A new update is available for Fedora Core - Fedora Core 4 Update: squid-2.5.STABLE11-1.FC4. Here the announcement:

Fedora Update Notification
FEDORA-2005-913
2005-09-23
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Product : Fedora Core 4
Name : squid
Version : 2.5.STABLE11
Release : 1.FC4
Summary : The Squid proxy caching server.
Description :
Squid is a high-performance proxy caching server for Web clients,
supporting FTP, gopher, and HTTP data objects. Unlike traditional
caching software, Squid handles all requests in a single,
non-blocking, I/O-driven process. Squid keeps meta data and especially
hot objects cached in RAM, caches DNS lookups, supports non-blocking
DNS lookups, and implements negative caching of failed requests.

Squid consists of a main server program squid, a Domain Name System
lookup program (dnsserver), a program for retrieving FTP data
(ftpget), and some management and client tools.

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* Fri Sep 23 2005 Martin Stransky <stransky@redhat.com> 7:2.5.STABLE11-1.FC4
- update to STABLE11


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

cabc06f38a17007ae57a441e26454152 SRPMS/squid-2.5.STABLE11-1.FC4.src.rpm
ca16da2aaee587b8e07711d22b81e960 ppc/squid-2.5.STABLE11-1.FC4.ppc.rpm
0e15866c9b28cbf831ee20bed30b9e03 ppc/debug/squid-debuginfo-2.5.STABLE11-1.FC4.ppc.rpm
2db7a409b7cf294ad7dd4012adc7d80a x86_64/squid-2.5.STABLE11-1.FC4.x86_64.rpm
89571449841a07b3e7d7c3b9c2258e94 x86_64/debug/squid-debuginfo-2.5.STABLE11-1.FC4.x86_64.rpm
ecc2c9316de4052a728cc0581789b80e i386/squid-2.5.STABLE11-1.FC4.i386.rpm
553ee974c9727d980a1eafc051f6f197 i386/debug/squid-debuginfo-2.5.STABLE11-1.FC4.i386.rpm

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