diff --git a/.readthedocs.yml b/.readthedocs.yml
index e4b27415e..a736c080f 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -13,7 +13,7 @@ build:
   jobs:
     post_install:
       # install metatensor-models
-      - python -m pip install .
+      - python -m pip install . --extra-index-url https://download.pytorch.org/whl/cpu -v
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: