Fix error sam deploy unable to locate credentials using AWS SAM with AWS CLI v2 SSO

I got this error sam deploy unable to locate credentials when trying to use AWS SAM with AWS CLIv2 SSO.

Error: Unable to upload artifact myAPIName referenced by CodeUri parameter of myAPIName resource.
Unable to locate credentials

In summary, the fix is to update SAM.

The issue: sam deploy unable to locate credentials

First, I signed into AWS SSO with the profile I wanted to use.

$ aws sso login --profile new-dev-sso

Then, I tried to run sam deploy. This failed with the following error:

Error: Unable to upload artifact myAPIName referenced by CodeUri parameter of myAPIName resource.
Unable to locate credentials

This GitHub issue shows that this may be a glitch with AWS SSO fixed in a newer SAM version.

Check your SAM version against the current version found here under releases.

$ sam --version
SAM CLI, version 0.53.0

The current version is over 1.0.0 at the time of writing, so I am way out of date.

The Fix

Update SAM CLI and check the new version

Linux:

$ pip3 install --user --upgrade aws-sam-cli
Successfully installed aws-lambda-builders-1.1.0 aws-sam-cli-1.4.0 aws-sam-translator-1.27.0 boto3-1.14.63 botocore-1.17.63

$ sam --version
SAM CLI, version 1.4.0

Windows:

If you run SAM on windows, please leave a comment with the update process for you so I can post it here.