PhotoSwipe cannot be found in remote repositories by Composer

[cosmin-hodis]

The Drupal PhotoSwipe module () requires the PhotoSwipe library installed - usually by using Composer, like composer require bower-asset/photoswipe:^5.

My last attempt at updating a site via Composer gave me an error:
Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires bower-asset/photoswipe ^5, found bower-asset/photoswipe[v5.4.4] in the lock file but not in remote repositories, make sure you avoid updating this package to keep the one from the lock file. Problem 2 - Root composer.json requires npm-asset/photoswipe-dynamic-caption-plugin ^1, found npm-asset/photoswipe-dynamic-caption-plugin[1.2.7] in the lock file but not in remote repositories, make sure you avoid updating this package to keep the one from the lock file.

It seems that, for some reason, PhotoSwipe cannot be found in any repositories.