diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index f91c7c9..2173a3e 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -26,3 +26,4 @@ formats:
 python:
    install:
      - requirements: docs/requirements.txt
+     - sphinx-rtd-theme