Try this
Step 1 : goto frappe-bench/apps/ and Remove erpnext ---->$ rm -r erpnext
Step 2 :Goto frappe-bench/------> $ bench get-app erpnext GitHub - frappe/erpnext: Free and Open Source Enterprise Resource Planning (ERP) --branch master
Step 3 : bench update.
you’ll have frappe as well as erpnext in master branch
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