GitLab update script

I've recently installed GitLab and they provide easy to install deb and rpm packages but not a repository to help us keep our installation up to date. So I developed the following script that will check https://about.gitlab.com/downloads/archives/ for newer versions and install them when available:

#!/bin/bash
OS="ubuntu"
OS_Version="14.04"
OS_ARCHITECTURE="amd64"
# Ubuntu/Debian:
INSTALLED_VERSION=$(dpkg -s gitlab | grep -i version | cut -d" " -f2)
# CentOS:
#INSTALLED_VERSION=$(rpm -qa | grep omnibus)
# Uses sort -V to compare versions
LATEST=$(wget -q -O- https://about.gitlab.com/downloads/archives/ | grep -i "$OS" | grep -i "$OS_VERSION" | grep -i $OS_ARCHITECTURE | grep -Eo 'href=".*"' | cut -d'"' -f2 | sort -V | tail -n 1)
PACKAGE=${LATEST##*/}
LATEST_VERSION=$(echo $PACKAGE | cut -d_ -f2)
echo ""
echo " Current version: $INSTALLED_VERSION"
echo " Latest version: $LATEST_VERSION"
if [[ "$INSTALLED_VERSION" != "$LATEST_VERSION" && "$LATEST_VERSION" != "" ]]; then
    echo "    Update to $LATEST_VERSION available!"
    echo -n "     Do you wich to upgrade? [y/N]? "
    read answer
    case $answer in
        y*)
            # Backup branding:
            cp /opt/gitlab/embedded/service/gitlab-rails/public/assets/*logo*.png /tmp/
            wget $LATEST
            # Stop unicorn and sidekiq so we can do database migrations
            sudo gitlab-ctl stop unicorn
            sudo gitlab-ctl stop sidekiq
            # Create a database backup in case the upgrade fails
            sudo gitlab-rake gitlab:backup:create
            # Install the latest package
            # Ubuntu/Debian:
            sudo dpkg -i $PACKAGE
            # CentOS:
            #sudo rpm -Uvh $PACKAGE
            # Restore branding:
            sudo cp /tmp/*logo*.png /opt/gitlab/embedded/service/gitlab-rails/public/assets/
            # Reconfigure GitLab (includes database migrations)
            sudo gitlab-ctl reconfigure
            # Restart all gitlab services
            sudo gitlab-ctl restart
            rm $PACKAGE
        ;;
        *)
            echo "No change"
        ;;
    esac
else
    echo "    Nothing to do!"
fi
echo ""

I haven't tested this script on a CentOS machine so it might need some adjustments to work there.