diff --git a/scripts/upgrade b/scripts/upgrade
new file mode 100755
index 0000000..3a5df89
--- /dev/null
+++ b/scripts/upgrade
@@ -0,0 +1,152 @@
+#!/bin/bash
+
+#=================================================
+# GENERIC START
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# LOAD SETTINGS
+#=================================================
+
+app=$YNH_APP_INSTANCE_NAME
+
+domain=$(ynh_app_setting_get $app domain)
+path_url=$(ynh_app_setting_get $app path)
+admin=$(ynh_app_setting_get $app admin)
+is_public=$(ynh_app_setting_get $app is_public)
+final_path=$(ynh_app_setting_get $app final_path)
+db_name=$(ynh_app_setting_get $app db_name)
+db_pwd=$(ynh_app_setting_get $app mysqlpwd)
+port=$(ynh_app_setting_get $app port)
+password=$(ynh_app_setting_get $app password)
+
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+
+# Fix is_public as a boolean value
+if [ "$is_public" = "Yes" ]; then
+	ynh_app_setting_set $app is_public 1
+	is_public=1
+elif [ "$is_public" = "No" ]; then
+	ynh_app_setting_set $app is_public 0
+	is_public=0
+fi
+
+# If db_name doesn't exist, create it
+if [ -z $db_name ]; then
+	db_name=$(ynh_sanitize_dbid $app)
+	ynh_app_setting_set $app db_name $db_name
+fi
+
+# If final_path doesn't exist, create it
+if [ -z $final_path ]; then
+	final_path=/opt/yunohost/$app
+	ynh_app_setting_set $app final_path $final_path
+fi
+
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# CHECK THE PATH
+#=================================================
+
+# Normalize the URL path syntax
+path_url=$(ynh_normalize_url_path $path_url)
+
+#=================================================
+# STANDARD UPGRADE STEPS
+#=================================================
+# DOWNLOAD, CHECK AND UNPACK SOURCE
+#=================================================
+
+# Download, check integrity, uncompress and patch the source from app.src
+ynh_setup_source "$final_path" $architecture
+
+#=================================================
+# NGINX CONFIGURATION
+#=================================================
+
+# Create a dedicated nginx config
+if [ "$path_url" != "/" ]
+then
+	ynh_replace_string "^#sub_path_only" "" "../conf/nginx.conf"
+fi
+
+ynh_add_nginx_config
+
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+
+# Create a dedicated user (if not existing)
+ynh_system_user_create $app
+
+#=================================================
+# SPECIFIC UPGRADE
+#=================================================
+
+### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
+### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
+ynh_backup_if_checksum_is_different "$final_path/config.yml"
+
+cp ../conf/config.yml "$final_path/config.yml"
+ynh_replace_string "__PORT__" $port "$final_path/config.yml"
+ynh_replace_string "__DBNAME__" $db_name "$final_path/config.yml"
+ynh_replace_string "__DBPASS__" $db_pwd "$final_path/config.yml"
+ynh_replace_string "__ADMINUSER__" $admin "$final_path/config.yml"
+ynh_replace_string "__ADMINPASS__" $password "$final_path/config.yml"
+ynh_replace_string "__DOMAIN__" $domain "$final_path/config.yml"
+
+# Recalculate and store the checksum of the file for the next upgrade.
+ynh_store_file_checksum "$final_path/config.yml"
+
+#=================================================
+# SETUP SYSTEMD
+#=================================================
+
+# Create a dedicated systemd config
+ynh_add_systemd_config
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+# SECURE FILES AND DIRECTORIES
+#=================================================
+
+# Set permissions on app files
+chown -R root: $final_path
+
+# If data directory doesn't exists, create it and setup permissions
+if [ -z $final_path/data ]; then
+	mkdir $final_path/data
+	chown -R $app $final_path/data
+fi
+
+#=================================================
+# SETUP SSOWAT
+#=================================================
+
+ynh_app_setting_set $app unprotected_uris "/"
+
+#=================================================
+# RELOAD NGINX
+#=================================================
+
+systemctl reload nginx