diff --git a/dev.yml b/dev.yml
index 7f45ce8..11f73c3 100644
--- a/dev.yml
+++ b/dev.yml
@@ -6,7 +6,7 @@ markdown_extensions:
     - toc:
         separator: "_"
         permalink: "#"
-        slugify: !!python/name:pymdownx.slugs.uslugify
+        slugify: !!python/object/apply:pymdownx.slugs.slugify {kwds: {case: "lower", percent_encode: true}}
     - attr_list
     - admonition
     - sane_lists