diff --git a/.readthedocs.yml b/.readthedocs.yml
index 31086da..1f6fd19 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -2,7 +2,7 @@ build:
     image: latest
 
 python:
-    version: 3
+    version: 4.0rc1
     pip_install: true
 
 requirements_file: requires/docs.txt