# Racket upgrade (8.17) with Emacs racket-mode - the curse of racket-mode-start-faster

**URL:** <https://racket.discourse.group/t/racket-upgrade-8-17-with-emacs-racket-mode-the-curse-of-racket-mode-start-faster/3750>\
**Category:** Questions & Answers\
**Created:** [May 19, 2025, 5:03pm UTC](https://racket.discourse.group/t/racket-upgrade-8-17-with-emacs-racket-mode-the-curse-of-racket-mode-start-faster/3750 "2025-05-19T17:03:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![maueroats](https://avatars.discourse-cdn.com/v4/letter/m/c0e974/32.png) [@maueroats](https://racket.discourse.group/u/maueroats)\
**Post date:** [May 19, 2025, 5:03pm UTC](https://racket.discourse.group/t/racket-upgrade-8-17-with-emacs-racket-mode-the-curse-of-racket-mode-start-faster/3750/1 "2025-05-19T17:03:34Z")

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Install Racket 8.17 and now `emacs` won't start my Racket REPL. I did migrate everything from my previous version and did not touch the emacs config.

Suggestions?

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<div class="post-metadata">

**Author:** ![maueroats](https://avatars.discourse-cdn.com/v4/letter/m/c0e974/32.png) [@maueroats](https://racket.discourse.group/u/maueroats)\
**Post date:** [May 19, 2025, 8:42pm UTC](https://racket.discourse.group/t/racket-upgrade-8-17-with-emacs-racket-mode-the-curse-of-racket-mode-start-faster/3750/2 "2025-05-19T20:42:20Z")

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`racket-mode-start-faster` compiles the Racket files used by racket-mode. It needs to be re-run when you upgrade Racket.