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when you first open the "Source SDK" (AppID 211) launcher, please note that the standalone Source SDK tool/launcher are no longer updated, and does not support Source 2013 and Team Fortress 2 branch games.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Note:The latest release note on Steam News page is no longer updated.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. It is also recommend that you visit Source SDK 2013 GitHub page and view recent changes there, as this page may not be up to date.

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.