# Firefly is now using yarn as a package manager

**URL:** <https://www.rubin.community/t/firefly-is-now-using-yarn-as-a-package-manager/1729>\
**Category:** Camera-DM Visualization\
**Created:** [March 17, 2017, 4:50pm UTC](https://www.rubin.community/t/firefly-is-now-using-yarn-as-a-package-manager/1729 "2017-03-17T16:50:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tatianag](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/tatianag/32/121_2.png) [@tatianag](https://www.rubin.community/u/tatianag)\
**Post date:** [March 17, 2017, 4:50pm UTC](https://www.rubin.community/t/firefly-is-now-using-yarn-as-a-package-manager/1729/1 "2017-03-17T16:50:17Z")

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Thank you for bringing it up during the meeting. We have replaced `npm` package manager with `yarn`.

Installing `yarn` is a recently added prerequisite added to Firefly build process. The README on [Firefly Github](https://github.com/Caltech-IPAC/firefly) site was updated with this new requirement. Install yarn via npm: `npm install yarn -g`. The benefits of this update are the consistent versioning and the decrease in build time. On average, we see a 30-40 percent gain in build speed.