diff --git a/readthedocs.yml b/readthedocs.yml
index ed623e2..03102e2 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -3,7 +3,7 @@ version: 2
 build:
   os: "ubuntu-22.04"
   tools:
-    python: "3.11"
+    python: "3.9"
 
 python:
   install: