diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a599b6..e3b2b14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,7 +50,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         #pip install -U -e .[docs]
-        pip install sphinx
+        pip install sphinx sphinx_rtd_theme
     - name: Build docs
       run: |
         cd docs
diff --git a/docs/conf.py b/docs/conf.py
index 06558d5..f94602b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -39,7 +39,8 @@
 sphinxver = sphinx.version_info
 extensions = [
     "sphinx.ext.autodoc",
-    "sphinx.ext.napoleon" if sphinxver >= (1, 3) else "sphinxcontrib.napoleon",
+    "sphinx.ext.napoleon",
+    "sphinx_rtd_theme",
     "pscriptexample",
 ]
 
@@ -65,3 +66,7 @@
 
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = "sphinx"
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = "sphinx_rtd_theme"
diff --git a/pyproject.toml b/pyproject.toml
index d9369bf..47cd909 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = []
 [project.optional-dependencies]
 lint = ["ruff"]
 tests = ["pytest"]
-docs = ["sphinx"]
+docs = ["sphinx", "sphinx_rtd_theme"]
 dev = ["pscript[lint,tests, docs]"]
 
 [project.urls]