The update process depends on how you originally installed Newt. Find the lates version in the GitHub releases.

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Docker Installation

Update the image version in your docker-compose.yml:
docker-compose.yml
services:
  newt:
    image: fosrl/newt:{version} #  Replace {version} with the latest version tag
    # ... rest of config
Then pull and restart: 
docker compose pull newt
docker compose up -d newt

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Binary Installation

If you used the auto installer, simply run it again. 
curl -fsSL https://digpangolin.com/get-newt.sh | bash

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Manual Installation

Download the latest binary for your system from GitHub releases and replace your existing binary. 
wget -O newt "https://github.com/fosrl/newt/releases/download/{version}/newt_{architecture}" && chmod +x ./newt
Replace {version} with the desired version and {architecture} with your architecture. Check the release notes for the latest information.