Ruby : Rake Aborted : RMagick was Configured with ImageMagick of Different Version

when running rake on an existing ROR application, on my newly updated linux box, rake gets aborted and says RMagick was configured with ImageMagick of an old version but a new version is in use.

i thought of downgrading  my ImageMagick to make it work, but the version difference was more than one release. then i thought of downgrading to that specific ImageMagick version. but what if i need the latest version for other applications?

turns out, you can just reinstall the RMagick gem to have it configured to your current ImageMagick version. no more problemo :)