diff --git a/manifest.json b/manifest.json
index fc84d62..4d44854 100644
--- a/manifest.json
+++ b/manifest.json
@@ -17,7 +17,7 @@
         "email": ""
     },
     "requirements": {
-        "yunohost": ">= 4.1.7"
+        "yunohost": ">= 4.2.4"
     },
     "multi_instance": false,
     "services": [
diff --git a/scripts/install b/scripts/install
index 628a39d..cd008f7 100644
--- a/scripts/install
+++ b/scripts/install
@@ -87,16 +87,20 @@ ynh_add_fpm_config --usage=low --footprint=low
 # SECURE FILES AND DIRECTORIES
 #=================================================
 
-# Set right permissions for curl install
-chown -R $app: $final_path
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # SETUP SSOWAT
 #=================================================
 ynh_script_progression --message="Configuring permissions..." --weight=1
 
-# Make app public if necessary or protect it
-[ $is_public -eq 0 ] || ynh_permission_update --permission="main" --add="visitors"
+# Make app public if necessary
+if [ $is_public -eq 1 ]
+then
+	ynh_permission_update --permission="main" --add="visitors"
+fi
 
 #=================================================
 # RELOAD NGINX
diff --git a/scripts/restore b/scripts/restore
index 080f407..e511c60 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -65,7 +65,9 @@ ynh_system_user_create --username=$app
 #=================================================
 
 # Restore permissions on app files
-chown -R $app: $final_path
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # RESTORE THE PHP-FPM CONFIGURATION
diff --git a/scripts/upgrade b/scripts/upgrade
index e4e0fcf..9d067c9 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -79,7 +79,10 @@ ynh_add_fpm_config --usage=low --footprint=low
 #=================================================
 
 cp -a ../sources/* $final_path
-chown -R $app: $final_path
+
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # NGINX CONFIGURATION