Problem with updating hstore extension from 9.2 to 9.3

Hello,

I've just upgraded my database from 9.2.2 to 9.3.0 using pg_upgrade.
Besides I've updated hstore extension ("alter extension hstore update").
But I can't find new to 9.2 hstore functions such as "hstore_to_json" in my
database.

I found out that file "contrib/hstore/hstore.control" of pg 9.3 is
identical to 9.2 one. And there is no file like "hstore--1.1--1.2.sql".

Is there a miss of update files for hstore?

Thanks in advance.

--
Regards
Murat Kabilov