diff --git a/manifest.toml b/manifest.toml
index 52b7a55..6043e37 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -5,7 +5,7 @@ id = "globinours"
 name = "Globinours"
 description.en = "Lightweight animal shelter management"
 description.fr = "Gestion légère et complète pour refuges animaliers"
-version = "1.0.0-rc.3~ynh3"
+version = "1.0.0-rc.3~ynh4"
 maintainers = ["OverSu"]
 
 [upstream]
diff --git a/scripts/upgrade b/scripts/upgrade
index 340c476..3e669d1 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,7 +1,10 @@
 #!/bin/bash
 source _common.sh
-if [[ -f "$install_dir/scripts/backup.php" && -f "$data_dir/refuge.sqlite" ]]; then
+if [[ -f "$install_dir/scripts/backup.php" && -f "$data_dir/refuge.sqlite" ]] && \
+    php -l "$install_dir/app/Services/BackupService.php" >/dev/null 2>&1; then
     ynh_exec_as_app php "$install_dir/scripts/backup.php" pre-upgrade-yunohost
+elif [[ -f "$data_dir/refuge.sqlite" ]]; then
+    ynh_print_warn --message="La sauvegarde applicative préalable est ignorée car l'ancienne version n'est pas compatible avec PHP $php_version. La sauvegarde de sécurité YunoHost reste active."
 fi
 touch "$data_dir/storage/maintenance.flag"
 trap 'rm -f "$data_dir/storage/maintenance.flag"' EXIT