Oracle Database Discussions

I have a object type as shown below:

Below is the Object and its type

create or replace type test_object1 as object
(
val1 varchar2(50),
val2 varchar2(50),
val3 varchar2(50)
);

create or replace type test_type1 is table of test_object1;


Now I would like to alter the object type. I want to increase the size of val1 to varchar2(100).

Could any body help for the alter script.

Thanks,
Lavan