Modded apps do not receive official updates from the Google Play Store. You will have to manually find and install a new APK whenever a new version is released.
Modified binaries often suffer from instability. Removing advertisement libraries improperly can cause null pointer exceptions, leading to application crashes. Furthermore, the lack of access to the official Google Play Services update mechanism leaves users with outdated lexical data and unpatched security vulnerabilities. longman-dictionary-mod-apk