diff --git a/scripts/upgrade b/scripts/upgrade
index 266aad5..6f64f86 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -3,5 +3,43 @@
 # Exit on command errors and treat unset variables as an error
 set -eu
 
+# See comments in install script
+app=phpsysinfo
+
 # Source YunoHost helpers
-. /usr/share/yunohost/helpers
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+. /usr/share/yunohost/helpers
+
+# Retrieve app settings
+domain=$(ynh_app_setting_get "$app" domain)
+path=$(ynh_app_setting_get "$app" path)
+admin=$(ynh_app_setting_get "$app" admin)
+is_public=$(ynh_app_setting_get "$app" is_public)
+
+# Remove trailing "/" for next commands
+path=${path%/}
+
+# Copy source files
+final_path=/var/www/$app
+sudo mkdir -p $final_path
+sudo cp -a ../sources/. $final_path
+
+# Set permissions to app files
+# you may need to make some file and/or directory writeable by www-data (nginx user)
+sudo chown -R root:root $final_path
+
+# Modify Nginx configuration file and copy it to Nginx conf directory
+sed -i "s@YNH_WWW_PATH@$path@g" ../conf/nginx.conf
+sed -i "s@YNH_WWW_ALIAS@$final_path/@g" ../conf/nginx.conf
+sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
+
+# If app is public, add url to SSOWat conf as skipped_uris
+if [[ $is_public -eq 1 ]];
+then
+  # See install script
+  ynh_app_setting_set "$app" unprotected_uris "/"
+  # Remove old settings
+  ynh_app_setting_delete "$app" skipped_uris
+fi
+
+# Restart services
+sudo service nginx reload
\ No newline at end of file