diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3e4c966740..208e5c37e2 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,8 +1,11 @@
 version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
 sphinx:
   configuration: docs/source/conf.py
 python:
-  version: 3.8
   install:
     # install itself with pip install .
     - method: pip