insmod: ERROR: could not insert module 8188eu.ko: Invalid module format

I'm trying to use the TL-WN725N as an USB WiFi-Adapter with Fedora 20.

I followed these insructions and the adapter worked fine and even survived two updates during the last few weeks.

Then I did a yum update today, and it still worked fine until I restarted my computer. I tried to reload the module and got insmod: ERROR: could not insert module 8188eu.ko: Invalid module format.

What I found out was, that my kernel and the kernel-headers in the module are not the same anymore and that I had to update the kernel, so I did that and got

sudo yum install kernel-headers
Loaded plugins: langpacks, refresh-packagekit
Package kernel-headers-3.17.3-200.fc20.x86_64 already installed and latest version
Nothing to do

Now I am a bit puzzeld about how to get the module to load properly. Anyone got any idea?