Fail on warning for read the doc
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index f3e25df..c0fb278 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,9 +3,10 @@
 version: 2
 
 sphinx:
+  fail_on_warning: true
   configuration: doc/conf.py
 
 python:
-  version: 3.7
+  version: 3.8
   install:
     - requirements: doc/requirements.txt