diff --git a/.readthedocs.yml b/.readthedocs.yml
index 93c2aa5a..6fa2ea01 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -9,5 +9,5 @@ formats:
   - pdf
 
 submodules:
-  - include: all
-  - recursive: true
+  include: all
+  recursive: true