diff --git a/docs/conf.py b/docs/conf.py
index 29f87f01..75c603a9 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -58,11 +58,4 @@
 # overwrite the builtin "default.css".
 # html_static_path = ["_static"]
 
-
-if is_on_readthedocs:
-    html_theme = "default"
-else:
-    import sphinx_rtd_theme
-
-    html_theme = "sphinx_rtd_theme"
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme = "sphinx_rtd_theme"
diff --git a/docs/requirements.txt b/docs/requirements.txt
index a839f13c..ef81d70d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,3 @@
 .
 sphinx-autodoc-typehints
+sphinx-rtd-theme