Compat problem with rails 4.2.11 & devise 4.6.2

[joshco]

I'm trying to use the 2.x version of invitable. The readme says it should work including devise 4.6.
I'm getting this error about a conflict with actionmailer, where invitable depends on actionmailer 5.x.. bundle update fails worse.

Is the 2.x version not compatible with Rails 4.x?

Bundler could not find compatible versions for gem "actionmailer":
  In snapshot (Gemfile.lock):
    actionmailer (= 4.2.11.1)

  In Gemfile:
    devise_invitable (~> 2.0.0) was resolved to 2.0.1, which depends on
      actionmailer (>= 5.0)

    rails (= 4.2.11.1) was resolved to 4.2.11.1, which depends on
      actionmailer (= 4.2.11.1)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.
ubuntu@wsl:~/unx/talker$ bundle list devise
/home/ubuntu/.rvm/gems/ruby-2.5.1/gems/devise-4.6.2

[scambra]

Devise Invitable 2.x is not compatible with rails 4.2, support was dropped in this PR:
#785