diff --git a/readthedocs.yml b/readthedocs.yml
index dfb341fd..ea48ada9 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -14,7 +14,8 @@ sphinx:
 #  configuration: mkdocs.yml
 
 # Optionally build your docs in additional formats such as PDF and ePub
-formats: all
+formats:
+  - epub
 
 build:
   os: ubuntu-22.04