diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 593793c2..e55e07e4 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -15,3 +15,6 @@ python:
       path: .
       extra_requirements:
         - docs
+
+# Build all formats for RTD Downloads - htmlzip, pdf, epub
+formats: all