checkmanifest check is failing

tox -e checkmanifest
checkmanifest installed: build==0.7.0,check-manifest==0.47,packaging==21.3,pep517==0.12.0,pyparsing==3.0.7,toml==0.10.2,tomli==2.0.1
checkmanifest run-test-pre: PYTHONHASHSEED='1414042973'
checkmanifest run-test: commands[0] | check-manifest
lists of files in version control and sdist do not match!
missing from sdist:
  LICENSES/BSD-3-Clause.txt
  LICENSES/CC0-1.0.txt
suggested MANIFEST.in rules:
  recursive-include LICENSES *.txt
ERROR: InvocationError for command /home/gk/nethealth/onbasca/.tox/checkmanifest/bin/check-manifest (exited with code 1)
______________________________________________________________________________ summary _______________________________________________________________________________
ERROR:   checkmanifest: commands failed

That's on main + !26 (merged). Do we need to update our CI to catch those things?