diff --git a/.readthedocs.yml b/.readthedocs.yml
index 4f35059c5d..e1aee404d5 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,5 +1,6 @@
 version: 2
-formats: htmlzip
+formats:
+  - htmlzip
 
 build:
   os: ubuntu-22.04