diff --git a/slides/_metadata.yml b/slides/_metadata.yml
index 10603ac3..9e801442 100644
--- a/slides/_metadata.yml
+++ b/slides/_metadata.yml
@@ -7,6 +7,14 @@ format:
     incremental: true
     theme: slides.scss
     footer: "Course website: <https://rnabioco.github.io/molb-7950>"
+    drop:
+      engine: webr
+      webr:
+        packages:
+          - ggplot2
+          - dplyr
+          
 revealjs-plugins:
   - drop
+  
 search: false
\ No newline at end of file