Heroku Redis - Redis::CannotConnectError: Error connecting to Redis on 127.0.0.1:6372 - certificate verify failed

When I make my first call to sidekiq on Heroku, the following error is thrown:

Redis::CannotConnectError: Error connecting to Redis on 127.0.0.1:6372

Which of course is not the IP of my Heroku:Redis. That URL is defined in my ENV vars as:

rediss://:[email protected]:port

Interestingly in a Heroku console I do this:

redis = Redis.new

which correctly returns:

=> #<Redis client v4.2.5 for redis://blah-blah-blah.compute-1.amazonaws.com:port/0>

But then when I do:

redis.set("hey", "you")

I get:

OpenSSL::SSL::SSLError (SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate in certificate chain))

I have the following in my sidekiq.rb

require 'sidekiq'

Sidekiq.configure_client do |config|
  Sidekiq::Status.configure_client_middleware config, expiration: 30.minutes
  if Rails.env.production?
    url = URI.parse(ENV["REDIS_URL"])
    url.scheme = "rediss"
    url.port = Integer(url.port) + 1
    config.redis = {
      url: url.to_s,
      network_timeout: 5,
      ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE }
    }
  end
end

Sidekiq.configure_server do |config|
  Sidekiq::Status.configure_server_middleware config, expiration: 30.minutes
  Sidekiq::Status.configure_client_middleware config, expiration: 30.minutes
  if Rails.env.production?
    url = URI.parse(ENV["REDIS_URL"])
    url.scheme = "rediss"
    url.port = Integer(url.port) + 1
    config.redis = {
      url: url.to_s,
      network_timeout: 5,
      ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE }
    }
  end
end

Here is my redis.rb

require 'uri'
url = URI.parse(ENV["REDIS_URL"])
url.scheme = "rediss"
url.port = Integer(url.port) + 1
$redis = Redis.new(url: url, driver: :ruby, ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE })

Procfile

release: bin/rails db:migrate
web: bin/start-stunnel bin/rails server -p ${PORT:-5000} -e $RAILS_ENV
worker: bin/start-stunnel bundle exec sidekiq

and I'm running redis - 4.2.5 sidekiq - 6.2.0 ruby - 2.6.5