diff --git a/.readthedocs.yml b/.readthedocs.yml
index 5d6d86d..e97f635 100755
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -3,7 +3,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.12"
+    python: "3.9"
 python:
   install:
     - requirements: docs/source/requirements.txt