Upgrade from 8.4.13 to 9.2.0.1 successful but it still displays 8.4.13 if SELECT version();

Hi,

I have upgraded postgresql 8.4.13 to 9.2.0.1 O/S Ubuntu, restarted postgresql, it displayed my postgresql is 9.2 but
whenI log into postgresql, show version, it is still 8.4.13, see a) and b) below,  

a)
* Restarting PostgreSQL 9.2 database server
   ...done.


b)
psql (8.4.13)
Type "help" for help.
postgres=# SELECT version();
                                                   version
--------------------------------------------------------------------------------------------------------------
 PostgreSQL 8.4.13 on i486-pc-linux-gnu, compiled by GCC gcc-4.4.real (Ubuntu 4.4.3-4ubuntu5.1) 4.4.3, 32-bit
(1 row)




Anything I have missed in my upgrade? please help.
Regards
Arthur