diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 44d35dc..00f31b9 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -4,6 +4,7 @@ build:
   os: ubuntu-24.04
   tools:
     python: "3.13"
+    rust: "1.86"
   jobs:
     pre_install:
     - cargo install sphinx-rustdocgen