diff --git a/scripts/upgrade b/scripts/upgrade
index 7076ecf..26052c5 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -53,6 +53,16 @@ ynh_add_systemd_config
 
 yunohost service add $app --description="Local file sharing in your browser" --log="/var/log/$app/$app.log"
 
+#=================================================
+# BUILD YARN DEPENDENCIES
+#=================================================
+ynh_script_progression --message="Building Yarn dependencies..."
+
+pushd "$install_dir"
+	ynh_use_nodejs
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm install
+popd
+
 #=================================================
 # RECONFIGURE THE APP (UPDATE CONF, APPLY MIGRATIONS...)
 #=================================================