diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 780831e9..7e55e6ad 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -21,7 +21,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
       - run:
-          pip install flake8 flake8-import-order sphinx rstcheck[sphinx] doc8
+          pip install flake8 flake8-import-order sphinx sphinx_rtd_theme
+          rstcheck[sphinx] doc8
       - run: pip install .
       - run: flake8 .
       - run: doc8 $(git ls-files '*.rst')
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index fe9f594b..4d6a2546 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,6 +3,9 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "3.12"
 sphinx:
   configuration: docs/conf.py
+python:
+  install:
+    - requirements: docs/requirements.txt
diff --git a/docs/conf.py b/docs/conf.py
index 9181df25..8a03b2fb 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -6,12 +6,12 @@
 from unittest.mock import MagicMock
 
 sys.path.insert(0, os.path.abspath('..'))
-
 from yamllint import __copyright__, APP_NAME, APP_VERSION  # noqa: I001, E402
 
 # -- General configuration ------------------------------------------------
 
 extensions = [
+    'sphinx_rtd_theme',
     'sphinx.ext.autodoc',
 ]
 
@@ -29,7 +29,7 @@
 
 # -- Options for HTML output ----------------------------------------------
 
-html_theme = 'default'
+html_theme = 'sphinx_rtd_theme'
 
 htmlhelp_basename = 'yamllintdoc'
 
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 00000000..f5a35649
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1 @@
+sphinx-rtd-theme >=2.0.0