Upgrade python packages from requirements.txt using pip command

How do I upgrade all my python packages from requirements.txt file using pip command?

tried with below command

$ pip install --upgrade -r requirements.txt

Since, the python packages are suffixed with the version number (Django==1.5.1) they don’t seem to upgrade. Is there any better approach than manually editing requirements.txt file?

EDIT

As Andy mentioned in his answer packages are pinned to a specific version, hence it is not possible to upgrade packages through pip command.

But, we can achieve this with pip-tools using the following command.

$ pip-review --auto

this will automatically upgrade all packages from requirements.txt (make sure to install pip-tools using pip install command).

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