"svn upgrade" does nothing

Hello,

I'm having a weird issue with subversion: Every command is interrupt with
this:

svn: E155036: Please see the 'svn upgrade' command
svn: E155036: The working copy at '/home/jabiason/{work}' is too old
(format 10) to work with client version '1.8.10 (r1615264)' (expects format
31). You need to upgrade the working copy first.

I run svn upgrade (even multiple times) but the problem still happens.

As a temporary solution, I checked the source out in a different directory,
but there is a little snag: For my reluctance in commiting mid change,
there are some files that are not part of the repo yet but I can't see them
because "svn st" is interrupted mid processing with the error above.

svn --version
svn, version 1.8.10 (r1615264)
   compiled Aug 20 2014, 08:13:28 on x86_64-redhat-linux-gnu

(It is the default subversion packaged by Fedora, btw).

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