diff --git a/.readthedocs.yml b/.readthedocs.yml
index b5029e8..81128eb 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,9 +1,9 @@
-formats: []
+version: 2
 
 build:
-  image: latest
-  tools:
-    python: "3.9"
+  os: ubuntu-20.04
+    tools:
+      python: "3.9"
 
 python:
   install:
@@ -13,3 +13,7 @@ python:
       extra_requirements:
         - docs
   system_packages: true
+
+sphinx:
+  builder: dirhtml
+  fail_on_warning: true