diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index a7a72874..726a09f7 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -17,7 +17,7 @@ python:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.10"
+    python: "3.9"
 
 sphinx:
    configuration: docs/source/conf.py