diff --git a/scripts/upgrade b/scripts/upgrade
new file mode 100644
index 0000000..2cd1b35
--- /dev/null
+++ b/scripts/upgrade
@@ -0,0 +1,72 @@
+#!/bin/bash
+
+# Exit on command errors and treat unset variables as an error
+set -eu
+
+# See comments in install script
+app=$YNH_APP_INSTANCE_NAME
+
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
+
+# Retrieve app settings
+domain=$(ynh_app_setting_get "$app" domain)
+path_url=$(ynh_app_setting_get "$app" path_url)
+is_public=$(ynh_app_setting_get "$app" is_public)
+
+# Remove trailing "/" for next commands
+path_url=${path_url%/}
+
+# Copy source files
+src_path=/var/www/$app
+sudo rm -r $src_path
+sudo mkdir -p $src_path
+sudo cp -a ../sources/. $src_path
+
+# Retrieve database settings
+dbuser=$app
+dbname=$app
+dbpass=$(yunohost app setting $YNH_APP_INSTANCE_NAME mysqlpwd)
+
+# Adding the details of the database to the config file
+sed -i "s@__dbuser__@$dbuser@g" ../conf/config.ini.php
+sed -i "s@__dbpass__@$dbpass@g" ../conf/config.ini.php
+sed -i "s@__dbname__@$dbname@g" ../conf/config.ini.php
+
+# Copy the config file to the src_path
+sudo cp ../conf/config.ini.php $src_path/data/.
+
+# 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: $src_path
+
+# Modify Nginx configuration file and copy it to Nginx conf directory
+nginx_conf=../conf/nginx.conf
+sed -i "s@YNH_WWW_PATH@$path_url@g" $nginx_conf
+sed -i "s@YNH_WWW_ALIAS@$src_path/@g" $nginx_conf
+# If a dedicated php-fpm process is used:
+#
+# sed -i "s@YNH_WWW_APP@$app@g" $nginx_conf
+sudo cp $nginx_conf /etc/nginx/conf.d/$domain.d/$app.conf
+
+### PHP (remove if not used) ###
+# If a dedicated php-fpm process is used:
+# # Modify PHP-FPM pool configuration and copy it to the pool directory
+# sed -i "s@YNH_WWW_APP@$app@g" ../conf/php-fpm.conf
+# sed -i "s@YNH_WWW_ALIAS@$src_path/@g" ../conf/php-fpm.conf
+# finalphpconf=/etc/php5/fpm/pool.d/$app.conf
+# sudo cp ../conf/php-fpm.conf $finalphpconf
+# sudo chown root: $finalphpconf
+# sudo chmod 644 $finalphpconf
+# sudo service php5-fpm restart
+### PHP end ###
+
+# 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 "/"
+fi
+
+sudo chmod -R 777 $src_path/data
+# Reload nginx service
+sudo service nginx reload