Latest version is 6.0 while only 5.3.9 is available via F-Droid. The developer forgot to push the latest version of the App to GitHub but has done so a while back:https://github.com/T-Rex96/Easy_xkcd/issues/115
We don’t have the current version of this app. (Check mode: Tags ^release) (Auto-update mode: None)
The current (recommended) version is 6.0 (version code 139).