diff --git a/_pages/sinatra-app-tutorial.md b/_pages/sinatra-app-tutorial.md
index 1f1ed99f..b425ccaf 100644
--- a/_pages/sinatra-app-tutorial.md
+++ b/_pages/sinatra-app-tutorial.md
@@ -22,7 +22,7 @@ Explain shortly what [Sinatra](https://sinatrarb.com) is.
 
 Remember how we needed to install Ruby on Rails? Similarly we need to install Sinatra:
 
-`gem install sinatra`
+`gem install sinatra webrick`
 
 ### Create your first Sinatra app