diff --git a/scripts/upgrade b/scripts/upgrade
index 280eb7d..582158c 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -56,6 +56,10 @@ exec_occ() {
     if [[ "$NEXTCLOUD_PHP_VERSION" != "$phpversion" ]]; then
         local pkg_dependencies="$(dpkg-query --show --showformat='${Depends}' ${app}-ynh-deps)"
         pkg_dependencies="${pkg_dependencies//$phpversion/$NEXTCLOUD_PHP_VERSION}"
+        # Packaging v1 ~legacy : ynh_install_app_dependencies is designed to be called several times
+        # but the second time it will *append* the list of dependencies rather than replace the existing dependencies
+        # resulting in a crash when parsing what's the php version the app uses, hence we need to force the full-replacement
+        YNH_INSTALL_APP_DEPENDENCIES_REPLACE=true
         ynh_install_app_dependencies "$pkg_dependencies"
     fi 
 (cd "$install_dir" && ynh_exec_as "$app" \