
 
   - repo: https://github.com/tox-dev/pyproject-fmt
-    rev: 2.2.4
+    rev: v2.5.0
     hooks:
       - id: pyproject-fmt
         args: [--max-supported-python=3.13]
 
   - repo: https://github.com/abravalheri/validate-pyproject
-    rev: v0.20.2
+    rev: v0.23
     hooks:
       - id: validate-pyproject
 
diff --git a/README.md b/README.md
index f77b4910..24308f77 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +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.
 
 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 9b7c60ff..1b34d905 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,10 @@ classifiers = [
   "Topic :: Documentation",
   "Topic :: Software Development :: Documentation",
 ]
+dependencies = [
+  "sphinx>=3.4",
+]
+
 urls.Code = "https://github.com/python/python-docs-theme"
 urls.Download = "https://pypi.org/project/python-docs-theme/"
 urls.Homepage = "https://github.com/python/python-docs-theme/"
diff --git a/python_docs_theme/__init__.py b/python_docs_theme/__init__.py
index 0ee7d25d..295c1c53 100644
--- a/python_docs_theme/__init__.py
+++ b/python_docs_theme/__init__.py
@@ -53,6 +53,8 @@ def _html_page_context(
 
 
 def setup(app):
+    app.require_sphinx("3.4")
+
     current_dir = os.path.abspath(os.path.dirname(__file__))
     app.add_html_theme("python_docs_theme", current_dir)