[root@linux ~]# yum check-update　←　インストール済でアップデート可能なRPMパッケージ検索
Setting up Repo:  base
repomd.xml                100% |=========================| 1.1 kB    00:00
Setting up Repo:  updates-released
repomd.xml                100% |=========================|  951 B    00:00
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 797 kB    00:03
MD Read   : ################################################## 2623/2623
base      : ################################################## 2622/2622
primary.xml.gz            100% |=========================|  75 kB    00:04
MD Read   : ################################################## 182/182
updates-re: ################################################## 182/182

以下がインストール済でアップデート可能なRPMパッケージ
httpd.i386                               2.0.52-3.1             updates-released
httpd-suexec.i386                        2.0.52-3.1             updates-released

[root@linux ~]# rpm -q httpd　←　httpdパッケージアップデート前バージョンチェック
httpd-2.0.52-3　←　インストール済httpdパッケージのバージョンは2.0.52-3

[root@linux ~]# yum -y update httpd　←　httpdパッケージアップデート
Setting up Update Process
Setting up Repo:  base
repomd.xml                100% |=========================| 1.1 kB    00:00
Setting up Repo:  updates-released
repomd.xml                100% |=========================|  951 B    00:00
Reading repository metadata in from local files
base      : ################################################## 2622/2622
primary.xml.gz            100% |=========================|  83 kB    00:01
MD Read   : ################################################## 207/207
updates-re: ################################################## 207/207
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for httpd to pack into transaction set.
httpd-2.0.52-3.1.i386.rpm 100% |=========================|  58 kB    00:01
---> Package httpd.i386 0:2.0.52-3.1 set to be updated
--> Running transaction check
--> Processing Dependency: httpd= 2.0.52-3 for package: httpd-suexec
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for httpd-suexec to pack into transaction set.
httpd-suexec-2.0.52-3.1.i 100% |=========================|  18 kB    00:00
---> Package httpd-suexec.i386 0:2.0.52-3.1 set to be updated
--> Running transaction check

Dependencies Resolved
Transaction Listing:
  Update: httpd.i386 0:2.0.52-3.1

Performing the following to resolve dependencies:
  Update: httpd-suexec.i386 0:2.0.52-3.1
Downloading Packages:
httpd-2.0.52-3.1.i386.rpm 100% |=========================| 881 kB    00:04
httpd-suexec-2.0.52-3.1.i 100% |=========================|  24 kB    00:00
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Updating: httpd-suexec 100 % done 1/4
Updating: httpd 100 % done 2/4
Completing update for httpd  - 3/4
Completing update for httpd-suexec  - 4/4

Updated: httpd.i386 0:2.0.52-3.1
Dependency Updated: httpd-suexec.i386 0:2.0.52-3.1
Complete!

[root@linux ~]# rpm -q httpd　←　httpdパッケージアップデート後バージョンチェック
httpd-2.0.52-3.1　←　httpdパッケージが2.0.52-3⇒2.0.52-3.1にアップデートされた