diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 587e03ee992..dd4249e4133 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,7 +7,7 @@ version: 2
 build:
   os: ubuntu-26.04
   tools:
-    ruby: "3.3"
+    ruby: "4.0"
   apt_packages:
     - 7zip
     - jq