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I'm using pip with a requirements file, in a virtualenv, for my Django projects. I'm trying to upgrade some packages, notably Django itself, and I'm getting an error about source code conflicts:

Source in <virtualenv>/build/Django has version 1.2.3 that conflicts with Django==1.2.4 (from -r requirements/apps.txt (line 3))

That's after updating the version number of Django from 1.2.3 to 1.2.4 in my requirements file. I'm using this command to actually do the upgrade:

pip --install --upgrade -E `<virtualenv dir`> --requirement `<requirements file`>

I can't find any flag that triggers a total package re-download. I even tried running an uninstall command first, and then the install, but no dice. Am I missing something?

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  • 2
    Please check @dr-jimbob 's answer because recent versions of pip will actually upgrade all other dependencies that the package you are upgrading depends on. Commented Jan 31, 2018 at 9:00
  • @gcaprio I'd rather advice you to choose marcin swierczynski answer now Commented Jul 8, 2021 at 12:29
  • In an app that has a Django backend and Angular frontend, should the requirements.txt file be in the root directory (and run there with py -m pip install -r requirements.txt) or should it be in the backend folder where files such as manage.py are located? Commented Dec 11, 2021 at 11:34
  • Every so often you get a message from pip itself, asking you to upgrade it and it gives you the command to do so. So just use the same command but for another package. Commented Feb 5, 2023 at 1:42

11 Answers 11

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1717

I ran the following command and it upgraded from 1.2.3 to 1.4.0

pip install Django --upgrade

Shortcut for upgrade:

pip install Django -U

Note: if the package you are upgrading has any requirements this command will additionally upgrade all the requirements to the latest versions available. In recent versions of pip, you can prevent this behavior by specifying --upgrade-strategy only-if-needed. With that flag, dependencies will not be upgraded unless the installed versions of the dependent packages no longer satisfy the requirements of the upgraded package.

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8 Comments

This for me updated all my packaged and totally messed up everything!!!! Documents states: --upgrade all packages to the newest available version. Is this correct or did I do something wrong?
@OrbiterFleet I needed to update "requests" so I did pip install Requests --upgrade and only "requests" was upgraded. The description says "upgrade all specified packages" when I view the docs.
ATTENTION, it also updates all dependencies and can mess up with everything. the best option is to uninstall and reinstall the package.
to upgrade specific package use pip install --upgrade django==1.4.0
this should be the right answer according to question or the question itself is wrong.
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85

According to pip documentation example 3:

pip install --upgrade django

But based on my experience, using this method will also upgrade any package related to it. Example:

Assume you want to upgrade somepackage that require Django >= 1.2.4 using this kind of method it will also upgrade somepackage and django to the newest update. Just to be safe, do:

# Assume you want to keep Django 1.2.4
pip install --upgrade somepackage django==1.2.4

Doing this will upgrade somepackage and keeping Django to the 1.2.4 version.

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2 Comments

Good catch but your explanation is confusing since you started with django as a main package then in the example you use somepackage and then use django as a dependency.
Yes it should be pip install --upgrade django==1.2.4 without the "somepackage"
83

First make sure you have checked the most voted answer.

I'm not sure if it's exactly your problem, but in my case, I wasn't able to upgrade Django to 1.2.4 - I was always finishing with 1.2.3 version, so I uninstalled Django with:

<virtualenv>/bin/pip uninstall Django

Then I removed <virtualenv>/build/Django directory and finally I installed the proper version with:

<virtualenv>/bin/pip install Django
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2 Comments

This is not the best practice. Use pip install Django -U or pip install Django --upgrade as described in @JoeyG 's answer.
@Ahmad agree. There should be a smooth update process in pip and virtual env.
42

The shortcut command for --upgrade:

pip install Django --upgrade

Is:

pip install Django -U
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3 Comments

How about editing the existing answer to add this bit of information instead of an (incomplete) answer?
@a1an please suggest what extra info that you think should be added in a "suggested edit". Thanks
I mean you could edit the answer given by JoeyG, adding the shortcut option you provided in context there.
30

If you only want to upgrade one specific package called somepackage, the command you should use in recent versions of pip is

pip install --upgrade --upgrade-strategy only-if-needed somepackage

This is very useful when you develop an application in Django that currently will only work with a specific version of Django (say Django=1.9.x) and want to upgrade some dependent package with a bug-fix/new feature and the upgraded package depends on Django (but it works with, say, any version of Django after 1.5).

The default behavior of pip install --upgrade django-some-package would be to upgrade Django to the latest version available which could otherwise break your application, though with the --upgrade-strategy only-if-needed dependent packages will now only be upgraded as necessary.

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1 Comment

--upgrade-strategy only-if-needed seems to be the default now, see documentation
18

If you upgrade a package, the old one will be uninstalled.

A convenient way to do this is to use this pip-upgrader which also updates the versions in your requirements.txt file for the chosen packages (or all packages).

Installation

pip install pip-upgrader

Usage

Activate your virtualenv (important, because it will also install the new versions of upgraded packages in current virtualenv).

cd into your project directory, and then run:

pip-upgrade

Advanced usage

If the requirements are placed in a non-standard location, send them as arguments:

pip-upgrade path/to/requirements.txt

If you already know what package you want to upgrade, simply send them as arguments:

pip-upgrade -p django -p celery -p dateutil

If you need to upgrade to pre-release / post-release version, add --prerelease argument to your command.

Full disclosure: I wrote this package.

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3 Comments

is there an option to upgrade all packages at once (ie, without listing them) with this approach?
@MikePalmice yes: pip-upgrade -p all will upgrade all your packages and update requirements file without needing any input from you.
Doesn't fork for me. Helped finally: pip install -r requirements.txt --upgrade
15

This solved the issue for me:

pip install -I --upgrade psutil --force

Afterwards just uninstall psutil with the new version and hop you can suddenly install the older version (:

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9

Defining a specific version to upgrade helped me instead of only the upgrade command.

pip3 install larapy-installer==0.4.01 -U
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1 Comment

this works for me Python 3.8.1
6

to upgrade your package

pip install --upgrade YOUR_PACKAGE_NAME==VERSION

from requirement file

pip install --upgrade -r requiremnet.txt
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4

Normally, pip will clean up after itself and remove the contents of the build directory. The only time it doesn't do this is if:

  1. You used the --no-install option
  2. You are using editable packages
  3. The installation was cancelled or was otherwise interrupted.

In all other cases, you shouldn't have build directory that's clogging your environment.

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0

I use this: 

pip3 install -r  requirements.txt
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