Version in version.php incorrect?

[eloo]

Hi,
i was just about to migrate from my local instance to your docker image and i'm running into a "downgrading" issue.
My local instance is running 15.0.6.1 and the docker image claims to be 15.0.5.3 (i'm using the nextcloud:15 image which i've pulled a few minutes ago).

Related to the dockerfile and the documentation the image version should be something like 15.0.7.x.
So i guess there is a bug in the version.php provided in the docker image. So i repulled the image and checked the content of the version.php and yes it claims to be 15.0.5.3.
The version.php of my local instance is having 15.0.6.1 as a version.

So is this a bug in the file? Or did i missed something?

Thanks