You should never use an outdated version.
Your version (2.8.3) is vulnerable to an RPC exploit [1] (which under some circumstances can lead to a loss of your funds if your wallet is not password protected).
You need to make sure your system is up-to date to keep your system/funds secured.
Always update your OS, AV, java, flash, ... If you don't you run the risk of losing funds in the long term (the odds are against you).
[1]
https://github.com/spesmilo/electrum-docs/blob/master/cve.rst