Zulip
Open-source team chat with unique topic-based threading
Alternative to: slack, microsoft teams, discord
12.1
2026-06-26Zulip Server 12.1 introduces improved search functionality, new administrative tools for organization management, and various stability and performance enhancements.
12.0
2026-04-27Zulip 12.0 introduces a redesigned mobile app experience, improved performance for large streams, and various usability enhancements.
12.0-beta2
2026-04-26Zulip 12.0-beta2 introduces improved performance, new UI enhancements, and various bug fixes across the server and web application.
11.6
2026-03-31Zulip Server 11.6 introduces support for the new 'Topics' UI, enhances search capabilities, and includes various performance improvements and bug fixes.
12.0-beta1
2026-03-12Zulip Server 12.0 beta1 introduces a new navigation sidebar, enhances message linking, and updates several core dependencies.
11.5
2026-02-05Zulip 11.5 introduces enhanced search functionality, improved UI components for message editing, and various performance optimizations across the server.
11.4
2025-10-23Zulip 11.4 introduces a new layout for the message list, improved search functionality, and various performance optimizations.
11.3
2025-10-22Zulip Server 11.3 introduces an improved user profile page and various performance and usability enhancements.
11.2
2025-09-16Zulip Server 11.2 introduces a new 'All Messages' view for streams and enhances the user interface for stream management and profile settings.
11.1
2025-09-11Zulip 11.1 introduces new organizational tools, including a refined user administration interface, improved search capabilities, and various performance optimizations.
11.0
2025-08-13Zulip Server 11.0 introduces a revamped user profile experience, improved search functionality, and various performance and security enhancements.
11.0-beta2
2025-07-30Zulip Server 11.0-beta2 introduces the new 'Organization' settings page and various bug fixes and performance improvements.
11.0-beta1
2025-07-17Zulip Server 11.0 beta1 introduces various improvements, enhancements, and bug fixes across the server and client.
10.4
2025-07-02Zulip 10.4 introduces the ability to rename organizations, enhanced search functionality, and various performance improvements.
10.3
2025-05-15Zulip Server 10.3 introduces the ability to search for messages across all streams and updates various UI elements for improved user experience.
10.2
2025-04-16Zulip 10.2 introduces a redesigned messages view, improved search capabilities, and various performance enhancements and bug fixes.
10.1
2025-03-29Zulip 10.1 introduces a new layout for the message list, enhanced search capabilities, and various performance improvements.
10.0
2025-03-20Zulip 10.0 introduces a new server architecture and significant internal refactoring to improve performance and maintainability.
10.0-beta2
2025-03-07Zulip Server 10.0 beta 2 includes various bug fixes, performance improvements, and refinements to the new user interface.
10.0-beta1
2025-03-01Zulip 10.0.beta1 introduces several performance improvements, bug fixes, and updated dependencies for the server.
9.4
2025-01-16Zulip 9.4 introduces support for external authentication via OIDC, improved search functionality, and various performance enhancements.
9.3
2024-11-23Zulip 9.3 introduces a new stream-based message organization system, improved search functionality, and various performance optimizations.
9.2
2024-09-12Zulip 9.2 introduces improved search functionality, new UI enhancements for organization management, and various bug fixes.
9.1
2024-08-02Zulip 9.1 introduces improved message threading, enhanced search capabilities, and various performance optimizations for the server and client.
8.5
2024-08-01Zulip 8.5 introduces several new features and performance improvements, including a new 'Recent' tab for conversations and enhanced search capabilities.
9.0
2024-07-25Zulip 9.0 introduces a new user interface layout, enhanced search capabilities, and various performance optimizations.
9.0-beta1
2024-07-18Zulip 9.0 Beta 1 introduces a redesigned user interface, improved performance, and new moderation tools.
8.4
2024-05-09Zulip 8.4 introduces several performance improvements and new features for enhancing server administration and user collaboration.
8.3
2024-03-19Zulip 8.3 introduces several improvements to the user interface and server-side performance, along with various bug fixes.
8.2
2024-02-16Zulip 8.2 introduces the new 'Topics' experience for streamlined conversation management, alongside various performance improvements and bug fixes.
8.1
2024-01-25Zulip 8.1 introduces improved search performance, a new 'pinned' messages feature for streams, and various UI refinements to enhance the user experience.
8.0
2023-12-15Zulip 8.0 introduces a redesigned server architecture, enhanced search capabilities, and various performance improvements to the user interface.
8.0-beta2
2023-12-12Zulip 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
2023-11-17Zulip 8.0 beta 1 introduces several performance improvements, UI refinements, and bug fixes for the server and web app.
7.5
2023-11-16Zulip 7.5 introduces a new simplified layout for the message composer and improves the performance of the search interface.
7.4
2023-09-16Zulip 7.4 introduces a new 'pinned messages' feature for streams and topics, along with various performance improvements and bug fixes.
7.3
2023-08-25Zulip 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
2023-07-05This 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
2023-06-13This 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
2023-05-31Version 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
2023-05-29This release introduces a major visual redesign, new compose box features, JWT authentication, and support for Debian 12 and Postgres 15.
6.2
2023-05-19This 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
2023-05-11This 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
2023-05-03Zulip 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
2023-01-23This release includes numerous bug fixes for the web app and desktop client, documentation updates, and improvements to the installation and import processes.
6.0
2022-11-17Version 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
2022-11-16This 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
2022-11-03Release of Zulip Server 6.0-rc1, a release candidate for the version 6.0 milestone.
6.0-beta1
2022-10-13Zulip Server 6.0-beta1 introduces initial beta features and stability improvements for the upcoming 6.0 release.
5.6
2022-08-24This release addresses security vulnerabilities CVE-2022-36048 and CVE-2022-35962, hardens authentication checks, and updates documentation and dependencies.
5.5
2022-07-22Fixed a security vulnerability regarding bot role authorization, improved the restore-backup tool, and updated translations.
5.4
2022-07-12This 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
2022-06-21This release fixes a security vulnerability regarding message edit exposure, upgrades Tornado to version 6, and optimizes the server upgrade process.
5.2
2022-05-04This 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
2022-04-02This release includes various bug fixes for upgrades, Slack imports, LXC installations, and UI improvements, alongside updated translations.
5.0
2022-03-29Zulip 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
2022-03-255.0-rc1
2022-03-16Release candidate for Zulip Server 5.0, introducing new features and improvements.
4.11
2022-03-15Fixed a race condition that could allow deactivated users continued access and updated translations.
4.10
2022-02-25This 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
2022-01-25This release addresses a critical RabbitMQ vulnerability, fixes various bugs related to Camo image proxy and database corruption, and updates system configuration requirements.
4.8
2021-12-01This 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
2021-10-04Fixed a regular expression denial-of-service vulnerability in linkifier patterns that could be exploited by organization administrators.
4.6
2021-09-23Version 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
2021-08-12Fixed a potential database migration failure in 0257_fix_has_link_attribute.py to prevent errors during the upgrade process.
4.5
2021-07-25Added a tool to fix database corruption caused by host OS upgrades.
4.4
2021-07-22This 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
2021-06-02This release includes various bug fixes for Jitsi, GIPHY, and Dropbox integrations, as well as improvements to Grafana formatting and storage backend support.
4.2
2021-05-14Fixes issues with purge-old-deployments during Git upgrades and installation from root-only directories.
4.1
2021-05-14Fixed an exception encountered when upgrading from older releases to the 4.x series.
4.0
2021-05-13Version 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
2021-05-04This is the first release candidate for Zulip Server 4.0.
3.4
2021-04-14This release addresses several security vulnerabilities (CVEs), fixes HTML injection and email configuration bugs, and adds support for modern desktop application logout events.
3.3
2020-12-01This update fixes stream posting permissions, resolves outgoing mail issues, improves the PostgreSQL upgrade tool, and renames the user role management command.
3.2
2020-09-15Updates include switching to python-binary-memcached, removing a problematic dependency, improving email security and validation, and fixing various search and configuration bugs.
3.1
2020-07-30This 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
2020-07-16Version 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
2020-07-022.1.7
2020-06-26Fixes a privilege escalation vulnerability and updates the default memcached authentication username.
2.1.6
2020-06-17Fixed a Python 3.6+ syntax issue that prevented installation on Ubuntu Xenial.
2.1.5
2020-06-17This release addresses multiple security vulnerabilities including XSS and tabnapping, fixes database migration bugs, and improves Slack import stability.
2.1.4
2020-04-16This 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
2020-04-01This 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
2020-01-16This 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
2019-12-14Fixed LDAP integration upgrade issues, reimplemented a Postgres installer option for DBaaS support, and improved documentation.
2.1.0
2019-12-13This release adds SAML authentication, Mattermost import, and Debian buster support, while improving the email gateway and redesigning email notifications.
2.0.8
2019-12-13Fixed a security vulnerability (CVE-2019-19775) relating to an open redirect in the thumbnail view.
2.1.0-rc1
2019-11-22This is a release candidate for Zulip server version 2.1.0.
2.0.7
2019-11-21Fixed an insecure account creation vulnerability via social authentication and added backend enforcement for zxcvbn password strength checks.
2.0.6
2019-09-23Updates signing keys for Debian Stretch and fixes bugs related to URL linkifiers and message list scrolling.
2.0.5
2019-09-23This 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
2019-06-07This 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
2019-04-23This 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
2019-03-15This release includes various bug fixes for S3 uploads, LDAP synchronization, UI elements, and updated translations.
2.0.1
2019-03-05This 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
2019-03-05This 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
2019-02-141.9.1
2018-11-30This 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
2018-11-07Version 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.