A new update is available for Fedora Core - Fedora Core 3 Update: ruby-1.8.3-1.fc3. Here the announcement:

Fedora Update Notification
FEDORA-2005-925
2005-09-26
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Product : Fedora Core 3
Name : ruby
Version : 1.8.3
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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* Mon Sep 26 2005 Akira TAGOH <tagoh@redhat.com> - 1.8.3-1.fc3
- New upstream release.
- Build-Requires xorg-x11-devel instead of XFree86-devel.
- ruby-multilib.patch: applied for only 64-bit archs.
- ruby-1.8.2-xmlrpc-CAN-2005-1992.patch: removed. it has already been in upstream.


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

7091810b48d485a7d39a3084434f05b7 SRPMS/ruby-1.8.3-1.fc3.src.rpm
8888b7b4b158287c9b37ccbd03e0aff2 x86_64/ruby-1.8.3-1.fc3.x86_64.rpm
9e300e04014cedce2820941113d6306a x86_64/ruby-libs-1.8.3-1.fc3.x86_64.rpm
6ff0722bbfcf4a3d1a94c3f3ce69e09b x86_64/ruby-devel-1.8.3-1.fc3.x86_64.rpm
745e1a9f93f1a887d97e837eeaaeead4 x86_64/ruby-tcltk-1.8.3-1.fc3.x86_64.rpm
8b109da3dbd58f950f7b6b2c0d34f51f x86_64/irb-1.8.3-1.fc3.x86_64.rpm
503f9218383d4a3a3ee4d33ff3106b8d x86_64/rdoc-1.8.3-1.fc3.x86_64.rpm
77deb05ef66cf2a2619ebf4a30382105 x86_64/ruby-docs-1.8.3-1.fc3.x86_64.rpm
0ed15683cd1e18e36fb2011214603fad x86_64/ruby-mode-1.8.3-1.fc3.x86_64.rpm
c648bf63395a252c26f6184809b22713 x86_64/ri-1.8.3-1.fc3.x86_64.rpm
2ab086aa34631908c8cb91cb77d28a14 x86_64/debug/ruby-debuginfo-1.8.3-1.fc3.x86_64.rpm
f798e4d8adc250041c38194c9f64d1f5 x86_64/ruby-libs-1.8.3-1.fc3.i386.rpm
137d1897d3510c5949dacd2129c1115e i386/ruby-1.8.3-1.fc3.i386.rpm
f798e4d8adc250041c38194c9f64d1f5 i386/ruby-libs-1.8.3-1.fc3.i386.rpm
593ab4c5abd6742cd199253939e601c4 i386/ruby-devel-1.8.3-1.fc3.i386.rpm
aa8314dfe654b3fcda15ce55efc6eb8f i386/ruby-tcltk-1.8.3-1.fc3.i386.rpm
73226a6169ceb76bc97bce30be6627f0 i386/irb-1.8.3-1.fc3.i386.rpm
5d4452f228fdd302719b9a04b3ed8653 i386/rdoc-1.8.3-1.fc3.i386.rpm
9c7ece6595d1669b41cc414b1b20b7d4 i386/ruby-docs-1.8.3-1.fc3.i386.rpm
fecdf0c4becd809f39077c20211fca24 i386/ruby-mode-1.8.3-1.fc3.i386.rpm
678c89c106e9700ad76b5f7b8552e77b i386/ri-1.8.3-1.fc3.i386.rpm
7a73494b79ef19bf90100418e6496075 i386/debug/ruby-debuginfo-1.8.3-1.fc3.i386.rpm

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