diff --git a/episodes/06-extra-design.Rmd b/episodes/06-extra-design.Rmd
index 529c7af1..2f8d6ba9 100644
--- a/episodes/06-extra-design.Rmd
+++ b/episodes/06-extra-design.Rmd
@@ -45,6 +45,7 @@ suppressPackageStartupMessages({
     library(SummarizedExperiment)
     library(ExploreModelMatrix)
     library(dplyr)
+    library(DESeq2)
 })
 ```