diff --git a/_config.yml b/_config.yml
index f19c784..86f7eb4 100644
--- a/_config.yml
+++ b/_config.yml
@@ -24,6 +24,7 @@ update:
     diagram: common-flow.svg
 
 gems:
+  - jekyll-pants
   - jekyll-sitemap
   - jekyll-seo-tag