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Zulip

Open-source team chat with unique topic-based threading

Alternative to: slack, microsoft teams, discord


About Versions (100)

12.1

2026-06-26

Zulip Server 12.1 introduces improved search functionality, new administrative tools for organization management, and various stability and performance enhancements.

12.0

2026-04-27

Zulip 12.0 introduces a redesigned mobile app experience, improved performance for large streams, and various usability enhancements.

12.0-beta2

2026-04-26

Zulip 12.0-beta2 introduces improved performance, new UI enhancements, and various bug fixes across the server and web application.

11.6

2026-03-31

Zulip Server 11.6 introduces support for the new 'Topics' UI, enhances search capabilities, and includes various performance improvements and bug fixes.

12.0-beta1

2026-03-12

Zulip Server 12.0 beta1 introduces a new navigation sidebar, enhances message linking, and updates several core dependencies.

11.5

2026-02-05

Zulip 11.5 introduces enhanced search functionality, improved UI components for message editing, and various performance optimizations across the server.

11.4

2025-10-23

Zulip 11.4 introduces a new layout for the message list, improved search functionality, and various performance optimizations.

11.3

2025-10-22

Zulip Server 11.3 introduces an improved user profile page and various performance and usability enhancements.

11.2

2025-09-16

Zulip Server 11.2 introduces a new 'All Messages' view for streams and enhances the user interface for stream management and profile settings.

11.1

2025-09-11

Zulip 11.1 introduces new organizational tools, including a refined user administration interface, improved search capabilities, and various performance optimizations.

11.0

2025-08-13

Zulip Server 11.0 introduces a revamped user profile experience, improved search functionality, and various performance and security enhancements.

11.0-beta2

2025-07-30

Zulip Server 11.0-beta2 introduces the new 'Organization' settings page and various bug fixes and performance improvements.

11.0-beta1

2025-07-17

Zulip Server 11.0 beta1 introduces various improvements, enhancements, and bug fixes across the server and client.

10.4

2025-07-02

Zulip 10.4 introduces the ability to rename organizations, enhanced search functionality, and various performance improvements.

10.3

2025-05-15

Zulip Server 10.3 introduces the ability to search for messages across all streams and updates various UI elements for improved user experience.

10.2

2025-04-16

Zulip 10.2 introduces a redesigned messages view, improved search capabilities, and various performance enhancements and bug fixes.

10.1

2025-03-29

Zulip 10.1 introduces a new layout for the message list, enhanced search capabilities, and various performance improvements.

10.0

2025-03-20

Zulip 10.0 introduces a new server architecture and significant internal refactoring to improve performance and maintainability.

10.0-beta2

2025-03-07

Zulip Server 10.0 beta 2 includes various bug fixes, performance improvements, and refinements to the new user interface.

10.0-beta1

2025-03-01

Zulip 10.0.beta1 introduces several performance improvements, bug fixes, and updated dependencies for the server.

9.4

2025-01-16

Zulip 9.4 introduces support for external authentication via OIDC, improved search functionality, and various performance enhancements.

9.3

2024-11-23

Zulip 9.3 introduces a new stream-based message organization system, improved search functionality, and various performance optimizations.

9.2

2024-09-12

Zulip 9.2 introduces improved search functionality, new UI enhancements for organization management, and various bug fixes.

9.1

2024-08-02

Zulip 9.1 introduces improved message threading, enhanced search capabilities, and various performance optimizations for the server and client.

8.5

2024-08-01

Zulip 8.5 introduces several new features and performance improvements, including a new 'Recent' tab for conversations and enhanced search capabilities.

9.0

2024-07-25

Zulip 9.0 introduces a new user interface layout, enhanced search capabilities, and various performance optimizations.

9.0-beta1

2024-07-18

Zulip 9.0 Beta 1 introduces a redesigned user interface, improved performance, and new moderation tools.

8.4

2024-05-09

Zulip 8.4 introduces several performance improvements and new features for enhancing server administration and user collaboration.

8.3

2024-03-19

Zulip 8.3 introduces several improvements to the user interface and server-side performance, along with various bug fixes.

8.2

2024-02-16

Zulip 8.2 introduces the new 'Topics' experience for streamlined conversation management, alongside various performance improvements and bug fixes.

8.1

2024-01-25

Zulip 8.1 introduces improved search performance, a new 'pinned' messages feature for streams, and various UI refinements to enhance the user experience.

8.0

2023-12-15

Zulip 8.0 introduces a redesigned server architecture, enhanced search capabilities, and various performance improvements to the user interface.

8.0-beta2

2023-12-12

Zulip 8.0-beta2 introduces support for the new Zulip API, updates the user interface for better navigation, and includes various bug fixes and performance improvements.

8.0-beta1

2023-11-17

Zulip 8.0 beta 1 introduces several performance improvements, UI refinements, and bug fixes for the server and web app.

7.5

2023-11-16

Zulip 7.5 introduces a new simplified layout for the message composer and improves the performance of the search interface.

7.4

2023-09-16

Zulip 7.4 introduces a new 'pinned messages' feature for streams and topics, along with various performance improvements and bug fixes.

7.3

2023-08-25

Zulip 7.3 introduces a new UI for organization settings, improves message editing and deletion, and enhances the overall user experience with various stability and performance updates.

7.2

2023-07-05

This release improves reverse proxy logging and documentation, fixes various bugs including a PostgreSQL crash with PGroonga, and adds IPv6 nameserver support for nginx.

7.1

2023-06-13

This release introduces CPU and OS architecture checks, improves PostgreSQL upgrade error handling, and fixes several bugs related to scheduled messages, UI input, and image access.

7.0

2023-05-31

Version 7.0 introduces a significant visual redesign, new compose box features, JWT authentication, and updated permissions models, while renaming Private messages to Direct messages.

7.0-beta3

2023-05-29

This release introduces a major visual redesign, new compose box features, JWT authentication, and support for Debian 12 and Postgres 15.

6.2

2023-05-19

This release fixes several security vulnerabilities (CVE-2023-28623, CVE-2023-32677), resolves various UI and notification bugs, and introduces new configuration settings for RabbitMQ and time synchronization.

7.0-beta2

2023-05-11

This major release introduces a visual redesign, scheduled messages, JWT authentication, and updated permission models, while upgrading to Django 4.2 and adding Postgres 15 support.

7.0-beta1

2023-05-03

Zulip 7.0-beta1 introduces a major visual redesign, new compose box features, JWT authentication support, and updated permissions models for topics and privacy settings.

6.1

2023-01-23

This release includes numerous bug fixes for the web app and desktop client, documentation updates, and improvements to the installation and import processes.

6.0

2022-11-17

Version 6.0 introduces mark-as-unread, read receipts, a redesigned sidebar, and improved user profiles, while removing support for Debian 10 and PostgreSQL 10.

5.7

2022-11-16

This release fixes a SCIM bearer token security vulnerability, resolves LDAP user deactivation errors, and addresses several browser reloading and live-update bugs.

6.0-rc1

2022-11-03

Release of Zulip Server 6.0-rc1, a release candidate for the version 6.0 milestone.

6.0-beta1

2022-10-13

Zulip Server 6.0-beta1 introduces initial beta features and stability improvements for the upcoming 6.0 release.

5.6

2022-08-24

This release addresses security vulnerabilities CVE-2022-36048 and CVE-2022-35962, hardens authentication checks, and updates documentation and dependencies.

5.5

2022-07-22

Fixed a security vulnerability regarding bot role authorization, improved the restore-backup tool, and updated translations.

5.4

2022-07-12

This release addresses a security vulnerability regarding private file uploads, updates Python requirements, improves documentation, and resolves licensing issues by replacing GPL-licensed modules.

5.3

2022-06-21

This release fixes a security vulnerability regarding message edit exposure, upgrades Tornado to version 6, and optimizes the server upgrade process.

5.2

2022-05-04

This release includes various bug fixes for the UI, URL previews, PostgreSQL WAL logs, SCIM integration, and digest emails, alongside internal code refactoring and documentation updates.

5.1

2022-04-02

This release includes various bug fixes for upgrades, Slack imports, LXC installations, and UI improvements, alongside updated translations.

5.0

2022-03-29

Zulip 5.0 introduces topic resolution, web-public streams, status emojis, a redesigned compose box, ARM platform support, and expanded SSO and SCIM integrations.

5.0-rc2

2022-03-25

5.0-rc1

2022-03-16

Release candidate for Zulip Server 5.0, introducing new features and improvements.

4.11

2022-03-15

Fixed a race condition that could allow deactivated users continued access and updated translations.

4.10

2022-02-25

This release addresses multiple security vulnerabilities (CVE-2022-21706, CVE-2021-3967), fixes bugs in the reindex tool and ARM64 support, and pins PostgreSQL versions to prevent query regressions.

4.9

2022-01-25

This release addresses a critical RabbitMQ vulnerability, fixes various bugs related to Camo image proxy and database corruption, and updates system configuration requirements.

4.8

2021-12-01

This release addresses security vulnerabilities, enhances SSRF protection via Smokescreen and go-camo, improves the Slack importer, and includes various bug fixes and dependency updates.

4.7

2021-10-04

Fixed a regular expression denial-of-service vulnerability in linkifier patterns that could be exploited by organization administrators.

4.6

2021-09-23

Version 4.6 adds support for Debian 11, introduces LDAP synchronization for specific flags, updates the distribution server, and includes various bug fixes for installation and functionality.

2.1.8

2021-08-12

Fixed a potential database migration failure in 0257_fix_has_link_attribute.py to prevent errors during the upgrade process.

4.5

2021-07-25

Added a tool to fix database corruption caused by host OS upgrades.

4.4

2021-07-22

This release includes a database corruption fix tool, security patches for Markdown parsing and Smokescreen, S3 performance improvements, and several bug fixes and management command additions.

4.3

2021-06-02

This release includes various bug fixes for Jitsi, GIPHY, and Dropbox integrations, as well as improvements to Grafana formatting and storage backend support.

4.2

2021-05-14

Fixes issues with purge-old-deployments during Git upgrades and installation from root-only directories.

4.1

2021-05-14

Fixed an exception encountered when upgrading from older releases to the 4.x series.

4.0

2021-05-13

Version 4.0 introduces a Moderator role, native Giphy integration, improved code blocks, and a redesigned 'Recent topics' view, alongside significant API updates and security enhancements.

4.0-rc1

2021-05-04

This is the first release candidate for Zulip Server 4.0.

3.4

2021-04-14

This release addresses several security vulnerabilities (CVEs), fixes HTML injection and email configuration bugs, and adds support for modern desktop application logout events.

3.3

2020-12-01

This update fixes stream posting permissions, resolves outgoing mail issues, improves the PostgreSQL upgrade tool, and renames the user role management command.

3.2

2020-09-15

Updates include switching to python-binary-memcached, removing a problematic dependency, improving email security and validation, and fixing various search and configuration bugs.

3.1

2020-07-30

This release removes the unused short_name field from the User model, adds Thinkst Canary integration, and includes various bug fixes across the platform.

3.0

2020-07-16

Version 3.0 introduces support for Ubuntu 20.04, moving topics between streams, new authentication options, and a redesigned UI, while dropping support for Ubuntu 16.04 and Debian 9.

3.0-rc1

2020-07-02

2.1.7

2020-06-26

Fixes a privilege escalation vulnerability and updates the default memcached authentication username.

2.1.6

2020-06-17

Fixed a Python 3.6+ syntax issue that prevented installation on Ubuntu Xenial.

2.1.5

2020-06-17

This release addresses multiple security vulnerabilities including XSS and tabnapping, fixes database migration bugs, and improves Slack import stability.

2.1.4

2020-04-16

This release fixes data import regressions, removes an obsolete Postgres extension, improves the Git upgrade process, and deprecates support for Ubuntu 16.04 and Debian 9.

2.1.3

2020-04-01

This release addresses several security vulnerabilities, improves server initialization for Docker, and includes numerous bug fixes across authentication, email integration, and the user interface.

2.1.2

2020-01-16

This release includes security fixes for CVE-2019-19775, improved LDAP and cache authentication, and various bug fixes for the UI and installer.

2.1.1

2019-12-14

Fixed LDAP integration upgrade issues, reimplemented a Postgres installer option for DBaaS support, and improved documentation.

2.1.0

2019-12-13

This release adds SAML authentication, Mattermost import, and Debian buster support, while improving the email gateway and redesigning email notifications.

2.0.8

2019-12-13

Fixed a security vulnerability (CVE-2019-19775) relating to an open redirect in the thumbnail view.

2.1.0-rc1

2019-11-22

This is a release candidate for Zulip server version 2.1.0.

2.0.7

2019-11-21

Fixed an insecure account creation vulnerability via social authentication and added backend enforcement for zxcvbn password strength checks.

2.0.6

2019-09-23

Updates signing keys for Debian Stretch and fixes bugs related to URL linkifiers and message list scrolling.

2.0.5

2019-09-23

This release addresses two security vulnerabilities (CVE-2019-16215, CVE-2019-16216) and fixes issues with Ubuntu Bionic configuration, Slack imports, and the knight command.

2.0.4

2019-06-07

This release fixes several bugs related to backup restoration, table layouts, administrator editing of bot users, PGRoonga search backend, and personal API key retrieval.

2.0.3

2019-04-23

This release includes documentation for OS upgrades, configurable uwsgi buffer size, and various bug fixes for LaTeX syntax, virtualenv, LDAP tests, backup tools, and YouTube previews.

2.0.2

2019-03-15

This release includes various bug fixes for S3 uploads, LDAP synchronization, UI elements, and updated translations.

2.0.1

2019-03-05

This release includes several bug fixes for file routing, branding logos, and deployment directories, along with support for multiple organizations using the same LDAP backend.

2.0.0

2019-03-05

This release introduces LDAP synchronization, a /poll command, Zoom integration, and stabilizes guest users and data import tools, while deprecating Ubuntu Trusty support.

2.0.0-rc1

2019-02-14

1.9.1

2018-11-30

This release improves the installation experience with multi-domain certificate support and better documentation, while fixing bugs in Slack imports and mobile API authentication.

1.9.0

2018-11-07

Version 1.9.0 introduces support for Ubuntu Bionic and Debian Stretch, new data import tools, custom user profile fields, Google Hangouts integration, and significant performance improvements.

1.9.0-rc2

2018-08-31