We will follow the [Astropy versioning scheme](). This means for Gammapy we will use a numbering scheme like:

` x.y.z`

Where, x = major, y = minor, z = bugfix.

Within each "category" the numbers are counted from 0. Check the following examples:

• 1.0.0 (LTS release)
• 1.0.1 (LTS bugfix release)
• 1.0.2 (2nd LTS bugfix release)
• 1.1.0 (feature release, six months after 1.0.0)
• 1.1.1 etc.
• 1.0.3 (3rd LTS bugfix release)
• 1.1.2
• 1.2.0 (six months after 1.1.0)
• 1.2.1
• 1.3.0 (six months after 1.2.0)
• 1.0.4
• 1.3.1
• 2.0.0 (LTS release)

As a rough guideline: - On the feature freeze date a new release branch is created, named e.g. v1.0.x. - A feature freeze will mean no more major new feature pull requests will be accepted for that version, but minor improvements, bug fixes, or documentation additions are still acceptable. - From this point on the release happens from this branch v1.0.x. - First create a release candidate i.e. tag v1.0rc1, collect feedback from beta testers and developers for ~1 week. - If additonal issue are found those should be fixed and a new release candidate v1.0rc2 is tagged. A new testing period starts - Tag v1.0 and release

If you would like to take the role of a release manager you need an account for [TestPyPi](https://test.pypi.org). If you don't have one, create one here: https://test.pypi.org/account/register/.

Follow [Astropy Affiliated Package release instructions](https://docs.astropy.org/en/latest/development/astropy-package-template.html)

Upload test release:

` twine upload --repository testpypi dist/*`

Install from TestPypi:

` python3 -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ gp-lts-workflow`

Install release candidate:

` python3 -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ gp-lts-workflow==1.0rc2`

• [Astropy affiliated package template](https://github.com/astropy/package-template)
• [Astropy APE 2](https://github.com/astropy/astropy-APEs/blob/main/APE2.rst#version-numbering)
• [Astropy affiliated package release instructions](https://docs.astropy.org/en/latest/development/astropy-package-template.html)
• [Astropy LTS release instructions](https://docs.astropy.org/en/latest/development/releasing.html)