I have an Airport Express that I am trying to use connected by ethernet to my iMac G4 running Mac OS 10.4.11. I need to update the Airport software in order to use security option WPA2 Personal. I currently have Airport software v. 5.6.1.

I have an Airport Express that I am trying to use connected by ethernet to my iMac G4 running Mac OS 10.4.11. I need to update the Airport Express softwart in order to use security option WPA2 Personal to connect to the internet through my Airport Extreme. I currently have Airport Express software version 5.6.1. How can I update this software? (I can connect directly to my Airport Extreme by ethernet and download the update that way). Is a later version of A E software available for download anywhere? Any suggestions would be greatly appreciated.

Thanks.