Release & Version Identifier

Jina is shipped from two package management systems, PyPi and Docker Hub. This article clarifies the release cycle and version identifier behind each system.

PyPi package versioning

We follow PEP-440, and a form of semantic versioning as explained above.

To install the latest final release:

pip install -U jina

To install a particular final release:

pip install jina==x.y.z

The term “final release” is relative to “developmental release” as described below.

Developmental releases versioning

One every master-merging event, we create early releases directly from source control which do not conflict with later project releases. The version identifier for development release is x.y.z.devN, which adds a suffix .dev, followed by a non-negative integer value N, which is reset on every release.

To install the latest development release:

pip install --pre jina

Version epochs

Release cycle and versioning

Jina is developed continuously by the community and core team. Updates are grouped and released at regular intervals to align with software development best practices.

Jina follows a form of numbered versioning. The version number of the product is a three-part value x.y.z where x, y, and z are the major, minor, and patch components respectively.

  • Patch release (x.y.z -> x.y.(z+1)): Contain bug fixes, new features and breaking changes. Released weekly on a Wednesday morning CET.

  • Minor release (x.y.z -> x.(y+1).0): Contain bug fixes, new features and breaking changes. Released monthly on the first Wednesday of the month CET. This release is more QA tested and considered more stable than a patch release.

  • Major release (x.y.z -> (x+1).0.0): Are released based on the development cycle of the Jina company. There is no set scheduled for when these will occur.

The following example shows how Jina is released from 0.9 to 0.9.2 according to the schema we defined above.

Event e After e, pip install jina After e, pip install --pre jina After e, master
Release 0.9.0 0.9.0 0.9.1.dev0
Master merging 0.9.0 0.9.1.dev0 0.9.1.dev1
Master merging 0.9.0 0.9.1.dev1 0.9.1.dev2
Master merging 0.9.0 0.9.1.dev2 0.9.1.dev3
Release 0.9.1 0.9.1 0.9.2.dev0
Master merging 0.9.1 0.9.2.dev0 0.9.2.dev1

Docker image versioning

Our univeral Docker image is ready-to-use on linux/amd64, linux/armv7+, linux/arm/v6. The Docker image name always starts with jinaai/jina followed by a tag composed of three parts:

  • {version}: The version of Jina. Possible values:

    • latest: the last release;

    • master: the master branch of jina-ai/jina repository;

    • x.y.z: the release of a particular version;

    • x.y: the alias to the last x.y.z patch release, i.e. x.y = x.y.max(z);

  • {python_version}: The Python version of the image. Possible values:

    • , -py37: Python 3.7;

    • -py38 for Python 3.8;

    • -py39 for Python 3.9;

  • {extra}: the extra dependency installed along with Jina. Possible values:

    • : Jina is installed inside the image via pip install jina;

    • -devel: Jina is installed inside the image via pip install jina[devel];

    • -daemon: Jina is installed inside the image via pip install jina[dameon] along with fluentd; and the entrypoint is set to jinad.


  • jinaai/jina:0.9.6: the 0.9.6 release with Python 3.7 and the entrypoint of jina.

  • jinaai/jina:latest-py38-daemon: the latest release with Python 3.8 base and the entrypoint of Jina daemon.

  • jinaai/jina:latest: the latest release with Python 3.7 and the entrypoint of jina

  • jinaai/jina:master: the master with Python 3.7 and the entrypoint of jina

Do I need -devel?

Use -devel image, if you want to:

  • have efficiency improvement on AsyncIO and data compression

  • enable prettified error printing

  • build Jina Hub extension

  • expose REST interface beyond gRPC

  • enable log-streaming/aggregating via fluentd

  • enable mime-type sniffing

Image alias and updates

Event Updated images Aliases
On Master Merge jinaai/jina:master{python_version}{extra}
On x.y.z release jinaai/jina:x.y.z{python_version}{extra} jinaai/jina:latest{python_version}{extra}, jinaai/jina:x.y{python_version}{extra}

Six images are built, i.e. taking the combination of:

  • {python_version} = ["-py37", "-py38"]

  • {extra} = ["", "-devel", "-daemon"]

Image size on different tags

Image Size

Manual Release Entrypoint

Manual release entrypoint is designed for authroized core developers of Jina.

Trigger weekly release manually

One can release a hotfix immediately without waiting for the weekly release. Here are the steps:

  1. Go to here

  2. Click on “Run Workflow” dropdown button on the right and input the release token and the release reason.

  3. Click on “Run Workflow” green button.

Rebuild all Docker images for certain git tag manually

  1. Go to here

  2. Click on “Run Workflow” dropdown button on the right and input the release token and the release reason.

  3. Click on “Run Workflow” green button.

Rebuild all Docker images

Note, the manual rebuild on Docker images will NOT update :latest-* and :x.y-* aliases.

Breaking changes

Definition of breaking changes

Breaking changes are non-backward compatible changes to the contracts of methods we expose to our users through our public API interfaces.

We define our public API are being the public functions and Classes in the following modules:

  • YAML Syntax interface

  • Python interface

    • jina/flow

    • jina/peapods/pods

    • jina/executors

    • jina/drivers

    • jina/types (doc/doc sets)

    • jina/resources

    • jina/clients

    • jina/optimizers


  • Command line Interface API

  • Jina Deamon (JinaD) API

  • Jina.proto

  • Jina Hub API

Examples of breaking changes are:

  • Changing the name of a field.

  • Deleting a field

  • Changing the shape or type of a response

  • Changing the method used to get a response (Example: GET to POST).

  • Adding new required parameters to a response.

Examples of non-breaking changes are:

  • Deleting/changing the arguments in a public function/class with a deprecation warning.

  • Deleting unused fields from jina.proto

  • Adding fields to jina.proto with unused positions

  • Experimental APIs claimed in the previous release notes

  • Fixing bugs if the implementation is clearly broken, if it contradicts documentation or if a well-known and well-defined intended behavior is not properly implemented.

  • Deleting unused APIs for which we find no documented uses. We use the following tools to perform checks,






  • Replacing error behaviors with non-error behaviors. Changes to low-level APIs such as drivers are not considered breaking changes.

Documenting a breaking change

  1. Breaking changes should be highlighted in the pull request checklist.

  2. At the start of a month, a GitHub breaking change issue is opened. If a developer’s pull request contains breaking changes, it is their reasonability to record it there. This is the inital source of truth for recent breaking changes.

  3. The contents of this GitHub issue are then merged into the release notes.