I seem to have both these, for starters (both are here because I was, I’m sure, flailing in the past and copy-pasta’ing duplicate variations into my init.el):

(add-to-list 'package-archives '("tromey" . "") t)

(add-to-list 'package-archives '("melpa" . "") t)

(add-to-list 'package-archives '("melpa-stable" . "") t)

(add-to-list 'package-archives '("melpa" . "") t)

(add-to-list 'package-archives '("melpa" . ""))

(add-to-list 'package-pinned-packages '(cider . "melpa-stable") t)

I'm not sure how to fix this directly but straight.el lets you install from github which is really nice

combined with use-package you can get the latest of everything with some nice syntax for hooks and stuff

Thanks! I’ll try to figure that out.