title: In Xcode macOS deployment target is 10.15 but on launch, app requires macOS 11.3
body: <p><em>Xcode 12.5.1 · macOS 12.0 Beta 6</em></p>
  <p>I have been upgrading a macOS app written by someone else, which has <strong>always worked correctly on macOS 10.15 Catalina</strong>.</p>
  <p>Having finished the upgrades, I find that <strong>it no longer launches on Catalina</strong>:</p>
  <p><a href="https://i.stack.imgur.com/STb5A.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/STb5A.png" alt="enter image description here" /></a></p>
  <p>However, I have not changed the macOS Deployment Target, which is still 10.15:</p>
  <p><a href="https://i.stack.imgur.com/aUQiT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aUQiT.png" alt="enter image description here" /></a></p>
  <p>I don't know what would cause the requirement for macOS 11.3 — <strong>every modification to the program was done using capabilities that were present in the previous version</strong>.</p>
  <p><strong>I did not modify any build parameters</strong> — I only changed the code.</p>
  <p><strong>I have updated Xcode since the previous release.</strong></p>
  <p>I have done quite a lot of Googling, but I have not been able to find anything. The relevant search terms all turn up results about Xcode versions.</p>
  <p>Any pointers in looking for an answer, or even just a direction to investigate, would be very helpful.</p>