diff --git a/docs/conf.py b/docs/conf.py
index 7450e70..272a059 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -115,7 +115,7 @@
 
 
 def setup(app):
-    app.add_stylesheet("css/theme_override.css")
+    app.add_css_file("css/theme_override.css")
 
 
 html_theme = "sphinx_rtd_theme"