diff --git a/.readthedocs.yml b/.readthedocs.yml
index 1649ccb..330e974 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -2,8 +2,11 @@
 version: 2
 sphinx:
   configuration: docs/conf.py
+build:
+  os: ubuntu-22.04
+  tools:
+    # Keep in sync with docs build CI job.
+    python: "3.11"
 python:
-  # Keep in sync with docs build CI job.
-  version: "3.11"
   install:
     - requirements: docs/requirements.txt