How to upgrade bench?
Inside the frappe-bench directory run this
pip3 install --upgrade frappe-bench
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If you use frappe into docker for developpement, the base repo branch for bench is develop, still in 5.2.1. A PR is going to fix that (https://github.com/frappe/bench/pull/1129).
As this part of the docker image is not consistant, so you have to do pip3 install --upgrade frappe-bench each time your stop/start the docker container
EDIT: a better PR ( chore: update version by hasnain2808 · Pull Request #1138 · frappe/bench · GitHub) was merge, now it’s ok 
Thank ERPNext Team !
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After upgrade ，bench version still shows 5.0.0 ！
try using sudo
pip3 install --upgrade frappe-bench / sudo pip3 install --upgrade frappe-bench
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Don’t forget to close the terminal and reopen it in order to see change!
INFO: A newer version of bench is available:
pip3 install --upgrade frappe-bench
error: externally-managed-environment
× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
python3-xyz, where xyz is the package you are trying to
install.
If you wish to install a non-Debian-packaged Python package,
create a virtual environment using python3 -m venv path/to/venv.
Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
sure you have python3-full installed.
If you wish to install a non-Debian packaged Python application,
it may be easiest to use pipx install xyz, which will manage a
virtual environment for you. Make sure you have pipx installed.
See /usr/share/doc/python3.12/README.venv for more information.
note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.