diff --git a/.travis.yml b/.travis.yml
index e84c576..6133a24 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-language: node_js
+language: python
 
 before_install:
   - git clone https://github.com/YunoHost/package_linter /tmp/package_linter
diff --git a/scripts/upgrade b/scripts/upgrade
index 148e0fa..cd3c8ab 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -113,6 +113,8 @@ ynh_system_user_create $app
 # ...
 #=================================================
 
+chown -R $app: $final_path
+
 pushd $final_path
 ynh_use_nodejs
 sudo -u $app env PATH=$PATH:$nodejs_path npm install "graphql@^0.13.1"