/boot space low after upgrade to 175

Hi !

after upgrading from last core to actual (175) ipfire croaks about low diskspace in /boot.

at the beginning (years ago) i made a standart installation on an APU 2C3 and the size of /boot is around  50 MB

/dev/sda1                          58298      51414       3812 94% /boot

Is there a way to get rid of this problem w/o disassembling the device (as you might know this APU does not have a vga) ?

Ciao Gerd