Text Column Modified to NVARCHAR(100) in the DIMENSION table in Sql Server 2008 and SSIS 2008

previously the TXT_ columns were VARCHAR datatype now there are records which need to have NVARCHAR data to store UTF-16 .

Update the Table definition will do , but there around 100 SSIS packages which need to be refresh with the new datatype DT_WSTR ,what is the best and easiest way to do it .