why would Heroku re-install all gems on Nth deployment with same gems?

Question

I did a push to Heroku, modified a little code (but no gem and no asset changes) and then pushed again.

The second time, the deploy messages indicated all the gem were 'installed' instead of saying 'using' the prior gems.

Why might Heroku re-install all the gems when none changed?

Maybe a ruby version change? Could you paste the full deployment output which reinstalled those gems? — Damien MATHIEU, Sep 18 '15 at 08:26
good call, they bumped from 2.0.0p645 to p647, happy to accept if you enter as an answer — jpw, Sep 22 '15 at 05:52

score 1 · Accepted Answer · answered Sep 22 '15 at 06:06

1

Heroku will update all gems if your version of ruby has changed.
That is because some can compile C binaries, which would then not be compatible with earlier versions of ruby, and therefore need to be reinstalled.

answered Sep 22 '15 at 06:06

Damien MATHIEU

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why would Heroku re-install all gems on Nth deployment with same gems?

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