You should receive the new version when you start your client. Most of the improvements are on antihack side.
There is also a new log message when gproxy update time exceeds 40ms so if you see a lot of these messages in your logs, report them to me.
The message looks like this:
Total update took a bit too long (ms)
edit: It seems that some players have performance issues, I will try to release an optimized version tomorrow to reduce the lag.