diff --git a/README.md b/README.md
index b9c430f..91c3b34 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,7 @@ In the case that the tool can not migrate content or functionality it will creat
 
 ## Creating a build
 1. Clone this repo
-2. Run `composer update`
+2. Run `composer update --no-dev`
 3. Run `box build` to actually create the PHAR file  in `dist/`. See also https://github.com/humbug/box
 
 # TODO