The vaultwarden server docker image contains the server itself and the web vault (basically the web interface to interact with the server). The command to see these versions:
docker exec -it vaultwarden ./vaultwarden --version
Vaultwarden 1.33.2
Web-Vault 2025.1.1
Just get the latest version. When updates are available I’ll usually wait a few days to be safe and get the latest.