The isort bug is now fixed so there's no need to skip the deprecated.py module anymore.

tox.ini

@@ -88,4 +88,4 @@ commands =
     pydocstyle {toxinidir}/celery
 
 [testenv:isort-check]
-commands = isort -j2 --skip celery/utils/deprecated.py --project celery --diff --order-by-type -rc -c {toxinidir}/celery {toxinidir}/t
+commands = isort -j2 --project celery --diff --order-by-type -rc -c {toxinidir}/celery {toxinidir}/t