Compilation warning about dependency that is already specified

Hi! I have an app that use a pagination library called scrivener_html. With Elixir 1.11 it trigger a bunch of compilation warnings like this:

warning: Phoenix.Naming.resource_name/1 defined in application :phoenix is used by the current application but the current application does not directly depend on :phoenix. To fix this, you must do one of:      
                                                                                                                                                                                                                   
  1. If :phoenix is part of Erlang/Elixir, you must include it under :extra_applications inside "def application" in your mix.exs                                                                                  
                                                                                                                                                                                                                   
  2. If :phoenix is a dependency, make sure it is listed under "def deps" in your mix.exs                                                                                                                          
                                                                                                                                                                                                                   
  3. In case you don't want to add a requirement to :phoenix, you may optionally skip this warning by adding [xref: [exclude: Phoenix.Naming]] to your "def project" in mix.exs                                    
                                                                                                                                                                                                                   
  lib/scrivener/html.ex:178: Scrivener.HTML.name_for/2                                                                                                                                                             
                                                                                                                                                                                                                   
warning: Phoenix.HTML.__using__/1 defined in application :phoenix_html is used by the current application but the current application does not directly depend on :phoenix_html. To fix this, you must do one of:  
                                                                                                                                                                                                                   
  1. If :phoenix_html is part of Erlang/Elixir, you must include it under :extra_applications inside "def application" in your mix.exs                                                                             
                                                                                                                                                                                                                   
  2. If :phoenix_html is a dependency, make sure it is listed under "def deps" in your mix.exs                                                                                                                     
                                                                                                                                                                                                                   
  3. In case you don't want to add a requirement to :phoenix_html, you may optionally skip this warning by adding [xref: [exclude: Phoenix.HTML]] to your "def project" in mix.exs                                 
                                                                                                                                                                                                                   
Found at 2 locations:                                                                                                                                                                                              
  lib/scrivener/html.ex:2: Scrivener.HTML                                                                                                                                                                          
  lib/scrivener/html/seo.ex:15: Scrivener.HTML.SEO             
[...]

Since that library isn’t maintained anymore, I have a fork of it and I thought I’d just follow instructions from the warnings and add phoenix and phoenix_html in deps but actually there are already there: https://github.com/weatherforce/scrivener_html/blob/master/mix.exs#L47
So I don’t understand why I’m getting this warning.