Timezone file for 11g, version 1 ok?

 I've migrated my Oracle 9i databases to Oracle 11g r2.  As far as I can tell from the documentation, Oracle 11g supports timezone version 1.  My 11g database currently shows version 1 timezone: SQL> select * from v$timezone_file;

FILENAME                VERSION
-------------------- ----------
timezlrg_1.dat                1

Question: will being at version 1 timezone cause me any issues if I'm not using multiple timezones and if so, do you recommend I upgrade my timezone version and what documents do you recommend I follow for this process?

Thanks, Mike