The service is showing old jar dependencies as being up to date.
Looking at: https://versions.deps.co/dotemacs/pdfboxing it shows that all the dependencies are up to date.
But one of the dependencies pdfbox, is at 2.0.21, whereas in project.clj the version included is 2.0.19, see:
https://github.com/dotemacs/pdfboxing/blob/8d41ea38c621f2f4dfd6d0db6a4003766581448f/project.clj
Running lein ancient shows that the dependency really is out of date.