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..bcf91586 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,6 +3,6 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "3.12"
 sphinx:
   configuration: docs/conf.py
diff --git a/docs/conf.py b/docs/conf.py
index 9181df25..eef8154a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -13,6 +13,7 @@
 
 extensions = [
     'sphinx.ext.autodoc',
+    'sphinx_rtd_theme',
 ]
 
 source_suffix = '.rst'
@@ -29,7 +30,7 @@
 
 # -- Options for HTML output ----------------------------------------------
 
-html_theme = 'default'
+html_theme = 'sphinx_rtd_theme'
 
 htmlhelp_basename = 'yamllintdoc'