How's is the above code "not working"? I'm pretty sure as long as your resultset isn't empty $rs->update({field1 => 55, field2 => 'field2+1' }); will work.
Now, if you mean 'field2+1' isn't working, you may want to use something like
my $field2 = $rs->field1 + 1;
$rs->update({field1 => 55, field2 => $field2 });
(Untested).
HTH!
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