Heroku 16 Imagemagick Buildpack

Problem

I'm working on a project that requires imagemagick to work on the Heroku 16 stack. When using the buildpack, I get the following error:

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libgvc.so.6: cannot open shared object file: No such file or directory

Solution

I was able to fix the problem by including the GraphViz buildpack. In order to get Imagemagick working on Heroku-16 you need to add the imagemagick and GraphViz buildpacks to your project.