diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 0f029d2f..363472a3 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -9,7 +9,12 @@ version: 2
 sphinx:
   configuration: docs/conf.py
 
+# Set the version of python needed to build these docs.
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.8"
+
 python:
-  version: 3.8
   install:
     - requirements: requirements/doc.txt