diff --git a/README.md b/README.md
index 863275c..d687ac6 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,7 @@ With this in mind, let's use Joe's shiny app inside our code block. So, we'll en
 #| standalone: true
 #| viewerHeight: 600
 library(shiny)
+library(bslib)
 
 # Define UI for app that draws a histogram ----
 ui <- page_sidebar(
diff --git a/index.qmd b/index.qmd
index 3e24212..b9ee6fb 100644
--- a/index.qmd
+++ b/index.qmd
@@ -187,6 +187,7 @@ With this in mind, let's use Joe's shiny app inside our code block. So, we'll en
 #| standalone: true
 #| viewerHeight: 600
 library(shiny)
+library(bslib)
 
 # Define UI for app that draws a histogram ----
 ui <- page_sidebar(