diff --git a/.readthedocs.yml b/.readthedocs.yml
index 404510d..9779d7d 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,5 +1,10 @@
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+
 # Build from the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py