Time Zone version TZ_VERSION after upgrade to 11g

Hi ,

After upgrade to 11g , TIME ZONE (TZ_VERSION)  is equal to 3 ( not 4 ?) , is it OK  ?

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.3.0
Connected as user_dba
 
SQL> select * from sys.registry$database ;
 
PLATFORM_ID PLATFORM_NAME                  EDITION   TZ_VERSION
----------- ------------------------------                        ---------        ----------
          6 AIX-Based Systems (64-bit)                                     3         

Best regards.

GD.