Uđi u Market / Play store, desni touch tipka na settings i vidjet češ build verziju.
edit.
Da to je to, prestaru verziju imaš. Trenutna je 3.9.16
edit 2
trebaš
Go to Settings>Apps>All>Google Play Store>Clear Cache & Clear Data
Then
Go to Settings>Accounts & Sync> your Google account> click menu (the three dots)> Remove Google Account
Finally
Add your Google Account again.
DONE!