libpng containing a security vulnerability

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I am Using OPecnv in my app and published it on Play store but GOogle send me this mail pls help how to resolve this

ERROR:-

This information is intended for developers of apps that utilize any version of libpng library, that contains a security vulnerability disclosed in CVE-2015-8540. Apps with vulnerabilities like this can expose users to risk of compromise and may be considered in violation of our Malicious Behavior policy.

Please migrate your app(s) to libpng v1.0.66, v.1.2.56, v.1.4.19, v1.5.26 or higher as soon as possible and increment the version number of the upgraded APK. Beginning Sep 17, 2016, Google Play will block publishing of any new apps or updates that use vulnerable versions of libpng. Your published app version will remain unaffected, however any updates to the app will be blocked unless they address this vulnerability.