diff --git a/.readthedocs.yml b/.readthedocs.yml
index 17eba34f3..e4d3f02cc 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,4 +1,5 @@
 version: 2
+formats: all
 sphinx:
   configuration: docs/conf.py
   fail_on_warning: true