diff --git a/_config.yml b/_config.yml
index cf58f39..6c38fdc 100644
--- a/_config.yml
+++ b/_config.yml
@@ -260,7 +260,6 @@ keep_files:
 # Plug-ins
 plugins:
   - jekyll-archives
-  - jekyll-diagrams
   - jekyll-email-protect
   - jekyll-feed
   - jekyll-get-json