TS4 update version on PS3

[silverwhalle]

i recently bought TS4. and some days after getting PSN account, TS4 was updated.
the updated version was harder for me to beat CPU than it was.
anyway, how to check the update version? i want to check if it's very recent version or not.

i searched internet for the messages appeared when it's updated. and i noticed it's Top Spin 4 Balancing Update #4 (9/19/2011).
is it the latest version? and what is the numeric value of the version? and how to check?