You need to take a closer look at which version you are on. As long as there is no new beta release, the version name will not change. So, while 3.2.0.beta2 is in development, your version will continue to show as 3.2.0.beta2-dev. There are new commits every day, for example, the fix from yesterday.
You can find the exact version on your admin dashboard. Also, consider having a look at Find what version of Discourse you're using. It provides a helpful explanation about the exact GitHub commit.