How to update Xibo?

I did that, but the version remains 2.3.0-alpha.

I made a script that simplifies the update process a bit.
Could you take a look at the code and see if the commands are correct?
No error messages is recieved during the process, and docker responds to the docker-compose down and docker-compose up -d just fine.

Update script:

#!/bin/bash
clear
echo "Update Xibo:"
read -p 'URL to tar.gz: ' targzurl

echo "Backing up old Xibo files. This could take a few minutes..."

cd
cd ..
rm -r _xibo-cms
cp -R /xibo-cms /_xibo-cms

cd /xibo-cms

echo "Backup complete!"

echo "Downloading and extracting $targzurl"
wget -c $targzurl -O - | tar -xz

echo "Shutting down Xibo"
docker-compose down

echo "Updating Xibo"
docker-compose up -d

echo "Update done!"

The url for tar.gz that I used was:
https://github.com/xibosignage/xibo-cms/releases/download/2.2.2/xibo-docker.tar.gz