Switch to v7.0.x error

I am switching to v7 with bench switch-to-branch v7.0.x
after that when i run bench update then it show the following error.
/frappe-bench/env/bin/python: No module named sanitizer

Please help me asap!

try pip install bleach==1.4.3

Hi @johnskywalker
I face the same problem as i need to get v7 for some old work, and i try your suggestion but the same error.
any updates for that error?