The minimum API has been bumped to 23 (Android 6.0, Marshmallow). This was because Google stopped releasing security updates for Android System WebView on devices older than API 23, making it impossible to provide a secure browsing experience. At any point, you can see the lowest version of the OS that receives WebView updates by checking the list of variants on APKMirror. In the future, as WebView support drops older versions of Andriod, Privacy Browser will follow suit.
A bug was fixed when using a scrolling app bar on the bottom of the screen that sometimes caused it to not be able to scroll back onto the screen. As part of the fix, there is now an animation to the scrolling of the bottom app bar, which adds a delay that helps prevent jitter when pages are scrolled up and down too quickly.
Another bug was fixed that sometimes caused a new tab opened by an intent (from another app) to display the content of a previous tab.
The links inside the app have been updated to adjust for changes to the website relating to Privacy Browser PC. Some redundant drawables have also been removed now that the minimum API is 23, as the tint color can be automatically changed between day and night mode.