diff --git a/scripts/_common.sh b/scripts/_common.sh
index 6b4020a..406bdfb 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -6,7 +6,7 @@
 
 # dependencies used by the app
 YNH_PHP_VERSION="7.3"
-
+YNH_COMPOSER_VERSION=2.1.1
 extra_php_dependencies="php${YNH_PHP_VERSION}-mbstring php${YNH_PHP_VERSION}-intl php${YNH_PHP_VERSION}-xml php${YNH_PHP_VERSION}-cli"
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index 2771085..a52cab7 100644
--- a/scripts/install
+++ b/scripts/install
@@ -123,7 +123,7 @@ ynh_script_progression --message="Initializing database..." --weight=2
 # Install composer
 ynh_install_composer
 
-ynh_exec_warn_less php$YNH_PHP_VERSION "$final_path/admin/migration.php"
+ynh_exec_warn_less php$phpversion "$final_path/admin/migration.php"
 
 #=================================================
 # GENERIC FINALIZATION
@@ -131,7 +131,6 @@ ynh_exec_warn_less php$YNH_PHP_VERSION "$final_path/admin/migration.php"
 # SECURE FILES AND DIRECTORIES
 #=================================================
 
-chown -R root: "$final_path"
 chown -R $app: "$final_path/"{tpl_c,admin/stdout.log}
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 41f8b55..28f3128 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -23,6 +23,7 @@ is_public=$(ynh_app_setting_get --app=$app --key=is_public)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 language=$(ynh_app_setting_get --app=$app --key=language)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+db_user=$db_name
 phpversion=$(ynh_app_setting_get --app="$app" --key=phpversion)
 db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
 email=$(ynh_app_setting_get --app=$app --key=email)