diff --git a/serenity.md b/serenity.md
index 35568df..a72fce8 100644
--- a/serenity.md
+++ b/serenity.md
@@ -15,7 +15,7 @@ https://github.com/SerenityOS/serenity/blob/master/Documentation/BuildInstructio
 ```
 Toolchain/BuildRuby.sh
 
-sudo apt -y install python3-docutils meson ninja-build
+sudo apt -y install python3-docutils meson ninja-build rake
 ```
 
 ## Ruby