Deactivate a pipenv environment

How can I deactivate my pipenv environment?

With other tools I've been able to do something like source deactivate, but that has no affect here.

Create an environment:

pipenv --three

Activate the environment:

source $(pipenv --venv)/bin/activate

But how to deactivate?

To elaborate on Williams' answer a bit more, the expected workflow is to enter the virtualenv using pipenv shell. When you activate the virtualenv that way, the console output now indicates to use exit:

Spawning environment shell (/bin/zsh). Use 'exit' to leave.

Trying to exit the virtualenv with deactivate will leave pipenv in a confused state because you will still be in that spawned shell instance but not in an activated virtualenv.

Using the shell command exit also works.

This worked for me when using deactivate still left me with the error:

Shell for UNKNOWN_VIRTUAL_ENVIRONMENT already activated.
No action taken to avoid nested environments.

After using exit I could successfully switch pipenv instances. This could well be a bug and I should probably report it.