Google has updated its infamous Hangouts to version 5.0 and users can download the latest version but the users cannot find any user interface changes or any huge front-facing changes as of now unlike the earlier updates. Reportedly this update is aimed at the improving of performance and the user interface and also making the software as bug-free as possible.
Android Authority claims that the users who have updated to the new version can now play the GIFs properly in conversation mode, MMS text is supported for Google Voice in Hangouts, and you should find that the software will no longer randomly scroll on its own. This update provides the MMS/Google Voice support to return to hangouts. Already the update is available in the Google Play Store or else you may grab through APK.
Source: Android Authority