diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 0c73f33..a91de81 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -9,7 +9,7 @@ build:
   tools:
     nodejs: "24"
     python: "miniconda-latest"
-    ruby: "3.3"
+    ruby: "4.0.7"
     rust: "1.91"
   jobs:
     build: