diff --git a/.readthedocs.yml b/.readthedocs.yml
index 47d12ba3..18572bb6 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -3,7 +3,7 @@ version: 2
 build:
   os: ubuntu-20.04
   tools:
-    python: '3.9'
+    python: '3.13'
   apt_packages:
     - graphviz