$yum history
    Loaded plugins: fastestmirror, security
    ID     | Login user               | Date and time    | Action(s)      | Altered
    -------------------------------------------------------------------------------
        87 | root <root>              | 2013-05-14 06:07 | Update         |    5   
        86 | root <root>              | 2013-04-10 06:47 | Install        |    1   
        85 | root <root>              | 2013-04-10 06:47 | Install        |    1   


$yum history undo 86