How do i avoid updating other packages while doing an install in a monorepo?

[arshad-shah]

Hi,

I recently started work on updating our monorepo (500+ packages) from pnpm 8 to pnpm 9 mainly for the catalog feature that it introduces.
The existing packages are working correctly but if i do any type of change like adding, removing, of a package. pnpm updates other versions with it. i would expect it to only change the package i have mentioned.
Is there any flag i have overlooked that would allow for such an install.
This issue also happens when i do an update from master since master is on pnpm 8, pnpm 9 merges the lock file correctly picking the correct versions and writing them in the new format but in the process it updates the dependencies of other packages.

I am not sure how i can create a reproduction of this.
Any suggestions or guidance on this is much appreciated.

Thanks