clojurescript - devtools.core not found after including cljs-ajax

Question

I've set up a new Reagent project with lein new reagent-frontend serverless-todo-front-cljs

After I include cljs-ajax and run lein figwheel I get an error:

No such namespace: devtools.core, could not locate devtools/core.cljs, devtools/core.cljc, or JavaScript source providing "devtools.core"

The install is fresh the only change I have made is to include cljs-ajax in project.clj, like this:

:dependencies [[org.clojure/clojure "1.9.0"]
             [org.clojure/clojurescript "1.10.238"]
             [reagent "0.8.0"]
             [cljs-ajax "0.7.3"]]

Any tips on how to solve or how to even attempt to debug this are highly appreciated. I have already tried deleting the entire project and creating a new one with a different name.