Source SDK Release Notes

Important:If you see this page when you first open the "Source SDK" (AppID 211) launcher, please note that the standalone Source SDK tool/launcher are no longer updated, and does not support Source 2013 and Team Fortress 2 branch games. The deprecated Source SDK tools are provided to create content-based mods for Source 2009 or earlier, and to obtain source code & create mods for Source SDK Base 2006 and Source SDK Base 2007.

Many Source 2013 and Team Fortress 2 branch games usually shipped with Source SDK preinstalled. To launch the SDK applications (Hammer, HLMV, etc...) manually on Source 2013 games, see SDK Installation - SteamPipe migration section.

Note:The latest release note on Steam News page is no longer updated. Instead release note and changes below are copied from source-sdk-2013 GitHub Commits history.

Source SDK 2013 update (5/14/2025)

Multiplayer (Team Fortress 2 branch)

Code updates

Sync latest code from Team Fortress 2.

View changes (Code, Changelog).

Updated source code (as of 6/18/2025)

• Source 2013 Singleplayer: Source SDK 2013 GitHub repo.
  • Note:SP code remains unchanged since 2014.
• TF2 branch (newer Source 2013 MP): Source SDK 2013 GitHub repo.

Report Issues

• If you encounter any problems with this release (bugs, crashes, etc...), visit GitHub Issues page to report or search existing issues:
  • Source 1 Games repo - find / report bugs that affecting Valve games.
  • Source SDK 2013 repo - find / report bugs affecting the Source SDK itself, and Source SDK Base 2013.
  • Important:Always search for existing issues before creating new bug report, to prevent duplicated bug reports.

Previous releases

• See the Source SDK release notes archive for information on previous releases.