Won't install `npm:@supabase/ssr`

I'm trying to build something with Fresh and Supabase and would like to use the @supabase/ssr@supabase/ssr package (which is still in beta). Deno won't load the package though, what am I doing wrong?

npm

This submodule provides convenience helpers for implementing user authentication in your favorite framework.. Latest version: 0.0.10, last published: 2 months ago. Start using @supabase/ssr in your project by running npm i @supabase/ssrnpm i @supabase/ssr. There are 3 other projects in the npm registry using @supabase/ssr.