title: synchronysing dependencies between system and application
body: <p>The following error</p>
  <pre><code>You have already activated strscan 3.0.1, but your Gemfile requires strscan 3.0.3.  
  Since strscan is a default gem, you can either remove your dependency on it or try updating to a newer version of bundler that supports strscan as a default gem. (Gem::LoadError)
  </code></pre>
  <p>where <code>bundle -v   Bundler version 2.3.13</code></p>
  <p>regards a dependency which is not directly invoked in the Gemfile.  The Gemfile.lock does state <code>strscan (3.0.3)</code>  strscan is invoked by <code>net-imap (0.2.3)</code></p>
  <pre><code>gem update --system
  gem update bundler
  touch tmp/restart.txt
  </code></pre>
  <p>does not solve the issue.</p>
  <p>How can this versioning matter be ironed out? Be it via explicit verisoning or removal of dependency</p>