A new update is available for Fedora Core - Fedora Core 3 Update: ruby-1.8.4-1.fc3. Here the announcement:

Fedora Update Notification
FEDORA-2005-000
2006-01-05
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Product : Fedora Core 3
Name : ruby
Version : 1.8.4
Release : 1.fc3
Summary : An interpreter of object-oriented scripting language
Description :
Ruby is the interpreted scripting language for quick and easy
object-oriented programming. It has many features to process text
files and to do system management tasks (as in Perl). It is simple,
straight-forward, and extensible.

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* Wed Jan 4 2006 Akira TAGOH <tagoh@redhat.com> - 1.8.4-1
- New upstream release.
- Kernel module ri documents are available.
- ruby-1.8.2-strscan-memset.patch: removed.
- moved the documents from ruby-libs to ruby-docs, which contains the arch
specific thing and to be multilib support.


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/3/

760cdd486ec11bb812d9671261420b2f SRPMS/ruby-1.8.4-1.fc3.src.rpm
a8d0f36de1947d6416ceaa386cfbd477 x86_64/ruby-1.8.4-1.fc3.x86_64.rpm
de2cf0b4cad86be03fb9467a3e09cfc0 x86_64/ruby-libs-1.8.4-1.fc3.x86_64.rpm
5a29f7e8ec18852d714ff694b6078a42 x86_64/ruby-devel-1.8.4-1.fc3.x86_64.rpm
e6b8af3877a184b124d27b880aa1f8c0 x86_64/ruby-tcltk-1.8.4-1.fc3.x86_64.rpm
dbfa4cd0d6d5bccb7e03d9770bedeedb x86_64/irb-1.8.4-1.fc3.x86_64.rpm
4c8f87713b973f5696fc54d1529face6 x86_64/rdoc-1.8.4-1.fc3.x86_64.rpm
3dc130dc2ca85c0e34eea5d7c8677c90 x86_64/ruby-docs-1.8.4-1.fc3.x86_64.rpm
25cfbdc461a7224b4f2ed6908d65a121 x86_64/ruby-mode-1.8.4-1.fc3.x86_64.rpm
011b298171dcd26f4df07acedb47aeef x86_64/ri-1.8.4-1.fc3.x86_64.rpm
dbb6cc13477efb084185dcdbbf7b5e05 x86_64/debug/ruby-debuginfo-1.8.4-1.fc3.x86_64.rpm
915e37c586f134f07cececb2468c839c x86_64/ruby-libs-1.8.4-1.fc3.i386.rpm
e2ec0ed39c0050f145d1066d88497650 i386/ruby-1.8.4-1.fc3.i386.rpm
915e37c586f134f07cececb2468c839c i386/ruby-libs-1.8.4-1.fc3.i386.rpm
a66a2cc46973130f2e7483ab2328db24 i386/ruby-devel-1.8.4-1.fc3.i386.rpm
8b140b1160d2159fe62adf9cb0b48f3b i386/ruby-tcltk-1.8.4-1.fc3.i386.rpm
ac812a70a46480e48ddc3d27491d1558 i386/irb-1.8.4-1.fc3.i386.rpm
b11f3778b943901107796dd6388f1634 i386/rdoc-1.8.4-1.fc3.i386.rpm
83b574be52db048729c6e2f27cadb99a i386/ruby-docs-1.8.4-1.fc3.i386.rpm
1061e2d31459d187b50643b741e94934 i386/ruby-mode-1.8.4-1.fc3.i386.rpm
4512485eaf66263590265bdfa1bb1d73 i386/ri-1.8.4-1.fc3.i386.rpm
1c4ecec298cda67a5aec4dfadf5c2673 i386/debug/ruby-debuginfo-1.8.4-1.fc3.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.