# Notes on upgrading various packages
## KaTeX
Look at https://github.com/sagemathinc/cocalc/pull/3313 and see **all** the places where the exact version of KaTeX is hardcoded in CDN url's, etc. Change them all at once!
## CodeMirror
Similar remarks to KaTeX. Beware!
# Testing
## Jest
The following must be upgraded together.
```
jest
ts-jest
@types/jest
```