diff --git a/.readthedocs.yml b/.readthedocs.yml
index 73ea4cb7e..6cfbf5d31 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,7 +1,9 @@
 version: 2
 
+formats: all
+
 python:
-    version: 3.7
-    install:
-      - requirements: requirements/docs.txt
-      - requirements: requirements/readthedocs.txt
+  version: 3.7
+  install:
+    - requirements: requirements/docs.txt
+    - requirements: requirements/readthedocs.txt