diff --git a/book/_config.yml b/book/_config.yml
index b959ce9..9447089 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -29,6 +29,7 @@ sphinx:
   extra_extensions:
     - sphinx.ext.imgconverter
     - jupyterbook_patches
+    - download_link_replacer
     - sphinx.ext.extlinks
 
 bibtex_bibfiles: