# How do I rebuild the Racket repository with changes to the Rumble layer?

**URL:** <https://racket.discourse.group/t/how-do-i-rebuild-the-racket-repository-with-changes-to-the-rumble-layer/2297>\
**Category:** Questions & Answers\
**Tags:** racket, rumble, build\
**Created:** [September 8, 2023, 6:49pm UTC](https://racket.discourse.group/t/how-do-i-rebuild-the-racket-repository-with-changes-to-the-rumble-layer/2297 "2023-09-08T18:49:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MartianMoorGrove](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/martianmoorgrove/32/965_2.png) [@MartianMoorGrove](https://racket.discourse.group/u/MartianMoorGrove)\
**Post date:** [September 8, 2023, 6:49pm UTC](https://racket.discourse.group/t/how-do-i-rebuild-the-racket-repository-with-changes-to-the-rumble-layer/2297/1 "2023-09-08T18:49:04Z")

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Running `make` at the top-level directory isn't enough, and I'm not finding much Rumble-specific guidance in the README files.

My change is a potential performance improvement in `hash.ss` that I'd like to try.