Hi Aleksey,
I don't think there should be any problem upgrading. I will give it a try myself and if it seems ok I'll commit to trunk in the next few days.
Even if you replaced it in the _libs folder it still might be using the old version in the Web/bin folder, so be sure any copy it there too for testing. Let me know if you do encounter any troubles. I need to test it also with my paid products Event Calendar Pro and Form Wizard Pro, which both use this library.
Best,
Joe