diff --git a/scripts/upgrade b/scripts/upgrade
index 99f4fc2..0499cac 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -118,6 +118,7 @@ ynh_script_progression --message="Building EtherCalc... (this will take some tim
 pushd "$final_path"
 	ynh_use_nodejs
 	ynh_exec_warn_less npm install -g ethercalc
+	ynh_exec_warn_less npm i zappajs
 popd
 
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