Mysql – Yum issues after upgrading MySQL from 5.0 to 5.5 on RHEL

I'm running RHEL 5.6 and trying to upgrade MySQL from 5.0 to 5.5. I ran sudo yum remove mysql* to remove all the existing MySQL-related packages.

Then I installed MySQL 5.5 packages:

$ sudo yum install mysql55*
Loaded plugins: downloadonly, rhnplugin, security
Excluding Packages in global exclude list
Finished
Setting up Install Process
Package mysql55-embedded-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-server-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-test-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-devel-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-bench-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-embedded-devel-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-libs-5.5.22-1.ius.el5.x86_64 already installed and latest version
Package mysql55-debuginfo-5.5.22-1.ius.el5.x86_64 already installed and latest version

When I check the list of packages it tells me I still have 5.0:

$ sudo yum list mysql
Loaded plugins: downloadonly, rhnplugin, security
Excluding Packages in global exclude list
Finished
Available Packages
mysql.i386                             5.0.77-4.el5_6.6                           rhel-x86_64-server-5.6.z
mysql.x86_64                           5.0.77-4.el5_6.6                           rhel-x86_64-server-5.6.z

But when I check the MySQL client and server I do seem to be running 5.5:

$ mysql -V
mysql  Ver 14.14 Distrib 5.5.22, for Linux (x86_64) using readline 5.1

$ tail /var/log/mysqld.log
Version: '5.5.22-log'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  Distributed by The IUS Community Project

Q: How can I fix yum to properly reflect the newly installed packages?