yum を利用したパッケージの更新方法について

[root@localhost ~]# yum update bash
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: www.ftp.ne.jp
 * extras: www.ftp.ne.jp
 * updates: www.ftp.ne.jp
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package bash.x86_64 0:4.1.2-15.el6_4 will be updated
---> Package bash.x86_64 0:4.1.2-29.el6 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================
 Package             Arch                  Version                        Repository           Size
============================================================================
Updating:
 bash                x86_64                4.1.2-29.el6                   base                907 k

Transaction Summary
============================================================================
Upgrade       1 Package(s)

Total download size: 907 k
Is this ok [y/N]: y
Downloading Packages:
bash-4.1.2-29.el6.x86_64.rpm                                                           | 907 kB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Updating   : bash-4.1.2-29.el6.x86_64                                                                   1/2
  Cleanup    : bash-4.1.2-15.el6_4.x86_64                                                                 2/2
  Verifying  : bash-4.1.2-29.el6.x86_64                                                                   1/2
  Verifying  : bash-4.1.2-15.el6_4.x86_64                                                                 2/2

Updated:
  bash.x86_64 0:4.1.2-29.el6

Complete!