TDS Protocol Version

I'm almost certain that people have already faced this problem but i cannot
find it out in the history.

Problem:
======
I want my application to open TDS 7.2 / TDS7.3 / TDS 7.4 connection to the
SQL server 2012/2008 but it always opens TDS 7.0 or TDS 7.1 depending upon
the definition of "tds version" in freetds.conf. e.g. if i define "tds
version" as 7.0, 7.0 connection gets opened. If i define "tds version" as
7.1, 7.1 connections gets opened. But, if i define "tds version" as 7.2 or
greater, it still opens 7.1 connection. I have also tried putting in "8.0"
for the "tds version" but that does not fix it.

I have freetds v0.91 installed on CentOS 6.4.

Am i missing something here ?

Thanks,
Vipul