Artifacts are getting reverted to 100 MB after changing


We have our own gitlab installation on AWS. The situation here is we are getting below error:
Uploading artifacts to coordinator… too large archive id=17974 responseStatus=413 Request Entity Too Large status=413 Request Entity Too Large token=AzcDxGG3

Now we have changed the artifacts from 100 MB to 400 MB which resolved the problem but after sometime it is reverting back to 100 MB and causing the failure.

Can anyone help on this? How to fix this?