diff --git a/.readthedocs.yml b/.readthedocs.yml
index 2b28d0df4..28647ec7e 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -17,7 +17,9 @@ sphinx:
   configuration: docs/source/conf.py
 
 # Optionally build your docs in additional formats such as PDF and ePub
-formats: all
+formats:
+  - pdf
+  - epub
 
 # Optionally set the version of Python and requirements required to build your docs
 python: