adding them to the list of prereqs will trigger a circular dependency

It's only a problem if those prereqs themselves specify a version of Log::ger that's newer than the Log::ger that's currently installed. (And there must be a Log::ger that's "currently installed", or the "list of prereqs" would be empty.)
So, I guess that's the issue.

IIUC, your question could therefore be generalized as:
"How do I, as maintainer of both the Foo and Bar modules, ensure that Bar, which is dependant upon Foo, is automatically updated whenever Foo is updated ?"
Maybe just bundle Foo and Bar into the same distro ? (I think that would be the "approved" method, though I wouldn't like to assert that it's always desirable.)

Other than that, I can't really think of anything that hasn't already been mentioned.

Cheers,
Rob

In reply to Re^3: Update these modules if installed? by syphilis
in thread Update dependants if installed (was: Update these modules if installed?) by perlancar

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