V3 update button in CP doesn't work

Hi everyone, I am a newbie web developer and I am trying out statamic 3 for the first time. It works pretty well already, but I have this problem that the composer update button doesn't work for me. It keeps saying "Could not open input file: vendor/bin/composer" but I checked that the file is accessible and that the symbolic link works. Does anyone know what could cause this? Thanks in advance.

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