●Change8

Migrating to Chainlit 2.6.6

Version 2.6.6 introduces 1 breaking change. This guide details how to update your code.

Released: 8/5/2025

1
Breaking Changes
1
Migration Steps
4
Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

CHAINLIT_COOKIE_PATHCHAINLIT_AUTH_COOKIE_PATHCHAINLIT_ROOT_PATHCopilot widget configuration

Breaking Changes

●Issue #1

The environment variable for authentication cookies has been renamed from `CHAINLIT_COOKIE_PATH` to `CHAINLIT_AUTH_COOKIE_PATH`. Update any environment variable usage accordingly.

Migration Steps

  1. 1
    If you were using the environment variable `CHAINLIT_COOKIE_PATH`, rename it to `CHAINLIT_AUTH_COOKIE_PATH` in your environment setup.

Release Summary

This release introduces support for Slack emoji reactions, adds a language parameter to the Copilot widget, and fixes an issue where user-provided HTML was incorrectly rendered.

Need More Details?

View the full release notes and all changes for Chainlit 2.6.6.

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