diff --git a/scripts/upgrade b/scripts/upgrade
index c9be392..70d6dd7 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -15,6 +15,12 @@ source /usr/share/yunohost/helpers
 
 upgrade_type=$(ynh_check_app_version_changed)
 
+#=================================================
+# MOVE COMPOSER LOCK TO BACK IT UP
+#=================================================
+
+mv /var/www/roundcube/composer.lock /var/www/roundcube/composer.lock.bak
+
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
 #=================================================