diff --git a/docs/source/conf.py b/docs/source/conf.py
index 684577736..8b440e06e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -65,6 +65,7 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
+    'pydata_sphinx_theme',
     'sphinx.ext.autodoc',
     'sphinx.ext.doctest',
     'sphinx.ext.intersphinx',