How to fix libpng vulnerability for Play Store

Hi, I'm using OpenCV threw another library (scanlibrary) in an android app. For few weeks Play Store tell me that my APKs are not secure. I searched over the Internet for an answer that works with my code, but for instance nothing works. I downloaded OpenCV 3.1.0 and copy/paste the three folder of sdk (etc, data & native) following the main ideas found on Internet. But this is not working, Play store keep telling me the vulnerability issue. I am wondering if there is something else to do ( a compilation of the ne content of jdk) , is there ? I have some more files in the scanlibrary as *.mk , *.h, *.cpp or *.so files that i supposed are compiled? So need I to compile? Thanks for help. Have all a good day.