diff --git a/intro.Rmd b/intro.Rmd
index 444608d..a0af36d 100644
--- a/intro.Rmd
+++ b/intro.Rmd
@@ -133,9 +133,9 @@ You'll also need to install some R packages. An R _package_ is a collection of f
 
 ```{r}
 pkgs <- c(
-  "DBI", "devtools", "dplyr", "ggplot2", "haven", "knitr", "lubridate", 
-  "packrat", "readr", "rmarkdown", "RSQLite", "rvest", "scales", "shiny", 
-  "stringr", "tidyr"
+  "bookdown", "broom", "dplyr", "ggplot2", "jpeg", "jsonlite", 
+  "knitr", "microbenchmark", "png", "pryr", "purrr", "readr", "stringr", 
+  "tidyr"
 )
 install.packages(pkgs)
 ```