Take a backup of your Portainer configuration first.
After backing up your Portainer, stop and remove the Portainer container.
docker stop portainer
docker rm portainer
Now, pull the latest Portainer image using the following command.
docker pull portainer/portainer-ce:latest
Finally, deploy your portainer instance again.
docker run -d -p 8000:8000 -p 9443:9443 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest