I wanted to install the BASH patch, but the install failed, saying it had to be applied to OSX 10.9.5. But I installed that last week. Looking in the App Store, it clearly says that 10.9.5 was installed on 25th September 2014, but the "About this Mac" box says I'm at 10.9.4:
I have restarted the machine since the update was installed. Any ideas?