If I were Takoyaki Mask I would have written a prose but sadly I
am not, so let me tell in brief.  Here you are the Ruby 1.8.7's
most recent update.  Mainly bugfixes.      

ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p330.tar.gz
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p330.tar.bz2
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p330.zip

Checksums:

MD5(ruby-1.8.7-p330.tar.gz)= 50a49edb787211598d08e756e733e42e
SHA256(ruby-1.8.7-p330.tar.gz)= 6c261a463b5ffce1dc0920c980218379479dbdf94866d5ed53f1c71f1407c561
SIZE(ruby-1.8.7-p330.tar.gz)= 4873383

MD5(ruby-1.8.7-p330.tar.bz2)= 2689719fb42c8cf0aa336f8c8933f413
SHA256(ruby-1.8.7-p330.tar.bz2)= 486c73b023b564c07e062e2e61114e81de970913b04fac6798d0fbe8b7723790
SIZE(ruby-1.8.7-p330.tar.bz2)= 4191156

MD5(ruby-1.8.7-p330.zip)= 537d424438a0fefe40bed91b022592d6
SHA256(ruby-1.8.7-p330.zip)= 18df0d26d10a9be32275ba7b39ffd222a153fcc4669e4b772eab142d7e7bde90
SIZE(ruby-1.8.7-p330.zip)= 5972777


It is worth noting that, though Ruby project experienced license
change recently (from GPLv2 to 2-clause BSDL) and this is the
first time since then to release something, that change do not
reach to already-released versions like 1.8.7, matz said to us.
So you do not have to worry about it.  If you are already using
1.8.7, you can continue using it.

Thank you, happy holidays.