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APPLIES TO: SDK v4
The Bot Framework SDKs for C#, JavaScript, Python, and Java are an Open Source SDK that enables developers to model and build sophisticated conversations using C#, Java, JavaScript, or Python.
For release notes for each version, see the C# releases, JavaScript releases, Python release, and Java releases pages.
Note
To build agents with your choice of AI services, orchestration, and knowledge, consider using the Microsoft 365 Agents SDK. The Agents SDK has support for C#, JavaScript or Python. You can learn more about the Agents SDK at aka.ms/agents. If you're looking for a SaaS-based agent platform, consider Microsoft Copilot Studio. If you have an existing bot built with the Bot Framework SDK, you can update your bot to the Agents SDK. You can review the core changes and updates at Bot Framework SDK to Agents SDK migration guidance. Support tickets for the Bot Framework SDK will no longer be serviced as of December 31, 2025.