Update Apache HttpComponents libraries

I'm using ReadyAPI! 1.3.0 with SoapUI NG and SoapUI 5.0.0 both. ReadyAPI for some added functionality and SoapUI because it performs much better on my hardware (the difference is humongous). I'm using a couple of custom JARs which I added to the extension folder. One of them is working fine, the other one only works in ReadyAPI. This is caused by the Apache HttpComponents libraries SoapUI and ReadyAPI both use. For example, SoapUI uses HttpClient 4.1.1 and ReadyAPI uses HttpClient 4.3.1 . I need 4.3+ for my custom JAR to work.

I have tried to replace the HttpClient library in the lib folder and I have tried to load it as a custom JAR in the extensions folder, but no improvement. Is there a way I can use a newer version of the Apache HttpComponents libraries, or can you update the libraries in a next release?

As I'm bound to the hardware I'm using now, ReadyAPI is not an option at the moment.