Boto version required by s3_attachments is incompatible with boto version required by frappe 15 dev

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ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
frappe 15.0.0.dev0 requires boto3~=1.18.49, but you have boto3 1.4.7 which is incompatible.
Installing erpnext_ocr
$ /home/user/frappe/env/bin/python -m pip install --quiet --upgrade -e /home/user/frappe/apps/erpnext_ocr
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
frappe-s3-attachment 0.0.1 requires boto3==1.4.7, but you have boto3 1.18.65 which is incompatible.
frappe-s3-attachment 0.0.1 requires botocore==1.7.48, but you have botocore 1.21.65 which is incompatible.