diff --git a/doc/conf.py b/doc/conf.py
index ab6806a3d..db5e5678d 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -68,7 +68,7 @@ exclude_patterns = [
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'default'
+html_theme = 'sphinx_book_theme'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 011822d54..cdaa42658 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,6 +1,7 @@
 wheel
 
 sphinx > 3.0
+sphinx-book-theme
 
 # convert markdown to rest
 # m2r2 fork is active in development and works with