diff --git a/Modules.md b/Modules.md
index 7d51b8e..b0d83e6 100644
--- a/Modules.md
+++ b/Modules.md
@@ -78,7 +78,7 @@ rm Omeka-S-module-ImageServer-master.tar.gz
 mv Omeka-S-module-ImageServer-masteer ./ImageServer
 chown -R www-data.www-data ImageServer
 cd ImageServer
-composer install
+composer install --no-dev
 ```
 
 # Universal Viewer