ERROR: Uploading artifacts as 'archive' to coordinator

We are getting an error when running a pipeline. See below:

Uploading artifacts...
public/dist: found 38 matching artifact files and directories 
untracked: found 36 files                          
ERROR: Uploading artifacts as "archive" to coordinator... error  error=couldn't execute POST against https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes: Post "https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes": x509: certificate signed by unknown authority id=6059 token=BDqtpUa7
WARNING: Retrying...                                context=artifacts-uploader error=invalid argument
ERROR: Uploading artifacts as "archive" to coordinator... error  error=couldn't execute POST against https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes: Post "https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes": x509: certificate signed by unknown authority id=6059 token=BDqtpUa7
WARNING: Retrying...                                context=artifacts-uploader error=invalid argument
ERROR: Uploading artifacts as "archive" to coordinator... error  error=couldn't execute POST against https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes: Post "https://internalgitlab.corp/api/v4/jobs/6059/artifacts?artifact_format=zip&artifact_type=archive&expire_in=90+minutes": x509: certificate signed by unknown authority id=6059 token=BDqtpUa7
FATAL: invalid argument                            
ERROR: Job failed: exit code 1

We have updated the certificates on the gitlab server and the server running the gitlab runner. Not sure where else to look.

Any help would be greatly appreciated.