The latest version is 4.8.1351.
What else has changed on your system recently ?
What avast processes are running in Task Manager, they begin with ash or asw, see image ?
Try a repair of avast. Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow. This has in the past resolved this out of sync issue between reported and actual VPS version.