diff --git a/docs/_source/conf.py b/docs/_source/conf.py
index e89a178..3cb20f5 100644
--- a/docs/_source/conf.py
+++ b/docs/_source/conf.py
@@ -35,7 +35,7 @@ napoleon_numpy_docstring = True
 napoleon_attr_annotations = True
 
 # HTML output
-html_theme = "furo"
+html_theme = "sphinx_rtd_theme"
 html_static_path = ["_static"]
 html_title = "Aborist API Reference"
 
diff --git a/docs/_source/requirements.txt b/docs/_source/requirements.txt
index 4edd720..1cd72b0 100644
--- a/docs/_source/requirements.txt
+++ b/docs/_source/requirements.txt
@@ -1,3 +1,3 @@
 # Sphinx documentation build dependencies for Read the Docs
 sphinx>=8.0
-furo>=2024.0
+sphinx-rtd-theme>=3.0