Patch ImageMagick on Heroku Create a new file on your project: .magick/policy.xml Add the following to its contents: <policymap> <policy domain="coder" rights="none" pattern="EPHEMERAL" /> <policy domain="coder" rights="none" pattern="URL" /> <policy domain="coder" rights="none" pattern="HTTPS" /> <policy domain="coder" rights="none" pattern="MVG" /> <policy domain="coder" rights="none" pattern="MSL" /> </policymap> Commit to Heroku (git commit -am "added imagemagick policy" && git push heroku master) Before ~ $ convert -list policy Path: [built-in] Policy: Undefined rights: None After ~ $ convert -list policy Path: [built-in] Policy: Undefined rights: None Path: /app/.magick/policy.xml Policy: Coder rights: None pattern: EPHEMERAL Policy: Coder rights: None pattern: URL Policy: Coder rights: None pattern: HTTPS Policy: Coder rights: None pattern: MVG Policy: Coder rights: None pattern: MSL
You can provide your own list of paths to policy files: https://help.heroku.com/RFDJQSG3/how-can-i-override-imagemagick-settings-in-a-policy-xml-file