diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3c33f707d..44f05d541 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -2,7 +2,7 @@ version: 2
 sphinx:
    configuration: docs/conf.py
 python:
-  version: "3.10"
+  version: "3.9"
   install:
     - method: pip
       path: ./src/